Operating Manual HB511020, Rev. A November 2007 Micro Motion® 7951 Signal Converter 7951 Signal Converter (With gas software 1020) Micro Motion® 7951 Introduction: The Micro Motion® 7951 Signal Converter can be used for dual-channel/stream gas applications. Software Version: 1020 – Gas Applications.
Copyright © 1997 - 2007 Micro Motion, Inc. pursues a policy of continuous development and product improvement. The information contained in this document is, therefore, subject to change without notice. To the best of our knowledge, the information contained in this document is accurate. However, Micro Motion cannot be held responsible for any errors, omissions or inaccuracies, or any losses incurred as result of them.
Static precautions Some parts of the instrument (such as circuit boards) may be damaged by static electricity. Therefore, when carrying out any work which involves the risk of static damage to the instrument, the instructions show the following notice: CAUTION While carrying out this procedure, you must wear an earthed wrist strap at all times to protect the instrument against static shock. At such times you must wear an earthed wrist-strap to protect the instrument.
CONTENTS 1. About this manual 1.1 1.1 1.2 1.3 What this manual tells you Who should use this manual Software versions covered by this manual 1.1 1.1 1.1 2. Getting started 2.1 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.
.7 5.8 5.9 5.10 Step 4: Step 5: Step 6: Step 7: Fitting the 7951 Making the external connections Earthing the instrument Connecting the power supply 6. The keyboard, display and indicators 6.1 6.1 6.2 6.3 6.4 6.5 6.6 6.7 What this chapter tells you The layout of the front panel What the display shows How the buttons work Using the buttons to move around the menus Using the buttons to view stored data Using the buttons to edit information 6.7.1 Text editing 6.7.2 Multiple-choice option selection 6.7.
9.5 9.6 9.7 Analogue 0% and 100% values Live and set data Units which the 7951 can display 9.2 9.2 9.3 10. Configuring the instrument using wizards 10.1 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 10.11 10.12 10.13 10.14 10.15 10.16 10.17 10.18 10.19 10.20 10.21 10.
12. Routine operation 12.1 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 12.9 12.10 12.11 What this chapter tells you The menu diagrams Security and passwords How you can edit displayed information Making data values Live or Set Changing the units which are displayed Changing fallback values Changing the time and date Checking the performance of the 7951 Giving your 7951 a unique identifier Printed reports 12.1 12.1 12.8 12.8 12.10 12.11 12.11 12.11 12.11 12.12 12.12 13.
Appendix D Units and conversion factors D.1 Appendix E Data tables E.1 Appendix F Calculations and theory F.
Chapter 1 About this manual 1. About this manual 1.1 What this manual tells you This manual tells you how to install, configure, operate, and service the instrument. In addition, some information is given to help you identify and correct some of the more common faults which may occur. However, since repairs are done by changing suspected faulty assemblies, fault-finding to board component level is not covered.
Chapter 1 About this manual Page 1.
Chapter 2 Getting started 2. Getting started 2.1 What this chapter tells you ® If you are new to the Micro Motion 7951 Signal Converter, the worked examples in this chapter can help you to become familiar with the installation and configuration procedures. The examples are: x Example 1: 7951 with a 7810/11/12 (See page 2.2) x Example 2: 7951 with a 3096/3098 Gas Specific Gravity (See page 2.6) x Example 3: 7951 with a mA-type temperature transmitter (See page 2.
Chapter 2 Getting started 2.4 Example 1: 7951 with a 7810/11/12 gas density meter About this example This NON-HAZARDOUS (SAFE) AREA ONLY INSTALLATION† example shows you how to connect either a 7810, 7811 or 7812 gas density meter to the 7951, and then uses the “Density 1” wizard to configure the system. In this example, the “Density 1” wizard is used to configure a connection as follows: x A single densitometer is connected to Density Input 1.
Chapter 2 Getting started 7812 7951 1 +24V Power SIG A 2 3 Signal + SIG B 4 0V Power Signal - Klippon D-type PL5/9 SK6/22 PL5/1 SK6/14 PL5/10 SK6/24 PL5/2 SK6/15 Figure 2.2: Safe area wiring for a 7812 (3-wire arrangement) Turn on the power 3. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear. 4.
Chapter 2 Getting started Figure 2.3: Prime Line density display C A L I B R A T I O N C E R T I F I C A T E Serial No: 123456 Cylinder No: 123456 Amplifier No: 123456 Calibration Date: 14JUL97 7812xx GAS DENSITY METER PRESSURE TESTED TO 375 BAR DENSITY CALIBRATION FOR NITRIGEN AT 20 DEG C Based on Pressure-Temperature-Density Data in IUPAC Tables L P DENSITY = K0 +K1.T + K2.T**2 X E TEMPERATURE COEFFICIENT DATA K18 = -1.36E-05 K19 = 8.
Chapter 2 Getting started View the Multiview display 26. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.5, although values shown may vary. 27. Pressing the DOWN-ARROW button results in the message: “Invalid Multiview Page” This appears because it is possible to have more than one Multiview page and it is simply saying that no more pages exist. In this case, only four items are defined and they fit on one page.
Chapter 2 Getting started 2.5 Example 2: 7951 with a 3096/3098 Gas Specific Gravity Meter About this example This example shows you how to connect a 3096/3098 to the 7951 and then use the “SG 1” wizard to configure the system. In this example, the “SG 1” wizard is used to configure a connection as follows: x A single 3096/3098 is connected to Density Input 3. Work through the example by following the instructions below. If you are not sure where the buttons are, refer to Chapter 6. Connect the meter 1.
Chapter 2 Getting started Barrier as defined in the latest 3096/3098 specification 3096/3098 1 2 3 + Sig 3 1 4 2 7951 Klippon D-type PL5/9 SK6/22 PL5/5 SK6/18 PL5/6 SK6/19 PL5/10 SK6/24 (24v) Power + Signal + Neg Signal (0v) Power Intrinsically Safe Earth Figure 2.7: Hazardous area wiring for a 3096/3098 Turn on the power 3. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds.
Chapter 2 Getting started Figure 2.8: Prime Specific Gravity display View the Multiview display 22. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.9, although values and titles shown may vary. From Multi-view key Density 0.000 a b c V d Invalid Multiview Page a b c V d Figure 2.9: Multi-View display End of Worked Example 2 Page 2.
Chapter 2 Getting started 2.6 Example 3: 7951 with a mA-type temperature transmitter About this example This example shows you how to connect a mA-type temperature transmitter to the 7951, and then use the “Temperature” wizard to configure the system. In this example, the “Temperature” wizard is used to configure connections as follows: x A single temperature transmitter is connected to Analogue Input 3. Now work through the example by following the instructions below.
Chapter 2 Getting started Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear. 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already). Go to the wizards menu 6. Press the DOWN-ARROW button twice to go to Page 3 of the menu. 7. Press the b-button to select “Configure”. 8.
Chapter 2 Getting started Figure 2.11: Line temperature data display End of Worked Example 3 Page 2.
Chapter 2 Getting started 2.7 Example 4: 7951 with a mA-type pressure transmitter About this example This example shows you how to connect a mA-type pressure transmitter to the 7951, and then use the “Pressure” wizard to configure the system. In this example, the “Pressure” wizard is used to configure a connection as follows: x A single pressure transmitter is connected to Analogue Input 3. Work through the example by following the instructions below.
Chapter 2 Getting started Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear. Go to the wizards menu 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already). 6. Press the DOWN-ARROW button twice to go to Page 3 of the menu. 7. Press the b-button to select “Configure”. 8.
Chapter 2 Getting started 2.8 Example 5: 7951 with a PRT-type temperature transmitter About this example This example shows you how to connect a PT100 transmitter to the 7951, and then use the “Temperature” wizard to configure the system. In this example, the “Temperature” wizard is used to configure a connection as follows: x A single PT100 transmitter is connected to Analogue Input 1. Work through the example by following the instructions below.
Chapter 2 Getting started Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear. Go to the wizards menu 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already). 6. Press the DOWN-ARROW button twice to go to Page 3 of the menu. 7. Press the b-button to select “Configure”. 8.
Chapter 2 Getting started Page 2.
Chapter 3 About the Micro Motion® 7951 3. About the Micro Motion® 7951 3.1 Background The Micro Motion® 7951 is designed to meet the demand for a reliable, versatile, user-friendly and cost-effective instrument for liquid and gas metering. It has a Motorola 68332 32-bit microprocessor and surface-mounted circuit board components so that it is powerful, reliable and compact. Features of the 7951 include: • Simple access to information. • Comprehensive interrogation facilities.
Chapter 3 About the Micro Motion® 7951 3.3 Physical description of the 7951 The main body of the 7951 is a one-piece aluminium extrusion which provides the best possible EMC protection. The keyboard and display is attached to the front of the instrument and all electrical and communications connectors are mounted on the Rear Panel. The 7951 is available with two types of rear Panel - one with Klippon connectors, the other with D-type connectors. The case contains four circuit boards.
Chapter 3 About the Micro Motion® 7951 3.5 Typical installations The diagram below illustrates a typical installation utilising the 7951. Part of pipeline Transducers and transmitters TE DT PT PT DT TE 4-wire PRT Static pressure transducer Density transmitter Temperature element (PRT) 7951 Alarm Analogue outputs Frequency 4-20mA Printer MODBUS communications to and from host computer Figure 3.2: Typical installation for A Gas Signal Converter system 3.
Chapter 3 About the Micro Motion® 7951 For example, for a 7951 Dual-Channel Gas Signal Converter, the software version number is 511020. You can find the software version number in two ways: 1. It is printed on a label at the rear panel of the 7951. 2. It is written into the menu structure – see Chapter 12. Page 3.
Chapter 4 What you can connect to a 7951 4. What you can connect to a 7951 The information in this chapter has been moved to Appendix C. Page 4.
Chapter 4 What you can connect to a 7951 Page 4.
Chapter 5 Installing the system 5. Installing the system 5.1 What this chapter tells you This chapter gives full instructions for installing the 7951. It does not go into detail about how to install any peripheral devices (such as transducers, computers or printers) which are connected to the 7951. For this information you must refer to the documentation supplied with these items. 5.
Chapter 5 Installing the system 5.5 Step 2: Unpacking the instrument Remove the instrument from its packing and examine it to see if any items are loose or if it has been damaged in transit. Check that all items on the shipping list are present. If any items are missing or if the equipment is damaged, contact your supplier immediately for further advice. Note: If you have ordered an option card, this is already installed in the 7951. Table 5.
Chapter 5 Installing the system 5.6 Step 3: Setting DIP-switches Some types of connection may require DIP-switches to be set. 5.6.1 Analogue Input DP-switches The 7951 has two blocks of DIP-switches on the Processor Board, as shown in Figure 5.1: x SW1 switches – select whether each input is 4-20 mA or PRT. x SW2 switches – not used in the current version of 7951. The setting of each switch in the SW2 block must be the same as the corresponding pair of switches in the SW1 block.
Chapter 5 Installing the system 5.7 Step 4: Fitting the 7951 Caution: You must not fit the 7951 where it may be subjected to extreme conditions or be liable to damage. For further information about the environmental conditions within which it can operate, see Appendix C. 1. Firstly, referring to Figure 5.2, cut out an aperture in the front panel for each instrument which is to be mounted on it.
Chapter 5 Installing the system You can mount the clamp so that it is fixed permanently or can be removed later, if required. If you want the clamp to be fixed permanently, carry out Steps 3 - 8. If you want to be able to remove the clamp, carry out Steps 9 - 12. If the clamp is to be fixed permanently: 1. Make sure that the face of the front panel is in good condition and has no loose or flaking paint. Use a suitable de-greasing agent to clean the face of the panel. 2.
Chapter 5 Installing the system 5.8 Step 5: Making the external connections 1. Refer to the documentation supplied with the external equipment to see if you have to carry out any special procedures when connecting them to the 7951. Take special notice of any information about safety requirements in hazardous areas, and complying with EMC regulations. 2. For each D-type connector, pass the connector hood over the cable and wire up the connector.
Chapter 5 Installing the system OK 7951 7951 7951 7951 7951 7951 7951 7951 2 2 7951 SK3 PL1 1 (1) Earth stud on 7951 rear panel (D-type and Klippon). (2) Cabinet earth or other suitable metal structure. Figure 4.7: Multiple 7951 chassis earthing (through studs and earth leads) Page 5.
Chapter 5 Installing the system 5.10 Step 7: Connecting the power supply Plug the dc power connector into plug PL1 and switch on the power. The instrument goes through the following Power-On-Self-Test (POST) routine: x The display shows a sequence of characters or patterns to prove that all elements of the display are working. There is a pause of five seconds between each change of pattern. x The program ROM is checked against a checksum. The display shows how the test is proceeding.
Chapter 6 The keyboard, display and indicators 6. The keyboard, display and indicators 6.1 What this chapter tells you This chapter tells you: • How the front panel is laid out. • What the buttons and indicators do. • What characters you can display. 6.2 The layout of the front panel Figure 6.1 shows the layout of the keyboard. The diagrams at the end of this chapter give a visual summary of what each of the buttons do. 1. DOWN-ARROW 7. ENTER 13. PRINT MENU 2. UP-ARROW 8.
Chapter 6 The keyboard, display and indicators 6.3 What the display shows The display can show the following information: • Numerical data in floating point, exponent or integer formats. • Text descriptors. • Units of measurement (if applicable). • Status of parameters i.e. set, live, failed or fallback (if applicable). • Alarm and event information. • Current time and date. • Identification number (location ID) of parameter. • Stream (metering-run) identification number (if applicable). 6.
Chapter 6 The keyboard, display and indicators MAIN MENU Moves you straight to page 1 of the top-level menu. INFORMATION MENU Takes you to a special menu providing information on alarms, events, flow status and 795x operating mode. PRINT MENU Takes you to a special menu dealing with data archiving and printing of reports. MULTI-VIEW You can define one or more display pages, each showing up to four items of data, lines of descriptive text, or both.
Chapter 6 The keyboard, display and indicators In VIEW mode, the buttons that you can use are: ‘a’ button On/off toggle for displaying the parameter’s unique identification number (location ID). This is displayed to the left of the status indication on line 4. ‘b’ button Puts the 795x into EDIT mode so that you can edit the data on line 2. The data being edited is left justified whilst in EDIT mode.
Chapter 6 The keyboard, display and indicators ENTER If you are satisfied with the changes you have made, press ENTER to accept the changes and go back to VIEW mode. (The ‘b’ also does this.) CLEAR This clears a line of text. BACK If you do not want to keep the changes you have made, press the BACK button to abandon the changes and go back to VIEW mode. PLUS / MINUS Toggles between lower and upper case letters. 6.7.
Chapter 6 The keyboard, display and indicators DOT Inserts a decimal point. EXPONENT Use this button if you want to show numbers in exponent form. ‘b’ button If you want to accept the changes you have made, press the ‘b’. The 795x will then revert to VIEW mode. (Note: ENTER also does this.) ENTER If you want to accept the changes you have made, press the ENTER key. The 795x will then revert to VIEW mode. (Note: ‘b’ also does this.) CLEAR Clears the line you are currently editing.
Chapter 6 The keyboard, display and indicators 6.8 The 795x character set You can use any of the 96 characters shown below as part of your display. Figure 6.3: The 795x character set 6.9 LED indicators Security Indicator This LED shows the present security level of the system. • • • • RED FLASHING RED ORANGE GREEN – The instrument is at Calibration level. – Engineer level: the instrument can be configured. – Operator level: limits can be changed. – World level: no parameters can be changed.
Chapter 6 The keyboard, display and indicators 6.10 Summary of button functions The tables here provide a visual summary of the function for each button when in various modes. Table 6.1: Summary of what the buttons do (Part 1 of 2) Page 6.
Chapter 6 The keyboard, display and indicators Table 6.2: Summary of what the buttons do (Part 2 of 2) Page 6.
Chapter 6 The keyboard, display and indicators Page 6.
Chapter 7 The menu system 7. The menu system 7.1 What this chapter tells you Before you can configure and operate the 795x, you should have some understanding of how the menu system works. The menus are simple and intuitive, so they should present no problems to the average user. This chapter gives you a general tour, showing how to navigate the menu system to find application parameter screens and other types of screen such as for entering passwords.
Chapter 7 The menu system Each menu choice is associated with a lettered button on the front panel - a, b, c or d. For example, a menu choice on Display Line 1 is associated with the a button. Similarly, a menu choice on Display Line 2 is associated with the b button, and so on. If there is no menu choice on a display line, the associated letter button will not do anything.
Chapter 7 The menu system At the lowest levels in each branch of the menu system, there are parameter screens. Figure 7.4 shows how to navigate to the parameter screen for . All parameter screens feature a solid, black, triangular shaped mark in the bottom-left corner of Display Line 4. Note: Full details about editing parameters can be found in Chapter 6. Note: The menus may be different in your software. Figure 7.4: A typical software parameter screen Page 7.
Chapter 7 The menu system Returning to the top-level menu again, there are menu choices that are common to all software versions (Figure 7.5). In addition, you’ll encounter them in subsequent chapters. All other menu choices on the Main Menu (e.g. “Flow rates”) are for operators to quickly find final measurements and other calculation results. Chapter 12 has tables showing these menus in more detail. Leads to menus for viewing interim results of measurements and other calculations, Inputs, Outputs, etc.
Chapter 8 Alarms 8. Alarms 8.1 Alarms 8.1.1 Alarm types The types of alarms that are detected and recorded are: System alarms, caused by one or more of: • Power failure. • Battery low (if a battery is fitted). • Watchdog. • RAM checksum failure. • ROM checksum failure. Input alarms, caused by one or more of: • Failure of analogue inputs. • Failure of density transducers. • Incorrect data has been entered. Limit alarms, caused by one or more of: • Limits which you have set. • Limits defined by the system.
Chapter 8 Alarms 8.1.3 How alarms are received and stored When a new alarm is received, the appropriate indicator LED on the front panel starts flashing. If the indicator is already flashing because of a previous alarm, it continues to do so. If the indicator is already ON (steady), it starts to flash. Information about alarms is stored in two logs: • The Alarm Status Display This gives: (1) a summary of the contents of the Historical Alarm Log (2) an indication of the current status of the system.
Chapter 8 Alarms 8.1.5 What the Alarm Status Display tells you A typical Alarm Status Display is shown in Figure 8.2. The display lists, for each type of alarm (System, Input or Limit), the number of alarms that are live and new. • • New alarms are alarms that have been received but not accepted. Live alarms are alarms that refer to conditions still active. An example of a live alarm is when there is a fault in the system.
Chapter 8 Alarms • Acceptance indication This is only shown for those entries that have not been accepted. When the entry is accepted, the indicator disappears. • Other entries indication An up-arrow symbol shows that there are entries before the present one, whilst a down-arrow symbol shows that there are others after. If the entry currently shown is first in the list, there is no up-arrow. If it is last, there is no down-arrow.
Chapter 8 Alarms Comparison limit of density ‘A’ and ‘B’ measurements exceeded Dens comp. limit Limit Additional alarm message letters: ‘L’=Line density, ‘B’=Base density Dens temp A limit Limit [H]igh, [L]ow or [S]tep limit for DensityA temperature exceeded Dens temp B limit Limit [H]igh, [L]ow or [S]tep limit for DensityB temperature exceeded Density cal fail System A particular density input has not been calibrated. Additional character seen is the channel number.
Chapter 8 Alarms Page 8.
Chapter 9 Additional facilities 9. Additional facilities 9.1 What this chapter tells you You can also specify features such as: • Fallback values and modes to be used if live inputs fail. • Limits which, if exceeded, trigger alarms. • The units in which the calculations are performed and are displayed. The following sections give more information about these, and other, topics which relate to the way in which data is processed. 9.
Chapter 9 Additional facilities 9.4 Fallback values and modes A fallback value is used as a temporary substitute for a parameter if a live input (i.e., the transducer, transmitter or wiring), which is normally used to calculate the parameter, should fail. A fallback must have one of the following modes: • None The system uses whatever value is available for the parameter regardless of whether or not the live input has failed.
Chapter 9 Additional facilities 9.7 Units which the 795x can display The 795x can display data values with many different units, as listed in Table 9.1 below. However, when communicating with other devices, the data is always sent using the standard units. In Table 9.1, the following definitions are used: • Standard units: Units which the 795x displays unless you choose an alternative. • Other units: Units which you can choose instead of the standard.
Chapter 9 Additional facilities Page 9.
Chapter 10 Configuring your instrument by using wizards 10. Configuring your instrument by using wizards 10.1 What this chapter tells you This chapter features complete maps of all the configuration wizards. Each map shows all the possible routes through a wizard. 10.2 Wizards: Configuring the easy way Wizards are configuration tools which are written into the instrument’s software.
Chapter 10 Configuring your instrument by using wizards Setup wizard Wizard 'b' key This represents the selection of the wizard. It is the start point for every wizard. Pressing the 'b' key or the enter key confirms the selection. An arrow indicates where a wizard will continue to. It may (or may not) have a label to identify a particular path the wizard is taking Heading "Option n" "Option 1" Option 1 Option 2 Option n "Option 2" This format indicates a situation where there are two or more options.
Chapter 10 Configuring your instrument by using wizards 10.4 Quick-start Guide ( Set-up Wizards ) Wizard Measurement Task Page Density 1 • Gas density measurement (nominated as density ‘A’) from a single transducer that is connected to “Density input 1”. 10.6 Density 2 • Gas density measurement (nominated as density ‘B’) from a single transducer that is connected to “Density input 1”. 10.
Chapter 10 Configuring your instrument by using wizards 10.5 Set-up Wizard Selection Map After using the menu to arrive at the wizard sub-menu, as shown earlier in Figure 10.1, a wizard option can be chosen. Selection Procedure 1. Press the b-button to begin the selection process. 2. Use the up/down arrow buttons to cycle through all the available wizard options. 3. Press either the b-button or the enter button to select the wizard option that presently appears on the 795x display. 4.
Chapter 10 Configuring your instrument by using wizards 10.6 Units Wizard Selection Map After using the menu to arrive at the units wizard sub-menu, as shown earlier in Figure 10.1, a wizard option can be chosen. Selection Procedure 1. Press the b-button to begin the selection process. 2. Use the UP/DOWN ARROW buttons to cycle through all the available unit wizard options. 3. Press either the b-button or the ENTER button to select the unit wizard option that presently appears on the 795x display.
Chapter 10 Configuring your instrument by using wizards 10.7 Density 1 application wizard Setup wizard Density 1 'b' key Edit Gas density A? "Yes" Transducer A K0 No Yes Transducer A K1 "No" Transducer A K2 Edit Dens.Temp.
Chapter 10 Configuring your instrument by using wizards Temperature & VOS Correction Sequences From "Part 1" A1 page Line dens A VOS type (Selection) Density A corrections (Selection) P method None SG method Temp and VOS VOS VOS Density Transducer A (Selection) Temp "None" "Temp" 7812 N2 high Transducer A K18 7812 N2 low Transducer A K19 7811 AR high Density A offset 7811 N2 high Route returns to : "Edit Density Limits & Fallback " prompt (on previous page) unless VOS correction has also
Chapter 10 Configuring your instrument by using wizards 10.8 Density 2 application wizard Setup wizard Density 2 'b' key Edit Gas density B? "Yes" Transducer B K0 No Yes Transducer B K1 "No" Transducer B K2 Edit Dens.Temp.
Chapter 10 Configuring your instrument by using wizards Temperature & VOS Correction Sequences From "Part 1" A1 page Line dens B VOS type (Selection) Density B corrections (Selection) P method None SG method Temp and VOS VOS VOS Density Transducer A (Selection) Temp "None" "Temp" 7812 N2 high Transducer A K18 7812 N2 low Transducer A K19 7811 AR high Calibration Temp 7811 N2 high Density A offset 7811 N2 low Route returns to : "Edit Density B Limits & Fallback " prompt (on previous page
Chapter 10 Configuring your instrument by using wizards 10.9 SG-1 Application Wizard This wizard can be used to configure a system that has a 3096 gas specific gravity transducer connected to “Density input 3”. Special equations, analogue outputs, user alarms and multi-view can also be configured here.
Chapter 10 Configuring your instrument by using wizards 10.10 SG-2 Application Wizard This wizard can be used to configure a system that has a 3096 gas specific gravity transducer connected to “Density input 4”. Special equations, analogue outputs, user alarms and multi-view can also be configured here.
Chapter 10 Configuring your instrument by using wizards 10.11 SG-1&2 Application Wizard This wizard can be used to configure a system that has 3096 gas specific gravity transducers connected to “Density input 3” and “Density input 4”. Special equations, analogue outputs, user alarms and multi-view can also be configured here.
Chapter 10 Configuring your instrument by using wizards 10.12 Line density wizard This wizard configures the 795x for getting line density ‘A’ and/or line density ‘B’ data.
Chapter 10 Configuring your instrument by using wizards Sequence : Line density ‘B’ measurement A2 "PTZ1" Line density B selection? PTZ1 Time Period Analogue"Yes" input See "Part 1" page A3 "Time Period" Edit Line density B calc ? No Yes "No" A1 P method "Yes" "Analogue input" Edit Line density B analogue input ? No Yes "Yes" SG method Transducer B K0 "No" A1 Transducer B K1 See "Part 1" page Density Transducer B (Selection) Transducer B K2 7812 N2 high Density B correction (Selection)
Chapter 10 Configuring your instrument by using wizards Sequence : Line density ‘B’ measurement using PTZ1 method From A3 "Part 1" page Edit PTZ1 calculation ? No Yes See "Part 1" page A1 Route 1 Edit SGERG parameters ? No Yes "Yes" PTZ1 calc select (Selection) Route 3 "No" Edit Nx19-3H parameters? No Yes "Yes" "Yes" Live CO2 value SGERG selector (Selection) Live N2 value AGA-NX19 N2 CO2 Cv RD H2 Methane SGERG N2 CO2 Cv -- H2 Ethane AGA-NX19-mod3h N2 CO2 -- RD H2 Propane AGA-NX19-mo
Chapter 10 Configuring your instrument by using wizards 10.13 Base density wizard This wizard configures the 795x for getting base density ‘A’ and/or base density ‘B’ data.
Chapter 10 Configuring your instrument by using wizards Sequence : Base density ‘B’ measurement using the PTZ1 method From H2 "Part 1" page Edit PTZ1 calculation ? No Yes To "Part 1" page H1 Route 1 Edit SGERG parameters ? No Yes "Yes" PTZ1 calc select (Selection) Route 3 "No" Edit Nx19-3H parameters? No Yes "Yes" "Yes" Live CO2 value SGERG selector (Selection) Live N2 value AGA-NX19 N2 CO2 Cv RD H2 Methane SGERG N2 CO2 Cv -- H2 Ethane AGA-NX19-mod3h N2 CO2 -- RD H2 Propane AGA-NX19
Chapter 10 Configuring your instrument by using wizards 10.14 Specific gravity wizard This wizard configures the 795x for getting specific gravity ‘A’ and/or specific gravity ‘B’ data.
Chapter 10 Configuring your instrument by using wizards Sequence : Specific gravity ‘B’ measurement from an analogue input I1 From "Part 1" page Edit SG B analogue input ? No Yes "No" I2 Turn to "Part 1" page "Yes" SG B mA Src (Selection) mA input 1 mA input 2 mA input 10 SG @ 100% SG @ 0% Analogue input n type (Selection) PT100 input Note: 'n' is the number of the input channel selected earlier.
Chapter 10 Configuring your instrument by using wizards 10.15 Temperature wizard This wizard configures the 795x for getting line temperature ‘A’ and/or density temperature ‘A’ and/or density temperature ‘B’ data. Setup wizard Temperature From "Part 2" page From "Part 2" page J4 'b' key Edit Line Temperature ? No Yes "Yes" Edit Dens. Temp. A ? No Yes "No" "Yes" Line temp input chl (Selection) Analogue input 1 Analogue input 2 etc.
Chapter 10 Configuring your instrument by using wizards J1 From "Part 1" page Edit Temperature Limits & Fallback ? No Yes "Yes" From "Part 1" page J2 "No" J4 Turn to "Part 1" page Edit Dens. Temp. A Limits & Fallback ? No Yes "Yes" J3 "No" J5 Turn to "Part 1" page From "Part 1" page Edit Dens. Temp.
Chapter 10 Configuring your instrument by using wizards 10.16 Pressure wizard This wizard configures the 795x for getting line pressure and/or atmospheric pressure data.
Chapter 10 Configuring your instrument by using wizards Sequence : Atmospheric pressure from an analogue input K1 From "Part 2" page Edit Atmos. Pressure ? No Yes "No" Exit wizard "Yes" Edit Atmosp.
Chapter 10 Configuring your instrument by using wizards 10.17 Transmitter wizard This wizard configures the 795x for getting live CO2 and/or live N2 and/or live energy data.
Chapter 10 Configuring your instrument by using wizards Sequence : Live N2 from an analogue input From L1 "Part 1" page Live N2 input chl (Selection) mA input 1 Edit Live N2 Limits & Fallback ? No Yes mA input 2 mA input 10 "No" Exit wizard "Yes" Live N2 high limit Live N2 @100% Live N2 low limit Live N2 @ 0% Analogue input n type (Selection) Note: 'n' is the number of the input channel selected earlier PT100 input 0 - 20mA input 4 - 20mA input FB type DensLive tempN2 B Position (selection) (s
Chapter 10 Configuring your instrument by using wizards Sequence : Live energy value from an analogue input From L2 "Part 1" page Live energy input (Selection) mA input 1 Edit Live Cv/m Limits & Fallback ? No Yes mA input 2 mA input 10 "No" Exit wizard "Yes" Live energy @100% Live energy @ 0% Analogue input n type (Selection) Note: 'n' is the number of the input channel selected earlier PT100 input 0 - 20mA input 4 - 20mA input Live energy high lmt Live energy low lmt Live temp energy FB type Den
Chapter 10 Configuring your instrument by using wizards 10.18 Special Calculation wizard Setup wizard Special Calc. 'b' key Edit Special equation: "2" 1 2 "1" General equ. const A General equ2 const A General equ. const B General equ2 const B General equ. const X General equ2 const C General equ. const Y General equ2 ptr. t General equ. ptr. a User sp eq2 text (Free-form text) General equ. ptr. b General equ. ptr. c Exit wizard General equ. ptr. d General equ. ptr. e General equ. ptr.
Chapter 10 Configuring your instrument by using wizards 10.19 Analogue outputs wizard Setup wizard Analogue Outputs 'b' key Edit Analog output 1? No Yes "Yes" n=1 Note: 'n' is the number of the mA output being configured "No" Edit Analog output 2? No Yes Edit Analog output 8? No Yes etc. "No" "Yes" "Yes" n=2 mA output n source n=8 Note: This prompt needs the input of a location identifier e.g. 0450 mA n param. val. @100% mA n param. val.
Chapter 10 Configuring your instrument by using wizards 10.20 Alarms wizard Setup wizard Alarms 'b' key Edit User Alarm: X Y A B "B" "A" "Y" "X" User alarm X ptr. User alarm Y ptr. Comp alarm A ptr1 Comp alarm B ptr1 User alarm X low lmt User alarm Y low lmt Comp alarm A ptr2 Comp alarm B ptr2 User alarm X hi lmt User alarm Y hi lmt Comp alarm A limit Comp alarm B limit Exit wizard “Alarms” Wizard Map Page 10.
Chapter 10 Configuring your instrument by using wizards 10.
Chapter 10 Configuring your instrument by using wizards 10.22 Full Setup This wizard consists of multiple wizards. O1 Setup wizard Full Setup Edit Analog outputs? No Yes 'b' key Edit Line density ? "Yes" No Yes "No" Edit Base density ? No Yes Edit Specific gravity ? No Yes "Yes" "No" Edit Temperature ? No Yes "Yes" "No" Edit Pressure? "Yes" No Yes "No" Edit Energy ? "No" Route detours to the "Line density" wizard sequence before continuing from here.
Chapter 10 Configuring your instrument by using wizards Page 10.
Chapter 11 Configuring by using the menus 11. Configuring by using the menus The recommended way of configuring the 795x is by using wizards, as explained in Chapter 10. But you should use the methods given here if: x You want to configure an installation which is very different from the examples shown in Chapter 10. x You want to change only a part of an existing configuration, irrespective of how it was configured in the first place. x You are experienced in using the 795x menus. 11.
Chapter 11 Configuring by using the menus 11.3 Recommended sequence for configuration It is recommended that you configure items in the following order: 1. Inputs (See Section 11.5). 2. Transducer details (See Section 11.6). 3. Anything else such as Specific Gravity, Energy, Custom Application, Multiview, etc. Do these in the order in which they appear in this chapter. (See Sections 11.7- 11.18). Page 11.2 Item to be configured Calculations involved (if any) See Section Analogue inputs - 11.
Chapter 11 Configuring by using the menus 11.4 What Sections 11.5- 11.18 tell you Each section tells you how to configure one parameter. The format of each section is: x (Where necessary) a statement which tells you what information you must have to configure the parameter. x (Where necessary) a block diagram showing how the instrument uses information from the transducers (“Live Data”) and information you give it (“Fixed Data”) to calculate the value of the parameter.
Chapter 11 Configuring by using the menus S solartron SERIAL NO : CYLINDER NO : AMPLIFIER NO : CALIBRATION DATE : 78123A GAS DENSITY METER nnnnnn PRESSURE TESTED TO 375 BAR O DENSITY CALIBRATION FOR NITROGEN AT 20 DEG C (Based on Pressure-Temperature-Density Data in IUPAC tables) DENSITY [KG/M3] n nn nn nn nnn nnn nnn nnn nnn nnn PERIODIC TIME [uS] nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.nnn nnn.
Chapter 11 Configuring by using the menus 11.5 Configuring analogue inputs From Configure option on Main Menu V Wizards Analogue inputs Flowmeter details Transducer details a Analogue input 1 b b c d a V Analogue input 3 Analogue input 4 Analogue input 5 c d a Value Input type Average b V Analogue input 7 Analogue input 8 c Analogue input 9 a d V a b c d b c V d Figure 11.2 Menu structure for configuring analogue inputs 11.
Chapter 11 Configuring by using the menus 11.7 Configuring transmitter detail LIVE Input data PT100 or 4-20mA PRT Analogue input 1 Select source, value and status TEMPERATURE REFERRAL (Orifice only) CALCULATE TEMPERATURE A Analogue input 10 0% 100% Un-referred temp FIXED Input data Offset High Limits Low Step Referral select Fallback mode value RESULTS A TEMPERATURE OFFSET Line Temperature LIMITS FALLBACK ALARM (if limits are exceeded) Figure 11.
Chapter 11 Configuring by using the menus LIVE Input data PT100 or 4-20mA PRT Analogue input 1 Select source, value and status TEMPERATURE REFERRAL (Orifice only) CALCULATE TEMPERATURE A Analogue input 10 0% 100% Offset Tpos Un-referred temp FIXED Input data High Limits Low Step Fallback mode value RESULTS A TEMPERATURE OFFSET Temperature LIMITS FALLBACK ALARM (if limits are exceeded) Figure 11.
Chapter 11 Configuring by using the menus LIVE Input data FIXED Input data Values 0% 100% Limits High Low ALARM Fallbacks value mode (if limits are exceeded) 4-20 mA Analogue input 1 Analogue input 10 Select value and status RESULTS CALCULATE CO2 LIVE Input data LIMITS FALLBACK FIXED Input data Values 0% 100% Active CO 2 ALARM Limits High Low Fallbacks value mode LIMITS FALLBACK (if limits are exceeded) 4-20 mA Analogue input 1 Analogue input 10 Select value and status RESULTS CAL
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analog inputs Flowmeter details Transducer details a Temperature b Line temperature V Live CO2 Live N2 Dens B temperature c d V V c d a Flow rate Totalisers Line density a b b c d a Line pressure Atmos pressure b a b c c V d d Value a b V Live Cv/m a Range Limits c Value a b V Base density B Specific gravity B b Select unit type Range c d d V Limits c d a b c V d Source a
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus LIVE Input data Main turbine frequency RESULTS GROSS VOLUME FLOW RATE x 3600 Qg LIVE Input data Main turbine frequency TURBINE LINEARISATION K-factor curve Tr turbine temp ref * Kt temp corrections X METER FACTOR Lin K Factor Kp press corrections FIXED Input data A RESULTS A CORRECTIONS x 3600 Qv * K-factor curve: Frequency for flow factors 1-10 flow factors 1-10 FIXED Input data High limit LIVE Input data Low limit Prime density RESU
Chapter 11 Configuring by using the menus LIVE Input data Time period A3 SG3096 CALCULATION Time period A4 SG3096 CALCULATION SG CALCULATION Prime base density Analogue input 1 Analogue input 10 Select value and status A SELECT B SG RESULTS A Specific gravity A FIXED input data Limits Comp High Low Step Fallback Mode Value ALARM If limits are exceeded PRIME SG DENSITY SELECTION Prime specific gravity B Specific gravity B Figure 11.11 Calculating prime specific gravity Page 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analog inputs Flowmeter details Transducer details a Turbine a b b c c d V d Turbine frequency a b V Turbine K factor Flowstop threshold V Turbine K curve Corrections Turb freq hi limit Turb gross vol K Error alarm limit c d a b c d a b c V d Diff pressure a b V Orifice diameter Dynamic viscosity Isentropic c d a b V Orif expand coeff Orif tapping code c Mass rate cal sel a d b c V
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus FIXED Input data LIVE Input data High ALARM If limits are exceeded Low RESULTS Prime base density STANDARD VOLUME FLOW RATE CALCULATION Mass flow rate LIMITS Qs ALARM FIXED Input data LIVE Input data RD Air density High If limits are exceeded Low RESULTS STANDARD VOLUME FLOW RATE CALCULATION Mass flow rate LIMITS Qs Figure 11.
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analog inputs Flowmeter details Transducer details a Pulse outputs b Pulse output 1 V Reset totals Inhibit totals Pulse output 3 Pulse output 4 c d V a V Flow rate Totalisers Line density a b b c d a Pulse output 5 c d a b b c c V d d Volume a b V Standard volume Energy c Gross volume a d b Main turb error V c d Reset totalisers a b c V d Volume total Mass total Std volume tota
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus ALARM LIVE Input data FIXED Input data Tbase AGA8 parameters Pbase Invalid component Comp range RESULTS Line temperature Z AGA8 COMPRESSIBILITY CALCULATION Line pressure Zbase Molecular mass (M) Input data (normalised): % Nitrogen % Ethane % n-Hexane % Carbon monoxide % Carbon dioxide % Propane % n-Decane % Hydrogen % Hydrogen sulphide % n-Butane % Argon % C6+ % Water % i-Butane % n-Heptane % n-Nonane % Helium % n-Pentane % n-Octane %
Chapter 11 Configuring by using the menus LIVE Input data RESULTS FIXED Input data Full Kelvin mA Tbase Pbase method offset Line temperature Compressibility Z Line pressure Nx-19 COMPRESSIBILITY CALCULATION Prime SG CO 2 Mg Zbase N2 LIVE Input data RESULTS FIXED Input data Tbase Pbase mA Line temperature Compressibility Z Line pressure Nx-19mod COMPRESSIBILITY CALCULATION Prime SG CO 2 Super compressibility FPV Mg Zbase N2 LIVE Input data RESULTS FIXED Input data mA Line temperatur
Chapter 11 Configuring by using the menus LIVE Input data FIXED Input data K10 K11 K12 RESULTS K13 Tbase Pbase Line temperature Line pressure LINEAR INTERPOLATION COMPRESSIBILITY CALCULATION Z Zbase Base density Figure 11.22 Calculating linear interpolation compressibility LIVE Input data FIXED Input data RESULTS KDe Line pressure Differential pressure DENSITY REFERRAL Upstream density Downstream density value Figure 11.23 Calculating density referral Page 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analogue inputs Flowmeter details Transducer details V Flow rate Totalisers Line density a Prime value b Prime density value V Line density A Line density B c d a b b c d a V a (Units) (Live or set) Line dens prime sel (Selection) b c d a b c c V d d Value a b Offset V c d Value a b V PTZ1 PTZ2 Compressibility Offset c d a b c V Fallback a Value Mode b Den referral KDe V d c
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus LIVE Input data CALCULATE BASE DENSITY Prime SG Analogue input 1 Analogue input 10 Select value and status A CALCULATE BASE DENSITY NX-19 NX-19mod Select PTZ2 Select PTZ1 SELECT B NX-19mod3h Z-SGERG Z-AGA8 Linear interpolation RESULTS A Base density A FIXED input data Limits Comp High Low Step Fallback Mode Value ALARM If limits are exceeded PRIME BASE DENSITY SELECTION Prime base density B Base density B Figure 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analogue inputs Flowmeter details Transducer details V Flow rate Totalisers Line density a Prime value b Prime base density V Base density A Base density B c d V a V Base density Specific gravity Energy Custom application a b b c d a (Units) (Live or set) Base dens prime sel b (Selection) c c d a b c V d a d Base density A value b a b c V d (Units) (Live or set) c Value a d b V
Chapter 11 Configuring by using the menus 11.13 Configuring specific gravity RESULTS LIVE Input data FIXED Input data Time Period A 3096SG Specific gravity LIVE Input data FIXED Input data RESULTS K0 BDensityAir CALCULATE SPECIFIC GRAVITY BDensity Analogue input 10 Specific gravity FIXED Input data LIVE Input data Analogue input 1 K2 100% Select value and status CALCULATE SPECIFIC GRAVITY Figure 11.28 Calculating specific gravity Page 11.
Chapter 11 Configuring by using the menus LIVE Input data Time period A3 SG3096 CALCULATION Time period A4 SG3096 CALCULATION SG CALCULATION Prime base density Analogue input 1 Analogue input 10 Select value and status A SELECT B SG RESULTS A Specific gravity A FIXED input data Limits Comp High Low Step Fallback Mode Value ALARM If limits are exceeded PRIME SG DENSITY SELECTION Prime specific gravity B Specific gravity B Figure 11.29 Calculating specific gravity Page 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analog inputs Flowmeter details Transducer details a Prime value b SG prime value V Specific gravity A Specific gravity B c c d V a V V Flow rate Totalisers Line density Base density Specific gravity Energy Custom application a b b c d a (Live or set) Prime SG sel (Selection) b d a b c c V d a d SG A value b a b c c V d (Live or set) Value d a b c V Mass of air a d M of air b
Chapter 11 Configuring by using the menus 11.14 Configuring energy LIVE Input data SG AGA5 ENERGY CALCULATION CO2 N2 Cm RESULTS 4-20 mA Analogue input 1 Select value and status Analogue input 10 mA ENERGY CALCULATION FIXED Input data Select 0% Cm/v Select Energy 100% Parameters (see below) Cv ISO6976 ENERGY CALCULATION RD Figure 11.
Chapter 11 Configuring by using the menus From Configure option on Main Menu V Wizards Analogue inputs Flowmeter details Transducer details V Flow rate Totalisers Line density a Value a b b c c d V d Energy value b c V a V Base density Specific gravity Energy Custom application a b c c V a b c d Figure 11.33 Menu structure for configuring energy Page 11.
Chapter 11 Configuring by using the menus 11.15 Configuring custom applications User calculation Type 1 User calculation Type 2 FIXED Input data Constants Pointers A, B, X, Y a, b, c, d, e, f FIXED Input data SPECIAL EQUATION 1 = A+B A User title a(b+Xc) RESULTS User Calculation Type 1 d e+Y f ) B C t User title SPECIAL EQUATION 2 =e A+Bt+Ct 2 RESULTS User Calculation Type 2 Figure 11.
Chapter 11 Configuring by using the menus 11.16 Configuring mA outputs FIXED Input data Values 0% 100% Pointer Mode Filter Cycle time mA output mA (ANALOGUE) OUTPUT Figure 11.
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus What the “Other parameters” option does Selecting “Other parameters” brings up the following options: x Display formats Lets you specify, for each parameter: The units which are used, together with the number of decimal places or exponential format for the value. x Alarms Alarms are dealt with in chapter 8. x Communications Lets you set up all aspects of communications, including: - the function of each port. - baud rates. - character formats.
Chapter 11 Configuring by using the menus Passwords and security Securable and non-secure modes The 7951 can work in a non-secure or securable mode. In non-secure mode, anyone can have access to any of the facilities. In securable mode, access to facilities can be protected by passwords. Changing security mode On the 7951 you change the security mode by using the key switch on the front of the instrument.
Chapter 11 Configuring by using the menus Setting or changing a password This can only be done when the present access level is “Programmer”. From the main menu, select the “Other parameters” option. Next, select the “Security” option. Choose the password option (i.e. Programmer, Engineer, Operator or World) you want to set or change, then type in a password of up to 20 characters. If there is an existing password you can clear it first by pressing the CLR button.
Chapter 11 Configuring by using the menus 11.
Chapter 11 Configuring by using the menus Configuring Multiview Outline of the procedure for configuring Multiview: Step 1: Decide what text you want to display You almost certainly want each line of the Multiview display to show the name (possibly in an abbreviated form) of a parameter whose value you want to display. Bear in mind that: x Text cannot exceed 11 characters. x The display leaves a space between the text and value. x The value is displayed as a number without any units.
Dual Channel Gas Signal Converter Operating Manual Molecular Weight of Gas Calculation The molecular weight of gas in the stream can be calculated independently of the compressibility calculations.
Dual Channel Gas Signal Converter Operating Manual Page ii
Chapter 12 Routine operation 12. Routine operation 12.1 What this chapter tells you This chapter tells you how to carry out all those procedures which are a part of the normal operation of the 795x. It does not cover configuration, servicing or repair. These topics are dealt with elsewhere in this manual. 12.2 Viewing the data The diagrams on the following pages show that part of the menu structure which you use to carry out many of the procedures described in this chapter.
Chapter 12 Routine operation Main Menu V Level 2 menus Flow rates Flow totals Line density Base density / SG a Volume flow rate b a (Selection name) V Std vol flow rate Energy flow rate Gross flow rate c d a b b c d Level 3 menus V (Units) (Live or set) c (Selection name) a d a b c V d Volume flow total a b V Std vol total Energy flow total c Gross flow total a d b (Units) V d (Selection name) b V Main turb error Prover turb error Prime line density c V a d (S
Chapter 12 Routine operation Main Menu V Flow rates Flow totals Line density Base density / SG V Pressure Energy Raw gas data Level 2 menus a Line temperature c V a Density B temp Base temperature c Absolute zero a d Line temperature b b Sensor readings c d a b b d Level 3 menus V b Density B temp c d V Line temp reading V a V Line pressure b c a b Diff press hi lmt c d a d b Base pressure Limits c d DensA temp reading DensB temp reading Line pressure a V c d
Chapter 12 Routine operation Level 2 menus Main Menu V Flow rates Flow totals Line density Base density / SG V Pressure Energy Raw gas data a a b b c d V a V Custom application Health check Password Configure Propane n-Butane i-Butane c d a b b c c d Level 3 menus V n-Hexane d a a b b c c d V n-Decane d (Gas type) a b (Units) V c d a b c V Hydrogen sulphide d a b c V Carbon monoxide V Hydrogen Argon C6+ mode New gas compos d a C6+ mode Enter comp data b
Chapter 12 Routine operation Main Menu V Flow rates Flow totals Line density Base density / SG Level 2 menus a Turbine inputs b a Turbine freq.
Chapter 12 Routine operation Level 2 menus Level 3 menus From Part 1 of this menu Normalise gas data a b V Totals Chromat c d V Methane Ethane Propane n-Butane i-Butane a b c d a b V i-Pentane n-Hexane V n-Heptane n-Octane n-Nonane n-Decane V Nitrogen Carbon dioxide Hydrogen sulphide c d a b c d a b c d a Helium b c V Carbon monoxide Hydrogen Argon Live inputs V d a b c d Beta a b V Orif expand factor Vel of approach Reynolds number c d a b V Corr orif diameter Press
Chapter 12 Routine operation Main Menu V Flow rates Flow totals Line density Base density / SG V Pressure Energy Raw gas data Level 2 menus a Enter password b b c d a c V d a V Custom application Health check Password Configure See separate menus for information about configuration c d a b c d Time Software version Tag number V b a Time and date b b c d a V Actual cycle time System idle time c d Menu structure: Password, time, software version and unit ID Page 12.
Chapter 12 Routine operation 12.3 Security and passwords For more information about setting and changing passwords, and security in general, refer to chapter 10. 12.4 How you can edit displayed information The figure shows a typical display showing information about the inputs and outputs.
Chapter 12 Routine operation 12.6 Changing the units which are displayed To change the displayed units: 1. Go to the menu which displays the parameter, its value and units. 2. Press the c-button. The name of the unit currently in use shifts to the left of the display. 3. Press the UP-ARROW or DOWN-ARROW button to scroll through the list of units. Stop at the one you want. 4. Press the c-button. The unit you have selected shifts back to the right of the display. 12.
Chapter 12 Routine operation 12.11 Printed reports The two types of report The 795x can print out reports which give you information about the state of the system. There are two types of report: • Current report • Alarm log report This shows the data currently stored in a list of up to 20 locations which you specify. This shows the current contents of the alarm log, plus data from a list of up to 20 locations.
Chapter 12 Routine operation How to print a report 1. Referring to the diagram, select “Print reports”. 2. Select to print either an Alarm Log or Current Report. (There is a third selection - “Idle” - which lets you leave the menu without a report being printed.) The report is printed immediately. Some typical reports CURRENT REPORT ================ PRT input channel 1 0 TIME PERIOD I/P 3B Deg.
Chapter 12 Routine operation Page 12.
Chapter 13 Routine maintenance and fault-finding 13. Routine maintenance and fault finding 13.1 Cleaning the instrument You can use a cloth or sponge and water clean the outside of the instrument. Do not use caustic cleaning agents or abrasive materials. 13.2 Fault finding Although the instrument is designed to be extremely reliable it is possible that faults may arise at some time or another. The fault-finding charts show the most likely faults and explain how to trace their causes and put them right.
Chapter 13 Routine maintenance and fault-finding PROBLEM: A reading from a transmitter is not displayed Has it ever been displayed ? NO Check the field wiring against the wiring schedule Is the transmitter's field wiring correct ? NO Wire the transmitter up according to the wiring schedule YES YES The field wiring is faulty Is the transmitter receiving power from the 795x ? NO 795x's Connector/ Power Supply Board is probably faulty Change the Connector Board NO The transmitter or its configu
Chapter 13 Routine maintenance and fault-finding PROBLEM: The display is blank Is the power to the 795x ON ? NO Turn the power ON YES Has the fuse in the 795x blown ? YES NO Adjust the voltage so that it is within spec YES NO Is the security LED on the 795x lit ? Is the 795x's supply voltage within spec ? NO Replace the fuse by one of the correct rating 795x's Connector/ Power Supply Board is probably faulty Replace the 795x's Connector/Power Supply Board The 795x's Display Module is probab
Chapter 13 Routine maintenance and fault-finding Page 13.
Chapter 14 Removal and replacement of parts 14. Removal and replacement of parts Warning: • Electricity is dangerous and can kill. Disconnect the power supply before making any connections or dis-assembling the 7951. 14.1 Front Panel Assembly 1. Undo and remove the four screws which secure the Bezel to the case. Withdraw the Front Panel Assembly to the limits of the connecting wiring then lay it on top of the case. 2.
Chapter 14 Removal and replacement of parts 14.3 Switch Panel 1. Remove the Front Panel Assembly as explained in Section 14.1 2. Undo the four screws and washers which attach the display to the bezel. Remove the display. 3. Un-solder the flexi cable from the key switch. Remove the spring clip from the switch then withdraw the switch from the case. 4. Undo and remove the four nuts and washers which attach the Switch Panel to the bezel. Lift the Switch Panel away. 5.
Chapter 14 Removal and replacement of parts 14.5 Power supply board 1. Undo and remove the four screws which secure the Bezel to the case. Withdraw the Front Panel Assembly to the limits of the connecting wiring then lay it on top of the case. 2. Pull the Power Supply Board forwards so that it disengages from the connector at the back of the case. Withdraw the board from the case. 3. Replace all items by reversing this procedure. Take great care to ensure that the cables are not pinched on re-assembly.
Chapter 14 Removal and replacement of parts 14.8 Back-up battery 1. Ensure that the unit is disconnected from all power supplies. 2. Ensure that a new battery (CR2430) and a thin edged, non-conductive implement are within easy reach. 3. Undo the six captive screws which attach the front panel assembly to the case. 4. Carefully lift the front panel assembly away from the case. 5. Undo the yellow and green Earth lead from the panel. Do not undo the connecting ribbon cables. 6.
Chapter 14 Removal and replacement of parts 14.9 Rear Panel Assembly Warning: It is strongly recommended that in order to ensure continued compliance to EMC directives, you do not attempt to remove the rear panel assembly, but return the instrument to the factory. The instructions given below should only be carried out if it is absolutely necessary. 1. Remove the Front Panel Assembly as explained in Section 14.1 2.
Chapter 14 Removal and replacement of parts 14.10 Mother Board Warning: It is strongly recommended that in order to ensure continued compliance to EMC directives, you do not attempt to remove the rear panel assembly, but return the instrument to the factory. 1. Remove the Rear Panel Assembly as described in Section 14.9. 2. Referring to the diagram, undo and remove the six screws and washers which fix the Mother board to the rest of the Rear Panel Assembly. 3.
Chapter 15 Assembly drawing and parts list 15. Assembly drawing and parts list 15.1 What the drawing and parts list tell you The drawing and parts list show those parts of the 7951 which you can obtain as spares. To identify an item: 1. Find the item on the appropriate assembly drawing 2. Note the Item Number by the side of it. 3. look up the Item Number on the parts list. The parts list tells you: • The Part Number for the item. • A description of the item.
Chapter 15 Assembly drawing and parts list Figure 15.1: Diagram for identifying and ordering spares Page 15.
Chapter 15 Assembly drawing and parts list Item no.
Chapter 15 Assembly drawing and parts list Page 15.
Appendix A Glossary Appendix A Glossary A ADC See Analogue to digital converter Address A number which uniquely identifies a location. Alarm An indicator which shows when a failure has occurred. Alarms are classified as System, Input or Limit. API American Petroleum Institute Analogue input An input where information is received in analogue form. Analogue output An output from which information is transmitted in analogue form.
Appendix A Glossary Calibration certificate Each transducer is calibrated before it leaves the factory. The details (together with the transducer’s serial number) are recorded on a Calibration Certificate. Calibration constant Among the information given on the calibration certificate are some constants (unique to that transducer) which compare the transducer’s actual performance against a standard. The signal converter must know these constants before it can calculate accurate results.
Appendix A Glossary Degree Brix A unit on an arbitrary scale which can be converted into actual SG values. Used when describing the sugar content of aqueous solutions. Density The measured density of the fluid in a pipeline. Differential pressure The difference in pressure at two points in a pipeline. Digital to analogue converter A circuit that converts digital signals into analogue equivalents. See also Analogue to digital converter.
Appendix A Glossary H Hazardous area An area where there is a risk of fire or explosion. Health check A check that all inputs and devices connected to the 7951 are operating normally. Hg The chemical symbol for the element Mercury. Historical log A log of every alarm received by the 7951. Hub A common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports.
Appendix A Glossary L LED See Light-emitting diode. Light-emitting diode A diode which light up when current flows through it. LED’s are usually used as indicator lights on instruments. Limit Limits are upper and lower values between which a measured parameter is expected to be. If the parameter is outside these limits, it can trigger an alarm if you have set the system to do so. Live A value is live if it can be altered automatically as a result of some internal calculation or transducer input.
Appendix A Glossary P Pa See Pascal. Pascal The unit of force. 1 Pa = 1N/m Percent mass The percentage that the mass of a substance has compared to the total mass for a mixture of substances of which it is a part. Periodic time The duration of one cycle of a wave-form, equal to the inverse of the frequency. Platinum resistance thermometer A highly-accurate thermometer, based around a coil of very pure platinum wire, which is extremely stable over time.
Appendix A Glossary S Saybolt viscosity A viscosity measured using methods developed by the Saybolt company. It is obtained by timing how long the fluid takes to flow out of a cup through a hole of known size. The viscosity is expressed in units of time. Security code A code or password which a user must key in before being allowed access to all or part of a system. Sensor Another name for a transducer. Set A value is SET if it is keyed in by the user and does not change unless the user changes it.
Appendix A Glossary Transducer A device which converts a physical quantity (such as temperature or pressure) to a voltage or some other electrical quantity that can be measured and analysed. U Upload To receive data or programs from another instrument. (Opposite of Download). V Viscosity In a liquid, the resistance to that force which tends to make the liquid flow. Volume flow rate The rate at which a given volume of fluid flows through the system.
Appendix B Blank wiring schedule Appendix B Blank wiring schedule Page B.
Appendix B Blank wiring schedule Page B.
Name External connections Type Wiring schedule Connector & pin no. Pin Pin Barrier Connector & pin no. 795x Instrument Wiring colour Signal Comments Sheet of Appendix B Blank wiring schedule Page B.
Appendix B Blank wiring schedule Page B.
Appendix C Technical data for the 7951 Appendix C Technical data for the 7951 C.1 C.2 What this Appendix contains • Ordering information – understanding model codes. • List of different types of external connections you can make to 7951. • Technical Specification. • Rear panel connector diagrams and pin identity tables. • Internal earthing arrangements. Ordering information Note: To find out the exact model you have, locate the model code on the rear panel, and then use this table.
Appendix C Technical data for the 7951 C.3 External connections You can make the following types of external connections to the 7951: • • • Page C.2 INPUTS OUTPUTS SERIAL COMMUNICATIONS Analog Inputs from devices which monitor continuously changing parameters and transmit analog signals. These include: • PRTs (PT100) • temperature transducers (0/4-20mA) • pressure transducers (0/4-20mA) • differential pressure transducers (0/4-20mA) • Viscosity transducers (e.g.
Appendix C Technical data for the 7951 • POWER SUPPLIES Inputs d.c. only Outputs d.c. only. These provide power within the 7951 and to some other external devices such as transducers. Isolation notes The isolation between the enclosure and all DC power inputs, signal inputs and signal outputs is: 50VDC continuously OR 125VDC for less than 15 seconds. Consequently, isolation between any two signal lines and any DC power line is: 100VDC continuously OR 250VDC for less than 15 seconds. C.
Appendix C Technical data for the 7951 C.5 Specification General Environmental Working temperature 0 to +50°C (-4 to +158°F) Storage temperature -20 to +70°C (-32 to 122°F) Relative humidity Up to 90% non-condensing Bump BS 2011 test Eb Vibration Tested to IEC publication 68-2-6, Part II, frequency 10 to 150Hz, maximum acceleration 20m/s2 EMC Emissions and Immunity EN 61326-1998 industrial locations) Safety To BS EN 61010 standards Enclosure IP50 from the front panel, only when mounted.
Appendix C Technical data for the 7951 Inputs Analog Pulse Time period (Dens./Visc.) Quantity 4 off, each selectable as PRT (PT100) or 4-20mA Options Option for extra 4-20mA inputs: 7951MAA*38*** (Klippon): 4 off 7951MAB*38*** (D-type): 6 off Type 0/4 to 20mA Span selection Unlimited (keyboard selectable) Uncertainty ±0.008% of full scale at 25oC ± 0.001%/°C Resolution 20-bit (1 part per million) Sampling time 50ms per channel (Temperature PRT) Using Analog Inputs 1 to 4.
Appendix C Technical data for the 7951 Digital (Status) Input trigger level 0.5V RMS (1.2V p-p), Maximum 30V Input impedance 10kΩ nominal Quantity 7951MAA****** (Klippon): 6 off 7951MAB****** (D-type): 10 off Options Option for extra status inputs: 7951MAA****** (Klippon): 0 off 7951MAB*38*** (D-type): 8 off Input voltage required 5 to 24V per channel (opto-isolated) Update rate 0.5ms for prove detect, others 250ms maximum.
Appendix C Technical data for the 7951 Pulse Digital (Status) Quantity 7951MAA****** (Klippon): 3 off 7951MAB****** (D-type): 5 off Options None Type Open-collector Darlington drivers Output rating 200mA @ 24V with 50% duty cycle Switch voltage 24V maximum Maximum frequency 10Hz Quantity 7951MAA****** (Klippon): 7 off 7951MAB****** (D-type): 9 off Options Option for extra status outputs: 7951MAA*38*** (Klippon): 0 off 7951MAB*38*** (D-type): 8 off Type Output 1 is a relay (0.
Appendix C Technical data for the 7951 Hardware facilities Microprocessor Memory Processor Motorola 68332 Clock speed 24 MHz Computation resolution 64-bit (IEEE 754), fully-floating point maths package. Embedded Real-time operating system. Computation accuracy < 1 part in 1011 Program storage 2 Mbyte FLASH, field upgradeable using serial link and Winboot software tool Data storage 2 Mbyte of RAM, battery-backed by internal Lithium cell (as used by real-time clock also).
Appendix C Technical data for the 7951 Alarm annunciation Security Quantity 3 (one each for Input, System or Limit alarms) Type Red LED Operation Flash indicates new alarm condition. Steady indicates accepted alarm. Options None Mechanisms 1. Switch located on front panel 2. Software code Indicator Bi-colour LED on the front panel: 1. RED: Not secured 2. GREEN: Secured 3. ORANGE: Part-secured Options None Power Supplies Input 21V to 30V dc. Unloaded: 20W maximum. Loaded: 35W maximum.
Appendix C Technical data for the 7951 C.6 Connections C.6.
Appendix C Technical data for the 7951 C.6.
Appendix C Technical data for the 7951 C.6 Earthing In addition to earthing the chassis, (described in chapter 4), you may have to make extra earth connections in some cases, depending on the installation requirements. The types of connection can be split into three groups, each of which has different earthing requirements. The groups are: Group 1 (non-isolated power supply): Serial communications ports. Pulse outputs. Status outputs. Group 2 (isolated power supply): Status inputs.
Appendix C Technical data for the 7951 Pin 10 PL9 Pin 1 Analogue Power Pin 10 PL5 Pin 1 Density Power - Group 3 Pin 10 Connect external earths as required.
Appendix C Technical data for the 7951 Analogue Power Protect Ground Pin 25 SK8 Pin 1 Group 3 Density Power - Protect Ground Pin 25 SK6 Connect external earths as required.
Appendix C Technical data for the 7951 Earthing requirements for group 1 connections only In general, the earthing arrangements are different for large and small installations. (A small installation may possibly consist of just one instrument.) • If the 7951 is part of a large installation with separate earths for chassis and instrumentation: In this case you may (depending on the overall system requirements) earth the 7951 chassis and instrumentation separately by cutting the link on the connector board.
Appendix C Technical data for the 7951 Earthing requirements for group 2 connections only The status inputs do not have to be earthed because the circuitry contains only opto-electrical components. Earthing requirements for group 3 connections only These depend on what sort of installation you have and the environment in which it operates. You therefore have to decide what earthing arrangements you need. It is likely that this group has to be earthed at a zener barrier earth.
Appendix D Units and conversion factors Appendix D Units and conversion factors The figures in the following table are taken from BS 350: Part 1: March 1974: Parameter Length Mass Imperial units Metric equivalent 1 inch 25.4 mm 1 foot 0.3048 m 1 lb 0.45359237 kg 1 ton 1016.05 kg 1 lb/ft Density 3 16.0185 kg/m3 1 lb/gal 99.7763 kg/m3 1 lb/US gal 119.826 kg/m3 2 Pressure 1 lb/in 68.9476 mbar 1 atm 1.013250 bar 1 MPa 10 bar 1 N/m 10-5 bar 1 mm Hg (0o) -3 1.33322 x 10 bar o 33.
Appendix D Units and conversion factors Page D.
Appendix E Data tables Appendix E Data tables E.1 The tables Note: The equations used to derive these tables are given in Section E.2. Density/temperature relationship of crude oil Density (kg/m3) Temp.(°C) 60 738.91 765.06 791.94 817.15 843.11 869.01 894.86 920.87 946.46 55 742.96 768.98 794.93 820.83 846.68 872.48 898.24 923.95 949.63 50 747.00 772.89 798.72 824.51 850.25 875.94 901.80 927.23 952.82 45 751.03 776.79 802.50 828.17 853.81 879.40 904.96 930.50 956.
Appendix E Data tables Platinum resistance law (To DIN 43 760) °C Ohms °C Ohms °C Ohms °C Ohms °C Ohms -220 10.41 -120 52.04 -20 92.13 80 130.89 180 168.47 -210 14.36 -110 56.13 -10 96.07 90 134.70 190 172.16 -200 18.53 -100 60.20 0 100.00 100 138.50 200 175.8 -190 22.78 -90 64.25 10 103.90 110 142.28 220 183.17 -180 27.05 -80 68.28 20 107.79 120 146.06 240 190.46 -170 31.28 -70 72.29 30 111.67 130 149.82 260 197.70 -160 35.48 -60 76.
Appendix E Data tables Velocity of Sound in Liquids The values for a selection of fluids are given below. You can obtain further details from reference books such as Tables of Physical and Chemical Constants and some Mathematical Functions by G W C Kaye and T H Laby. Liquid Temperature (t °C) Velocity of Sound ( c ) ms-1) Rate of Change ( δc / δt ms-1K-1) Acetic acid 20 1173 ---- Acetone 20 1190 -4.5 Amyl acetate 29 1173 ---- Aniline 20 1656 -4.0 Benzine 20 1320 -5.
Appendix E Data tables Water (sea) o-Xylene Page E.4 -4 1430.2 ---- 00 1449.5 ---- 05 1471.1 ---- 15 1507.1 ---- 25 1534.
Appendix E Data tables E.2. Equations used to derive data tables Density/temperature relationship The density/temperature relationship is: ρt = ρ15 exp[− α15 Δ t (1 + 0.8α15 Δ t )] where: ρt = density at line temperature t°C (kg/m3) ρ15 = density at base temperature 15°C (kg/m3) Δt = t°C -15°C (i.e.
Appendix E Data tables For practical purposes, when the liquid volume changes from V0 to V1 as the gauge pressure changes from zero (atmospheric) to P1 , the above equation is simplified to: β=− 1 ª ∂V1 º « » V0 ¬ P1 ¼ T ISO Document TC 28/SC3/N248, (Generation of New Compressibility Tables for International Use) gives the following equations relating β to the compressibility data: loge C = 1.38315 + 0.00343804 T − 3.02909 loge ρ − 0.
Appendix F Calculations and theory Appendix F Calculations and theory F.1 The VOS effect on density measurements This sub-section shows how the 795x gas flow computer software works out the velocity of sound factors that are used for correcting line density. Two methods are provided:1. Pressure method This method is preferred and is for applications where live pressure measurement is available to the 795x. 2. Specific gravity method This is also known as the “User Gas Equation Method”.
Appendix F Calculations and theory Also for both methods, the velocity of sound of the calibration gas is calculated by the 795x using the following equation: Equation F.1#2: V.O.S. of the calibration gas Using: CC = K A + (K B * ρ1 ) + §¨ K C * ρ12 ·¸ + K D * ρ13 ¹ © Where: CC = V.O.S. of the calibration gas (in m/s) ρ1 And: = line density (un-corrected or temperature corrected) K A , K B , K C and K D are coefficients from the appropriate ‘K’ column of Table F.1.
Appendix F Calculations and theory Table F.1: 'K' Coefficient Look-up Values Calibration Gas Density range KA KB KC KD Nitrogen 0-100 Kg/m3 349.007 -0.530984 E-01 0.595473 E-02 -0.314834 E-04 Nitrogen 0-400 Kg/m3 348.994 -0.044632 0.297076 E-02 -0.418178 E-05 Methane 0-250 Kg/m 3 442.987 -0.579479 0.623017 E-02 0.0 0-400 Kg/m 3 318.079 0.913056 E-01 0.155044 E-03 -0.2564 E-06 Argon Notes: • • • The density range of the transducer is selected when configuring line density.
Appendix F Calculations and theory Equation F.1#3b: V.O.S. of the measured gas (pure of composition) for S.G. method K CG1 § (1 − CG1) + ¨¨ K © τ * CC Using: CG = Where: CG = V.O.S. of the measured gas (in m/s) CC = V.O.S. of the calibration gas (in m/s)……………………..……..{See Equation F.1#2} τ * · ¸ ¸ ¹ τ = Periodic time of density transducer output signal (in μs) K = Density transducer VOS constant = 2.10 * 104 for a 7812 Gas density transducer = (1.
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