MODEL 320 PRESSURE CALIBRATOR & LOOP POWER SUPPLY USER’S GUIDE
TABLE OF CONTENTS INTRODUCTION Page General Description………...…………………….4 Model 320 Calibrator…………………..…………4 Loop Power Supply (LPS)………………..………4 Battery Charging………………….………………5 Operation – Model 320 Calibrator Power On Sequence…………………..…………..6 Battery Check - Model 320 Calibrator…...……….9 Battery Check - Loop Power Supply………...……9 Select Key..............................................................10 Zero Key................................................................10 Min/Max Key....................
Calibration.......................................................26 Trip Detect.......................................................33 Input Functions Volts........................................................................34 Milliamps................................................................34 Pressure...................................................................35 Differential Absolute Vacuum Operation - Loop Power Supply Power On/Off Sequence.........................................
Appendix A. Entering Alphanumeric Data..............................47 B. Pressure Conversion Factors..............................48 Specifications Pressure...................................................................50 mA/V.......................................................................51 Environmental.........................................................51 Service Information Warranty.................................................................53 Return For Calibration/Repair.........
INTRODUCTION: GENERAL DESCRIPTON The Model 320 pressure calibrator is a compact, versatile, functionally styled calibrator. The unit is menu driven, so technicians can immediately begin using it to its fullest capabilities without extensive training. The Model 320 faceplate consists of three functional areas: At the top is a two line, alphanumeric liquid crystal display (LCD) for simltaneous indication of pressure and milliamps/volts readings and operator prompting.
desired. The LPS is stored in a pouch under the Model 320 calibrator for easy access. BATTERY CHARGING Units are shipped with the internal batteries in an uncharged state. Before using the Model 320 or the LPS as a portable unit, it is necessary to charge the batteries for a minimum of 14 to 16 hours. The calibrator battery charger is a wall plug-in type (see below) that connects to a jack on the right-hand side of the instrument.
OPERATION: The Model 320 calibrator is user friendly and menu driven. A first time user can normally start operating the unit with few or no instructions. The following information is intended to provide a detailed understanding of the unit. POWER ON SEQUENCE The calibrator is turned on or off by pressing the On/Off key. Each time it is turned on, a series of internal tests and calibrations are performed. The start-up procedures provide a pass/fail test of certain internal circuitry.
auto calibration does not in any way affect the primary calibration done at the factory or at a field metrology lab using available software and suitable standards. During the time the start-up tests and calibrations are being performed, certain informational displays are presented to show the status of the calibrator. The first message displayed will be: Beta Gauge 01/04/94 This indicates the date in MM/DD/YY format of the last factory calibration.
This gives the name of the owner of the calibrator. The preceding display shows the default setting as the calibrator is shipped. The name can be changed through the operator setups. See page 24 for how to change the owner’s name. The next display will be: Auto Calibration in progress This display will remain until the internal tests and calibrations are finished. If the auto calibration message fails to clear, the unit must be returned for service. See page 54 for details.
BATTERY CHECK The Bat Ck key may be pressed at any time after completion of the calibrator startup routine to diplay the current batttery voltage for approximately 1 second before the normal display returns. The current input funciton is not disturbed by making a battery check measurement. The battery voltage of the Model 320 calibrator should be between 5.3 and 4.6 volts. When the voltage falls below 4.8 volts, a warning message is displayed approximately every minute. When the voltage falls below 4.
The LPS battery voltage should be between 10.6 and 9.2 volts, indicating a full charge. When the voltage falls below 8.8 volts, the LPS will turn itself off to prevent damage to the batteries due to possible cell reversal. SELECT KEY The Select Key is used for two functions. First, while in Setup, pressing Select will switch the dispay from two sets of menu screens. Second, Select is used in the field calibration described on page 26.
pressure). A barometric standard of at least .025% accuracy should be used to determine atmospheric pressure. When entering this value, proper decimal place entry must be observed. The “Zero” key is inactive during user calibration. Only numeric entry (9) is active in this mode. MIN/MAX KEY The Model 320 calibrator constantly monitors the displayed readings and stores the minimum and maximum values internally. Pressing the Min/Max key will cause the minimum and maximum values to be displayed.
ENG UNIT KEY The Eng Unit key allows the user to select any of the 8 standard or 1 user definable engineering units to be activated for the pressure display. Each time the Eng Unit key is pressed, the next engineering unit is selected. Engineering units which exceed PSI resolution, will not be valid. Example, 50,000 counts, when converted from the 5000.0 PSIG converted to mmHg equals 258,575 mmHg. This exceeds 50,000 counts and will not be an active unit of measurement.
than the instantaneous values. This feature is useful when measuring pressures that are pulsating or otherwise unstable. The Model 320 makes 2-3 pressure measurements per second. When the Damp mode is active, the Model 320 updates the display each time a measurement is made. The displayed is the average of the last 16 measurements. PORT SELECT KEY The Port Select key is used to select either or both of the pressure ports to be displayed on dual sensor 320 calibrator models.
MA/V KEY The mA/V key will alternate the electrical measurement being displayed between milliamps and volts. % KEY Pressing the % key will cause the Model 320 calibrator to switch from displaying in the selected engineering units to displaying the readings as a percentage. The Model 320 percent function is a powerful feature that greatly simplifies the calibration of I/P, E/P, P/I, P/E AND P/P transmitters.
Once the proper zero and full scale values have been entered, the operator presses the % key to activate the percent function. The zero and span adjustments to the transmitter can now be quickly adjusted by applying aproximately 0% and 100% inputs to the transmitter as shown on the display, and adjusting the output for 0% error as shown on the display.
detect mode that is available through the setup menus. When trip detect is active, the Model 320 calibrator will monitor the electrical measurement for a significant change of state. When a change of state is detected, the last pressure measurement is frozen on the display, and the message “tripped” is displayed over the electrical measurement. When the Trip Rst key is pressed, the Model 320 will resume displaying the instantaneous pressure and monitoring for a change of state at the electrical terminals.
CLEAR KEY The Clear key allows the operator to re-enter an incorrect numeric entry. When the Model 320 calibrator is expecting a numeric entry, a ????? prompt is displayed. As numeric keys are pressed, the value is echoed on the display. If a keying error is made, press Clr to cancel the value entered and return to the ????? prompt. SETUP KEY AND MENUS The Setup key allows the user to perform certain custom operations with the Model 320 calibrator.
Next to each menu in Setup is a number. Pressing that number on the keypad allows the operator to configure that specific item. 1 = UsrEng (User Defined Engineering Unit) This allows the user to enter a custom engineering uit coversion. The conversion factor to be entered is the conversion from 1 PSI. Up to 6 significant digits can be entered, however, the Model 320 calibrator will display a maximum of 50,000 counts.
After the conversion value is entered, the name for the new units can be entered. The name consists of 1 to 5 alphanumeric characters that are selected by entering their decimal equivalent. Appendix A gives additional information on this. If you do not choose to enter a name, press the Clr key and a default name of USER will be applied. As an example, to set up a user defined scale for standard atmospheres where 1 PSI = .06805 atmospheres, enter the following: enter 1PSI equiv ????? Enter .
The name shown in the lower left is the last name that has been entered. To enter Atmos as the name, you would enter the following values (press Enter after each value) 65, 116, 109, 111, 115. (See Appendix A). Press for any undesignated letter to exit the routine. If all 5 are used, exiting will be automatic after the fifth entry. To access the new user defined units, press the EngUnit key until Atmos is displayed as the engineering units.
Press either 1 or 2 using the numeric keys to turn battery save on or off. 3 = %func (Percent Function) The percent function allows the operator to specify the zero and full scale values for a calibration to be performed. The Model 320 calibrator will then automatically calculate the percent of error based on this information.
Note that the input will be a pressure value for P/I or P/P transmitters, and will be a voltage or milliamp value for an I/P or E/P transmitter. After the input zero is entered, the next screens will prompt for input full scale, output zero, and output full scale: enter input FS + 100 ????? enter output z + 4 ????? enter output FS + 20 ????? After the zero and full scale values are entered, the operator will be prompted to define the type of instrument being calibrated.
1 = I/P 3 = P/P 2 = P/I Select I/P for transmitters that accept a current or voltage as an input and produce a pressure as an output. Select P/I for transmitters that accept a pressure as an input and produce a current or voltage as an output. Select P/P for pneumatic transmitters that accept a pressure as and input and produce a pressure as an output. The P/P selection is only available on a Model 320 that is equipped with two (2) pressure sensors.
Select “2” if the pressure input to the pneumatic transmitter is being measured on the right port of the Model 320. After the percent function setup is completed, the function is activated by pressing the % key. 4 = H2Oref (H2O Reference Temperature) The H2O Reference refers to the temperature correction for inches and centimeters of water measurements. There are three choices: 20 °C, (ISA Standard); 4 °C, (Scientific Standard); and 60 °F, (American Gas Association Standard).
identifying information into the calibrator’s nonvolatile memory. The owner’s name cannot be changed unless the operator knows the unit's access code. The access code is unique to each calibrator and is printed on the individual calibration sheet that is shipped with each calibrator. When a new calibrator is received, the owner should enter the desired owner name and file the access code in a safe place for future reference. DO NOT keep the access code with the calibrator.
value of the desired character. Appendix A lists the values for each character. To advance to the next position without changing the existing character, press Enter while the ????? prompt is showing. To back up to previous position, press Clr while the ????? prompt is showing. Press the < ENT > key repeatedly to exit the routine.
Function to calibrate Volts In mA In pressure; zero, span linearity Required ref source 10VDC ± .01% 20mA ± .01% pressure at 0%, 25%, 50%, 75%, 100% of scale. Accuracy should be 3 times better than the Model 320 range. The sequence required to perform the calibrations is (1) apply the required calibration source, (2) observe the reading on the Model 320, (3) if the reading on the 320 is outside of the required tolerance, enter the desired reading.
To place the Model 320 into the calibrate mode, press 6 (user cal) while in set up mode, screen number 2. The unit will prompt for the access code to be entered. enter access code ????? Enter the calibration access code from the individual calibration data sheet that is supplied with the unit. If the correct access code is entered, the Model 320 will enter the calibration mode as shown below. volts user cal + 10.000 volt in The following keys are active during calibration mode.
Select – proceed to the next calibration step. Clr – If depressed while a user calibration step is active, ????? will be displayed prompting the user to enter the new calibration value from calibration source. If depressed during numeric entry, it functions as the normal clear entry key. Enter and number keys – used to enter calibration values Calibration values are entered as counts without any decimal places. For example, when calibrating milliamps, the display might show 19.997.
4. If the reading is within the required limits, press Select to progress to the next step. After the last calibration step, the user is prompted to enter the date. THE CALIBRATION DATA IS NOT SAVED UNTIL A DATE IS ENTERED. DETAILED PROCEDURE 1. Insure that the Model 320 to be calibrated by means of the user calibration mode is temperature stable at 25 degrees C ±5 degrees. Any deviation will induce temperature compensation correction inaccuracies. 2. Press the “set up” key. Select 6 from menu #2.
Left pressure zero Vent for gauge, and gauge vacuum, 0.003 PSI or less for absolute Left pressure Span Left pressure 25% Left pressure 50% Left pressure 75% (enter date single sensor) Right pressure zero FS – range dependent 25% of FS 50% of FS 75% of FS Right pressure Span Right pressure 25% Right pressure 50% Right pressure 75% (enter date dual sensor) Vent for gauge, and gauge vacuum, 0.
exit the calibration mode. To calibrate electrical or pressure functions proceed as follows. 3. Apply a 10 volt signal to the volts input. If adjustment is required press the CLR key. Next, enter the correct reference voltage value. Calibration values are entered in counts without any decimal places. Enter 10000 for 10.000 volts. Repeat the sequence if necessary to acquire a proper calibration. When you are satisfied with the calibration press the Select key to proceed to the next calibration step. 4.
next calibration step.. points to be calibrated. Repeat this process for all At the end of the pressure calibration sequence you will be prompted for the current date. The format is MMDDYY. CALIBRATION DATA IS NOT SAVED UNTIL A DATE IS ENTERED. 7 = Trip (Trip Detect) The trip detect setup function allows trip detect to be turned on or off: trip detect 1 = on 2 = off The operation of the trip detect function is explained on page 15 and 16 under the Trip Rst key.
INPUT FUNCTIONS VOLTS The Model 320 measures voltage at the volts terminals at the lower left corner of the keypad area. The negative terminal is common to volts and milliamps measurements. To measure voltage, press the V/mA Key, until Volts is displayed on the upper line of the LCD display. If you have a Model 320 wih 2 pressure sensors, you must first ensure that volts/mA are available by pressing the Port Select key. There are 2 voltage ranges and the Model 320 autoranges between them.
at the lower left corner of the keypad area. The negative terminal is common to volts and milliamps measurements. To measure current, press the V/mA Key, until milliamps is displayed on the upper line of the LCD display. If you have a Model 320 with 2 pressure sensors, you must first ensure that volts/mA are available by pressing the Port Select key. There are 2 current ranges and the Model 320 autoranges between them. The ranges are 020.000mA and 0-50.00mA.
The Model 320 does not employ any overpressure relief bypass. The maximum overpressure for the various sensors is given in the specifications section. Exceeding these pressures can cause a shift in the calibration of the unit or permanent damage to the sensor. OPERATION LOOP POWER SUPPLY The Loop Power Supply (LPS) contains eight (8) AA Ni-Cd batteries that provide power to a DC to DC converter. This converter boosts the battery voltage (10.6 to 9.2) to 24 VDC ±5%.
turn on. Open the loop and power down occurs. This allows for maximum battery life by not allowing the unit to be left in the on mode accidentally. The LPS can be used with or without the Model 320 calibrator. When the test leads are connected from the LPS Loop Power connections to a device requiring power, the LPS automatically turns itself on and provides 24 VDC. Breaking the connections causes the LPS to automatically turn itself off, preventing needless battery drain.
The LPS battery voltage should be between 10.6 and 9.2 volts. When the voltage falls below 8.8 volts, the LPS will automatically turn itself off to prevent damage to the batteries due to possible cell reversal. The battery charger used for the Model 320 should be used for the LPS. APPLICATION NOTES USING THE MODEL 320 PRESSURE CALIBRATOR WITH A HAND PUMP 1. Safely take the instrument to be tested out of service, equalize it, and vent it. 2.
4. Turn on the Model 320 and select mA. 5. Select the desired engineering units by pressing the Eng Unit button. 6. Press the Zero button to zero the Model 320. Checking zero several times in the first 4 minutes of operation is recommended. 7. Proceed with calibration.
Transmitter Calibration Using Pressure Pump 40
USING THE MODEL 320 PRESSURE CALIBRATOR AND LPS WITH A HAND PUMP 1. Safely take the instrument to be tested out of service, equilize it, and vent it. 2. Vent the low side to atmosphere and connect the high side as shown, being very careful that there are no leaks. Note: It is best to drain the high and low sides to prevent liquids from entering the calibration tubing. 3. Connect the special connector to the Model 320 mA input. 4.
Transmitter Calibration Using Loop Power Supply (LPS) 42
Pressure Switch Calibration Using Trip Detect 43
Calibration of a Pneumatic Flow Transmitter 44
CALIBRATION USING % FUNCTION You can use the % Function to calibrate a P/I pressure transmitter. For this example we will calibrate a pressure transmitter that has a manufacturer’s range of 0-50 PSIG. The desired calibration will be 0-25 PSIG for a 4-20 mA output. We are using a Model 320 with a 30 PSIG range. Press Setup-3 to enter the percent function setup mode.
This shows that the pressure input to the transmitter is at +0.00% of scale, and the milliamp output is 1.25% low. If the % of scale reading is not 0%, you can press the Zero Key to acquire a new zero reference. Change the zero adjustment on the transmitter until the % error reading is 0%. Now apply pressure to the transmitter and Model 320 and adjust the pressure until the % scale reading is 95-100%. Change the span adjustment on the transmitter until the error reading is 0%.
APPENDIX A Entering Alphanumeric Data The user is required to enter alphanumeric data when changing the owner’s name and configuring user defined engineering units. Since the Model 320 does not have an alphanumeric keyboard, the characters are entered by using the decimal equivalent of each character from the table below. 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 sp ! “ # $ % & ‘ ( ) * + , .
APPENDIX B Pressure Conversion Factors The factors used by the Model 320 Calibrator to convert from PSI to other enineering units aare listed below. 2.036 51.715 6.8948 68.948 .068948 27.681 27.707 27.730 70.310 70.376 70.433 “Hg mmHg KPascals milliBars Bars “H2O “H2O “H2O cmH2O cmH2O cmH2O @ 0ºC @ 0ºC @ 4ºC @ 60ºF @ 20ºC @ 4ºC @ 60ºF @ 20ºC If conversions at full scale exceed the maximum 50,000 count resolution, the converted engineering unit becomes invalid and will not display.
SPECIFICATIONS MODEL 320 PRESSURE CALIBRATOR AVAILABLE RANGES: Gauge Vacuum Absolute Differential PSIG PSIG PSIA PSID*** 0-0.39** 0 to –1** 0-15* 0-1** 0-1** 0 to –5** 0-30* 0-5** 0-5* 0 to –15** 0-50* 0-30** 0-7.8* 0-50** * Prior to Jan. 2002, these ranges were 0-15* typically non-isolated sensors that required 0-30* clean, dry, non-corrosive air or gasses for 0-50* pressure media. As of Jan.
ACCURACY: * PRESSURE: ±(%Rdg, ±%FS, ±1 LSD) %Rdg %FS PSI Res. PSI Range 0.39 0.07 0.03 0.0001 1 0.07 0.03 0.0001 5 0.05 0.02 0.001** 7.8 0.05 0.02 0.001 15 0.05 0.02 0.001 30 0.05 0.02 0.001 0.05 0.02 0.001 50 100 0.05 0.02 0.01 150 0.05 0.02 0.01 0.06 0.03 0.01 300 1000 0.06 0.03 0.1 0.07 0.03 0.1 1500 0.1 0.1 3000 5000 0.1 0.1 * Includes the effects of non-linearity, repeatability, hysteresis, and temperature for 180 days. ** Sensors manufactured prior to 1997 may display 4 decimal places.
ELECTRICAL: ±(%FS, ±1 LSD) Standard Units: Res. Range Units %FS 0-10 V 0.025 0.001 0-30 V 0.1 0.01 0-20 mA 0.025 0.001 0-50 mA 0.1 0.01 CSA Approved / Intrinsically Safe Units: Range Units %FS Res. 0-10 V 0.05 0.001 0-30 V 0.1 0.01 0-20 mA 0.05 0.001 0-50 mA 0.1 0.01 IMPEDANCE: Volts 1 MegaOhm mA 25 Ohms RESOLUTION: 50,000 counts maximum, depending on range (see accuracy table) and engineering unit (see appendix B). TEMPERATURE: Operating: 0 to 50ºC (No Effect on Accuracy within this range.
Storage: -30 ºC to 50ºC, with batteries; -30 ºC to 70 ºC without batteries. OVERPRESSURE: Operating, without damage or calibration shift: 0-100 psi 300% of sensor range 300-1500 psi 150% of sensor range 2000-5000 psi 150% of sensor range or 6100 psi whichever is less. Custom order ranges will deviate. Consult factory for overpressure specification. PRESSURE FITTINGS: 1/8” FNPT 316SS. ELECTRICAL CONNECTIONS: Miniature recessed banana jacks.
WARRANTY Beta Calibrators devices are warranted to be free from all latent defects in material and workmanship under normal use and service.
SERVICE INFORMATION Return for calibration, recertification or repair. It is recommended that each calibrator be recalibrated and/or recertified on a 6 month basis, against precision standards that are traceable to the National Institute of Standards and Technology. All returns should include a statement on the work requested and the exact address to which the unit should be returned. Beta Calibrators will return units on a prepaid basis.
Website: www.betacalibrators.com Email: sales@betacalibrators.com When calling for a form, please provide your Purchase Order Number and an explanation of why equipment and/or parts are being returned. After the form has been obtained, return equipment along with the form and a copy of your Purchase Order. This will ensure rapid service and/or credit.
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