MODEL 230/235 Temperature Calibrator User’s Guide
Temperature Calibrator Model 230 ON OFF BAT CK CE ZERO 7 8 4 V mV mA 9 TC RTD In Put 5 6 Ramp Ω Out Put 1 2 3 Auto - .
Table of Contents Introductions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . 1 Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Power On Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 3 Input/Output Selection . . . . . . . . . . . . . . . . . . . . . . . 5 Menu Selection . . . . . . . . . . . . . . . . . .
Output Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Volts/Millivolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Milliamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Thermocouple Simulation. . . . . . . . . . . . . . . . . . . . . . 46 Ramp Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Auto Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 mA/V Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . 82 Output Specifications . . . . . . . . . . . . . . . . . . . . . . . 85 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 mA/V Module Specifications . . . . . . . . . . . . . . . . . . . . 89 Pressure Module Specifications . . . . . . . . . . . . . . . . . .
Introduction General Description The Model 230/235 Temperature Calibrators are compact, versatile, functionally styled calibrators. These units are menu driven so technicians can immediately begin using them to their fullest capabilities without extensive training. The Model 230/235 consists of four functional areas: At the top is an alphanumeric liquid crystal display (LCD) for simultaneous indication of input and output readings and operator prompting.
Battery Charging Units are shipped with the internal batteries in an uncharged state. Note: Before using the Model 230/235 calibrator for the first time, 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) which connects to a jack on the right-hand side of the instrument. Battery operation time is 7-8 hours, typically. CALIBRATOR CHARGER INPUT: 120VAC 60 HZ OUTPUT: 5.
Operation The Model 230/235 Temperature Calibrators are user friendly and menu driven. A first time user can normally start operating the unit with little or no instruction. The following instructions are intended to provide a detailed understanding of the unit. CAUTION: The operation of the calibrator may be impaired if a twoway radio is keyed near the unit. Power On Sequence The calibrator is turned on or off by pressing the ON/OFF key.
This indicates the date in MMDDYY format of the last factory calibration. The example indicates the Model 230/235 was calibrated on August 5, 1993. The next display will be: property of YOUR NAME HERE This shows the name of the owner of the calibrator. The above display shows the default setting as the calibrator is shipped. The name can be changed by selecting “owner” from the setup menu. See page 25 for details on how to change the owner’s name.
Input/Output Selection The Model 230/235 calibrator has a single set of function keys for controlling both input measurements and output simulation. The input measurement section of the calibrator is completely isolated from the output simulation section. To select input or output functions the INPUT and OUTPUT keys are used. The calibrator is in output mode following power on.
Menu Selection The Model 230/235 calibrator has several functions that require additional information once the function has been selected. The additional information is entered by picking from a menu or list of items. For example, when selecting the Thermocouple function, you must pick the type of thermocouple and the temperature scale. A detailed description of the menu is provided with each function that has menu choices.
voltage falls below 4.65 volts, a warning message is displayed is displayed approximately every minute. When the voltage falls below 4.5 volts for 1 minute, the calibrator will turn itself off to prevent damage to the batteries due to possible cell reversal. INC/DEC key functions The INC and DEC keys are represented on the keyboard by up and down arrow symbols respectively. They are multifunction in nature. Their use is explained in detail in each section of the manual where they are used.
CE/ZERO Key When the calibrator is in the output mode and you press any of the numeric keys (0-9), the keystrokes will be displayed until you press ENT and the value is accepted by the output function. If you make a keying error, the CE key is used to clear the erroneous entry and allow the correct value to be re-entered. If you press CE a second time before entering any numeric data, the keypad display mode is canceled and the calibrator returns to displaying the actual output simulation value.
Option Key The OPT key is used to activate the external module that is attached to the feature connector of the Model 230/235 calibrator. When the OPT key is pressed for the first time after the calibrator is powered on, the calibrator reads the configuration and calibration data from the attached module. If no valid module is attached, or if the attached module is not supported by the software revision of the calibrator, an error message will appear.
If the module is not capable of operating in the mode requested, an error message will be displayed. The operation of the Pressure Module can be found on page 36, that of the mA/V Module can be found on page 54. Ramp Key The RAMP key is used to activate the ramp function which is covered in the Output Functions section starting at page 54. % Key (Model 235 Only) The % Key allows easy access to the % Error Function.
If no tags have been entered, the display will indicate: ----------------------------------SEQ=01 EMPTY If calibration is complete, the display will indicate “Pass” or “Fail” instead of “Ready”. Pressing the INC/DEC key will allow the user to scroll through the tag list. To directly view the desired tag, type its two digit sequence number on the numeric keypad. Press SYS to exit the system mode; to continue, press ENT when the desired instrument tag is displayed.
If “Review” was selected, the test points would be displayed. INPUT +4.000 +6.000 +8.000 OUTPUT +10.000 +20.000 +30.000 Press the INC/DEC keys to scroll through additional points. Press ENT or CE to return to the previous menu. Clear All Data allows “As Found” and “As Left” data previously stored to be cleared. This option is only allowed if enabled by the Calibration System. If this option is not enabled, the display will not have Clear All Data as an option beneath the REVIEW and TEST options.
step the calibrator output through the calibration points. Once the desired results are achieved, press AUTO as indicated on the calibrator display. MA mVOLTS +4.000 +10.000 ADJUST UNIT AUTO WHEN DONE When “AUTO” is pressed, the calibrator again sets itself at the first cal point and prompts the operator to press AUTO again to start the “As Left” calibration procedure. Pressing CE will take the calibrator back to the Test Complete menu. MA mVOLTS +4.000 +10.
If “Done” is selected, the calibrator will prompt “Test Finished” and the operator will be prompted to enter his/her ID number. TEST FINISHED ENTER TECH ID# ??????? The operator will press ENT and then be prompted to indicate “Unit Final Status” and choose from “Adjusted”, “Replaced”, or “No Action”. Select the desired menu and press ENT. UNIT FINAL STATUS NO ACTION ADJUSTED REPLACED At this time, the calibrator returns to the beginning mode and a new tag number can be selected for the next calibration.
Note: It is the responsibility of the user to ensure that the Pressure Module being used is the proper range for the calibration being performed. If the instrument being calibrated has a pressure output, no special action is required during the automatic test. The pressure will be monitored as the input function on the calibrator and will be recorded automatically at each calibration point. If the instrument being calibrated has a pressure input, the pressure will have to be generated manually by the user.
When READY is being displayed, the applied pressure is within tolerance. You should wait until the actual pressure readings stabilize and then press the ENT key. The calibrator will then store the readings and step to the next calibration point.
If the input to the instrument cannot be generated by the calibrator, the calibrator will be configured for Manual output. An example might be a magnetic flow meter that requires a manufacturer specific device to simulate a flow into its input. There is an additional feature associated with Manual outputs.
numeric keypad and then press ENT. If the closest you could get to the desired value was 9,950 GPM, you would enter this value and press ENT. It is possible for an instrument to be configured for both Manual input and Manual output. An example might be a glass thermometer that is to be calibrated in a temperature bath. In this case the calibrator will first prompt for the user to set the external output and then prompt the user to enter the external input.
Operator Setup The SETUP key activates the operator setup mode. This allows the operator to preset several convenience features to customize the calibrator for a particular user or application. The SETUP can be activated any time except when the calibrator is displaying a menu. When the SETUP key is pressed, a screen is displayed on the Model 230 showing the first 4 options available. 1-LCD Vu 3-IncDec 2-BatSav 4-CJunct If the INC or DEC keys are pressed, additional groups of setup options are displayed.
LCD Vu (Adjust LCD viewing angle) The LCD viewing angle or contrast may be adjusted electronically for optimum viewing under various conditions. There are 8 levels to the contrast adjustment. Press the INC or DEC key to select the adjustment that is optimum for your conditions. Viewing Angle sn 1355 uc 0300 The second line of the viewing angle screen displays additional useful information. The left side displays the serial number of the unit and should agree with the serial number label on the case.
current scale or a user defined calibration point from a predefined list of calibration points. This feature allows the user to program the INC/DEC keys to function in one of two modes: user defined calibration points, or percent of scale. Press the 3 key to program or setup the INC/DEC key functions. The first menu allows you to select Cal Points or Percent. The display will prompt with following: IncDec Key Funct CalPts Percent To setup for the cal points function, highlight CalPts and press ENT.
the last calibration point is entered, the next screen will be: Zero point value ??????? Enter the value in engineering units for the function you will be using that represents the zero value for the calibration points function. After entering the zero point, the next screen will be: Full scale point value ??????? Enter the value in engineering units for the function you will be using that represents the full scale value for the calibration points function.
Example #2: Programming a 3 point calibration for a 0-10mV input to a recorder. The calibration points entered would be: cal point #1 cal point #2 cal point #3 zero point full scale point 0 50 100 0 10 (%) (%) (%) (mvolts) (mvolts) Utilizing Calibration Points Once calibration points have been enabled in the Setup Menu, they are activated by simply pressing the INC or DEC key after selecting the appropriate output function.
The first prompt will be for the functions that require a percent of scale. V, mV, Ohms percent 10.00 Enter a new value or just press ENT to retain the current value. The second prompt will be for the functions that require a degree value. RTD, TC degrees 100.0 Enter a new value or just press ENT to retain the current value. CJunct (thermocouple cold/reference junction compensation) The Model 230/235 calibrator performs automatic cold junction compensation for both input and output thermocouples.
The internal temperature compensation is performed by a semiconductor temperature sensor located next to the thermocouple output terminals. The external temperature compensation is performed in a special external module that connects to the Model 230/235 calibrator’s ECJ jack on the front panel. Note: This module must be used to obtain specified accuracy. Martel P/N 910200-001 If automatic compensation is selected, the calibrator will display the current reference junction temperature reading.
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. When the owner setup is selected, the operator is prompted to enter the access code. Enter the access code from the calibration sheet and press ENT. If the incorrect code is entered, an error message is displayed and the calibrator returns to the setup menu.
Pause (Set pause time for auto CalPts and Ramp) The AUTO key will cause the Calibration Points or Ramp program to repeat continuously without intervention. This setup option allows you to specify how long the calibrator will pause between Calibration Points or Ramps when the AUTO key is pressed. seconds btwn cal points 10 Enter the dwell time in seconds to pause between each cal point or at the end of each ramp cycle, and press ENT.
Save (Save setup values in non-volatile RAM) This function allows the setup parameters that have been entered to be saved in non-volatile RAM. If the Setup mode is exited without saving (by pressing the SETUP key a second time), the setup parameters remain temporary in nature and will only be retained until the instrument is powered off. The SAVE option will allow the setup parameters to be retained, even with power off, until they are changed by the operator.
Input Dampening Disable Enable Select either Enable or Disable using the INC/DEC keys and press the ENT key. % Error Display This option allows the user to configure the active input and output function so the calibrator can internally compare them and display the % error. For example, assume a 300°F to 1200°F calibrator output and 4-20mA calibrator input.
If a pressure of 1478.7 PSI (98.85% of scale) is applied, the transmitter would be expected to output 98.58% of range or 19.773mA. If the transmitter were outputting only 19.757 (which is a -.1% error), the display would indicate: % error % scale -0.10% +98.58% It is then a simple matter to adjust the transmitter span to achieve a 0% error reading. The calibration technique is to adjust zero for zero % error and adjust span for zero % error. Repeat as required.
To display the 235 input and output in % ERR and % Scale units, press the % Key. Subsequent presses of the % key, will toggle the 235 between engineering unit and % ERR/% Scale unit displays. Once the calibrator is turned off, all % Error setup are lost. External Temperature Compensation Module The External Temperature Compensation Module allows the calibrator to perform thermocouple calibration using copper wire and to operate under harsh temperature variations.
Input Functions Input functions are selected by pressing any of the function keys while the calibrator is in input mode. Functions available on the Model 230/235 are Volts, Millivolts, Milliamps, Ohms, RTDs, and Thermocouples. Input mode is selected by pressing the INPUT key. The calibrator remains in input mode until the OUTPUT key is pressed. The cursor position on the display provides an indication of input or output mode.
TC (Thermocouples) The Model 230 calibrator supports 11 thermocouple curves, JKTERSBNCGD. The Model 235 calibrator supports 15 thermocouple curves, JKTERSBNCGDLtMP. The additional curves on the Model 235 are: L = J Thermocouple (Din Curve) t = T Thermocouple (Din Curve) M = Ni-Ni Moly P = Platinel Both calibrators can read out in either degrees Celsius or Fahrenheit. To measure a thermocouple output, press the TC key when the calibrator is in the input mode.
begin making thermocouple measurements and display the readings on the left-hand side of the display. Int J °F + 212.0 The top line of the display contains information about the measurements. The first three characters indicate the type of reference junction compensation in effect. Int = automatic compensation using the INTERNAL sensor. Ext = automatic compensation using the EXTERNAL sensor. Man = manual compensation.
The 235 display will prompt: Resistance Function RTD OHMS Select OHMS using the INC/DEC keys and press ENT. The Model 230/235 calibrator will display a prompting menu asking for the type of connection: 2-wire, 3-wire, or 4-wire. Termination type 2W 3W 4W Select the type connection you will be using and press ENT. For actual calibration the more accurate 3-wire or 4-wire method should be used. Two wire connections are normally used for go/no-go measurements and trouble shooting.
calibrator will prompt for the type of connection: 2-wire, 3-wire, or 4wire. Termination type 2W 3W 4W Select the type of connection you will be using and press ENT. For actual calibration, the more accurate 3-wire or 4-wire method should be used. The calibrator will begin making RTD measurements and display the readings on the left-hand side of the display. RTD 4w°F + 212.0 The top line of the display contains information about the measurements being made.
thread lubricant should be used when making the connection to prevent seizing or galling. Media Compatibility The Pressure Module is designed to provide optimum accuracy as a secondary calibration device. It is not designed to be a general purpose test gauge to be attached to live processes. The low pressure ranges (0-100 PSIG) are compatible with non-corrosive gases. For long service with good stability and accuracy, clean, dry instrument air or nitrogen should be used.
appear. Engineering Unit PSI “H2O “Hg Kpa This menu allows the selection of engineering units for pressure display. The choices are displayed 4 at a time. Scrolling past the first or last displayed selection provides additional choices. The engineering units available are: PSI, inH₂O, inHg, Kpa, cmH₂O, mmHg, mbar, Bar. The selection between absolute and gauge is made automatically based on the type of module attached.
The Pressure Module is capable of operating as an input or output function, even though it is a measurement only device. This allows simultaneous measurement of pressure and milliamps if desired. To operate the Pressure Module as an input function, press the OPT key while the calibrator is in the input mode. This will permit any allowable output function to be active simultaneously with pressure measurements.
observing the reading. If a shift has occurred, a new zero is obtained by pressing the CE/Zero Key while in input mode. Note that you must zero the pressure reading any time a new engineering unit is selected. Zeroing an absolute pressure module When a Pressure Module with an absolute sensor is used, the zero or offset procedure is modified to allow the user to enter the local barometric pressure as the zero. When the CE/Zero key is pressed, a prompting screen is displayed.
no external module present The pressure adapter module receives power and commands from the calibrator’s output section and the pressure readings are made through the calibrator’s input section. As a result the calibrator loses its input to output isolation any time the pressure module is plugged into the feature connector. This is not a problem as far as pressure measurements are concerned.
The trip detect feature can utilize either the volts or 2-wire ohms input terminals. If the alarm circuit has powered contacts, the volts input should be used. If the alarm circuit has dry or non-powered contacts, the ohms 2-wire input should be used. If the voltage input is used, the maximum input voltage is 30 volts; however, the calibrator can only detect changes in the 0-10 volt range. This is normally not a problem, since the powered contacts typically switch between 0 volts and 24 volts.
Armed xxxxxx After the trip occurs, the input display shows: Tripped xxxxxx To restart the ramp and reset the trip condition, press either the INC or DEC key once to reset the ramp to the starting or ending value and reset the tripped indication. Press the INC or DEC key a second time to start the ramp. Be sure to reset the external trip circuit if necessary before starting the ramp. Min-Max Mode The calibrator continuously stores the minimum and maximum values of the input readings.
An example would be the testing of a thermocouple transmitter. The output CalPts would be setup for 0-25-50-75-100 percent and the zero and full scale points entered. Next the input mA function would be selected. Press SETUP and select the menu for InpRdg. Enter 4 as the zero point and 20 as the full scale point. Step through the CalPts using the INC key and observe the input readings. The transmitter’s error in percent of scale will be the observed reading minus the CalPts value.
Output Functions Output functions are selected by pressing any of the function keys while the calibrator is in output mode. Output functions available on the Model 230/235 are Volts, Millivolts, Ohms, RTDs, and Thermocouples. Output mode is selected by pressing the OUTPUT key. The calibrator remains in output mode until the INPUT key is pressed. The cursor position on the display provides an indication of input or output mode.
achieved at all times. The internal microprocessor will automatically correct for any drift due to temperature or battery change. Millivolts The millivolts output function is identical to the volt function except that the value is entered and displayed in millivolts. TC (Thermocouples) The Model 230 calibrator supports 11 thermocouple curves, JKTERSBNCGD. The Model 235 calibrator supports 15 thermocouple curves, JKTERSBNCGDLtMP.
Select the type of thermocouple you will be using and press ENT. The calibrator will prompt for the temperature unit to use. Temperature Scale °C°F Select the proper temperature unit and press ENT. The calibrator will prompt for the desired output temperature in degrees. Temp ?????? Enter the desired temperature within the range of the selected thermocouple and press ENT. If an incorrect or out of range value is entered, the calibrator will display an error message and prompt again for a value.
OBSERVE THERMOCOUPLE POLARITY. THE RED V/TC TERMINAL OF THE CALIBRATOR IS THE POSITIVE TERMINAL. The calibrator should be connected to the device under test using the same type wire as the thermocouple being simulated. This will cause any difference in temperature between the calibrator’s reference terminals and the terminals of the unit under test to be compensated for automatically. The ranges, resolutions, and accuracy of the various thermocouples can be found on page 86.
RTD/Ω Simulation The calibrator output supports two 100 ohm Platinum RTD curves, the European/DIN 43760 α=.00385 and the American α=.003916 curve, 120 Ohm Nickel Minco and 10 Ohm copper SAMA RC21-4-1966 with read out in degrees Celsius or Fahrenheit. To simulate an RTD: Press the RTD/Ω key while the calibrator is in the output mode. (Note: on the 230, press the RTD key). The 235 display will prompt: Resistance Function RTD OHMS Select the RTD function using the INC/DEC keys and press ENT.
desired simulated temperature. The display readout will reflect the actual temperature being simulated at the terminals as the calibrator adjusts its output to compensate for errors and drift. When the display indicates the selected temperature, the output is properly set to simulate the requested RTD. The RTD simulation requires that the unit under test supply a nominal .1 to 2 milliamp test current.
To simulate ohms: The Model 230/235 calibrator can simulate Ohms directly. This may be useful if the RTD does not conform to a standard curve or if the actual resistance in Ohms is needed. To select the Ohms output function, press the RTD/Ω key while the calibrator is in the output mode. (On the 230 press the Ω key). The 235 display will prompt: Resistance Function RTD OHMS Select the Ohms function using the INC/DEC keys and press ENT. The Model 230/235 calibrator will prompt for the desired output in Ohms.
polarity of the current is significant and is the same as the voltage terminals, i.e., red is positive. If the test current is of the incorrect polarity, the calibrator will display REVERSED. Simply reverse the leads at the calibrator or the devise under test. Ramp Function The ramp function provides an output ramp with adjustable rate and amplitude for volts, millivolts, and thermocouples. Before a ramp can be generated, select one of these output types.
The next display will be: Sel Input Func Ohms Volts If enable is selected, the next display will prompt to select Volts or Ohms as the input. Once this selection is made, the calibrator will set the end point and the start point. The next display will be: Volts 0.00 RampRdy xxxxxx Press the INC key to initiate the ramp from the starting value. Press the DEC key to initiate the ramp from the ending value. If the trip detect is enabled, you must press the INC or DEC key twice.
Calculate the ramp time to achieve a desired resolution using this formula. ramp time = (ending value – starting value) (step size x 4) Auto Mode This function continuously repeats the calibration points or output ramp programs. If the ramp function is active when the AUTO key is pressed the ramp function is cycled continuously. If trip detect was enabled, it is canceled by the auto mode. If the ramp function is not active, then the CalPts are cycled repeatedly.
When the OPT Key is pressed for the first time after the calibrator is powered on, the calibrator reads the configuration and calibration data from the attached module. The first time the OPT Key is pressed, a series of messages is displayed listing the configuration of the module. The first display is: 20ma/10V output module The top line shows that a 20 Milliamp/10 Volt Output module is attached to the calibrator.
Enter the desired current in milliamps and press ENT. If an improper or out of range value is entered, the calibrator will display an error message. If the value is within the 0-22 mA operating limits, the calibrator will set the output to the requested value. The output displayed is the set point – not the actual output. To generate a voltage output, press the V key while the calibrator is in the output mode. (Note: the module should not be used for mV).
All of the output features such as Auto, CalPts and Ramp are available for use with the module. Ohm/RTD Module (Optional) The OHM/RTD Module allows output simulation of 1 to 900 Ohms by using the calibrator input to set the pots on the Module. Plug the umbilical from the Module into the Ohms input of the Model 230/235 calibrator and select 4-wire Ohms input. Move the switch on the Module to the Set position and set the desired output using the coarse and fine pots.
The LPS is designed to turn itself ON and OFF automatically, based on current demand. When a series loop exists at the LPS Loop Power jacks calling for .5 milliamps or greater the LPS will automatically 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 calibrator.
Application Notes Calibration of mV to Current Converters This example assumes a 10 to 50 mV input and a 4 to 20 mA output. 1. Connect as shown in Figure 1. 2. Select mA input. 3. Select mV output. 4. Enter 10 mV and adjust converter zero for 4 mA output. 5. Enter 50 mV and adjust converter span for 20 mA output. 6. Repeat steps 4 and 5 until both zero and span are within desired tolerance.
Calibration of Thermocouple 2-Wire Transmitter 1. Connect the calibrator as shown in Figure 2. 2. Select mA input. 3. Select TC output. 4. Select the TC type. 5. Select the appropriate temperature scale. 6. Enter the “zero” temperature. 7. The calibrator will now simulate the millivolt output of the selected thermocouple at the “zero” temperature. 8. While observing the milliamp input current in the left-hand side of the display, adjust the unit under test for 4 mA output. 9.
Calibrating Thermocouple 2-Wire Transmitter Red Wire Thermocouple Transmitter INPUT + - TC Wire OUTPUT + - Power Supply Figure 2 Application Notes 230/235 61
Calibrating RTD to current 2-Wire Transmitters RTD Transmitter INPUT Internal OUTPUT + - Power Supply + - Figure 3 Refer to page 59 for “typical” set up and operation.
Measuring Temperature with 3-Wire Platinum RTDs Same Color Wires RTD Temperature Element Internal Figure 4 Application Notes 230/235 63
Calibration of an Alarm Using Ramp and Trip Detect This example describes calibration of a thermocouple input alarm circuit. The calibrator should be connected as shown in Figure 5. The connection to the alarm contacts on the alarm circuit can be made across either the NO or NC contacts since the calibrator is simply looking for a change of state. This example assumes that the alarm should trip when the temperature exceeds 300 degrees and reset when the temperature falls below 275 degrees.
6. If the alarm trip point is not within the desired accuracy, adjust the alarm set point and repeat from step 2. 7. Press the DEC key to ready the ramp at its ending (400°) value. 8. Press the DEC key again to start the Ramp. 9. Wait for the alarm to reset. The input display will again display “tripped” and the Ramp will be stopped. 10. If the alarm release point is not within the desired accuracy, adjust it and repeat from step 7.
mA/V Module The module provides a powered 4-20 mA output signal for calibrating the inputs to 4-20 mA controllers and indicators. This mode is used to calibrate instruments that are not providing the loop power. Figure 6 shows the module connected to an instrument that is not providing loop power. Equipment configuration may require that a loop be calibrated with the loop power supply energized.
mA/V Module Instrument Being Calibrated + Internal Dropping Resistor Milliamp Module Figure 6 Max 48V + Rtn Milliamp Module Com Loop Power Supply Figure 7 Application Notes 230/235 67
Pressure Module The following examples show typical uses for the Pressure Module. Figure 8 shows a typical connection for calibrating a mechanical gauge.
Calibrating Loop Transmitter Powered Differential Pressure Figure 9 shows a typical connection for calibrating a loop powered differential pressure transmitter with a Model 230/235. In this configuration, you would measure milliamps and pressure simultaneously by pressing OPT with the calibrator in the output mode. A suitable power supply can be constructed from two 9 volt batteries in series.
Transmitter Calibration Using Loop Power Supply (LPS) Instrument Under Test 24VDC 4-20mA + Loop Power Supply (LPS) Stored in Pouch Loop Power Connection - LO HI Vent to Atmosphere Special mA Connection Hand Pump Pressure Module Pressure Connection 1/8” FNPT Figure 10 Application Notes 230/235 70
Error Messages Entered value is out of range The value entered is outside of the allowable range for the current output function. Check the specifications for the function being used to determine the allowable range of values. Expecting ENTER CE or INC/DEC The only keystrokes that are acceptable at this time are the ENTER, CE, INC or DEC. Expecting ENTER or CE/CANCEL The only keystrokes that are acceptable at this time are the ENTER or CE (interpreted as Cancel).
Input section fatal error det The input section of the calibrator has malfunctioned to the extent that the operation is not possible. Power the calibrator off and back on to reset the error. If the error persists the calibrator must be serviced. KEY not implemented You have pressed a key that has no meaning. No external module present You pressed the OPT key and there is no external module attached to the calibrator.
Unidentified err CalledBy ?????? An internal error has been detected by the calibrator firmware. Turn the calibrator off and back on to reset the error. If the problem persists, note the data in the lower right of the display and contact your service representative. Wrong access code entered You entered the wrong access code when attempting to change the owner’s name or accessing the manufacturing test menu. The access code for changing the owner name is found on the factory calibration sheet.
Service Information Return for Calibration, Recertification or Repair It is recommended that each calibrator be re-calibrated and/or recertified on an annual basis, and pressure modules re-calibrated 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 of the work requested and the exact address to which the unit should be returned.
Fuse Testing The calibrator employs fuses to protect the outputs and inputs in the event the calibrator is improperly connected to external circuitry. It is necessary to remove the covers in order to access the fuse panel. The following tests should be performed BEFORE removing the covers to determine if a fuse is actually blown. Fuse Type/ Location Input/ Output Fuse No. F1 Top PCB 230/235 Service Information Function Test mA Input Connect an ohmmeter across the input milliamps terminals.
Fuse Testing (continued) Fuse Type/ Location Input/ Output Fuse No. Model 230 F3 Model 235 F4 Function Test V/mV/ Ohms Output Place a 10K ohm resistor across the volts output terminals and jumper volts out to volts in. Select input volts and output volts and request 1V out. If the input and output both read zero, the fuse may be blown.
Fuse Replacement Should it become necessary to change a fuse, take the following steps: Read the following procedure fully and carefully before opening the case for fuse replacement. Damage to the keypad and/or keypad connector can occur if you do not follow these instructions. 1. Turn the calibrator OFF. 2. Remove the 4 screws located at the corners on the bottom of the unit. 3.
Fuse type 2AG 1/10 A 2AG 1 A 2AG 1/4 A Fuse F1 F3 F1 F2 Fuse F1 F4 F1 F2 5. Littelfuse PN 225.100 225001 225.250 Beta PN 904114-003 905002-001 905009-001 Location input/output input/output main power main power Model 230 Function mA input V/mV/Ω out Pri. Power Charger Type 2AG 1/10 A 2AG 1/4 A 2AG 1 A 2AG 1 A Location input/output input/output main power main power Model 235 Function mA input V/mV/Ω out Pri.
mA/V Module Service Information The module contains a single 2AG 1/4A fuse in the milliamp output circuitry. To determine if the fuse is blown, measure the voltage from the milliamp positive (red) terminal to the volts negative (black) terminal. A reading of 12V indicates that the fuse is good. To replace the fuse, the module should be unplugged from the calibrator and opened by removing the two screws in the case and separating the halves.
F1 F3 2AG 1/10 A 2AG 1/4 A F2 2AG 1/4 A Model 230 Input/Output Fuses Diagram F1 F4 2AG 1/10 A F3 2AG 1/4 A 2AG 1/4 A F2 2AG 1/4 A Model 235 Input/Output Fuses Diagram F1 2AG 1A F2 2AG 1A Main Power Fuses Diagram Service Information 230/235 80
Warranty Martel Electronics Corp. (Martel) devices are warranted to be free from all latent defects in material workmanship under normal use and service.
Specifications Input Specifications Function Volts Range 0-0.1 Vdc 0-1 Vdc 0-10 Vdc Resolution AccuracyB 1 µV ±0.005% RDG ±0.005A 10 µV ±0.005% RDG ±0.005A 100 µV ±0.005% RDG ±0.005A Max. Input: 30 Vdc mV 0-100 mVdc 0-1000 mVdc 0-10000 mVdc 1 µV 10 µV 100 µV ± 0.005% RDG ±0.005A ± 0.005% RDG ±0.005A ± 0.005% RDG ±0.005A mA 0-20 mA 0-50 mA 1 µA 10 µA ±0.005% RDG ±0.01A ±0.005% RDG ±0.01A 0-500 Ω 500-900 Ω 10 mΩ 10 mΩ ±0.025C ±0.
Thermocouples TC J K T E R/S B N G(4) C(5) D(6) L t M P A RangeA ResolutionA AccuracyA -210 to -151 -150 to 1200 -240 to -201 -200 to -101 -100 to 999 1000 to 1372 -250 to -201 -200 to -101 -100 to 400 -250 to -201 -200 to -101 -100 to 1000 -50 to 299 300 to 1768 100 to 199 200 to 499 500 to 999 1000 to 1820 -250 to -226 -225 to -101 -100 to 1300 150 to 3210 50 to 2310 50 to 2310 -200 to -151 -150 to 900 -200 to -101 -100 to 600 0 to 1310 0 to 1400 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.
Notes: 1. Temperature, resolution, and accuracy are in degrees Celsius. 2. Specifications are at 25°C +/- 10°C. 3. Range temperature coefficient is 10 PPM typical, 20 PPM max. from 0 to 15 and 35 to 50°C. 4. Tungsten vs. Tungsten-26% Rhenium. 5. Tungsten-5% Rhenium vs. Tungsten-26% Rhenium. 6. Tungsten-3% Rhenium vs. Tungsten-26% Rhenium. RTD Type 100 ohm Platinum (385 & 392 curve) 120 ohm Nickel Minco 10 ohm copper SAMA RC21-4-1966 Resolution 0.1°C AccuracyA ±0.25°C ±1 digit 0.1°C ±0.
Output Specifications Function Volts mV Ohms A B C Range 0-0.1 Vdc 0-1 Vdc Resolution 1 µV 10 µV AccuracyB ±0.005% RDG ±0.005A ±0.005% RDG ±0.005A 0-100 mVdc 0-1000 mVdc 1 µV 10 µV ± 0.005% RDG ±0.005A ± 0.005% RDG ±0.005A 0-25 Ω 25-400 Ω 400-1000 Ω .001 Ω .01 Ω .1 Ω ±0.025C ±0.025A ±0.025A % of full scale ± 1 digit. Accuracy stated at 25°C, traceable to NIST. % of full scale ±4 Digits.
Thermocouples TC J K T E R/S B N G(4) C(5) D(6) L t M P A RangeA ResolutionA AccuracyA -210 to -151 -150 to 1200 -240 to -201 -200 to -101 -100 to 999 1000 to 1372 -250 to -201 -200 to -101 -100 to 400 -250 to -201 -200 to -101 -100 to 1000 -50 to 299 300 to 1768 100 to 199 200 to 499 500 to 999 1000 to 1820 -250 to -226 -225 to -101 -100 to 1300 150 to 3210 50 to 2310 50 to 2310 -200 to -151 -150 to 900 -200 to -101 -100 to 600 0 to 1310 0 to 1400 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.
Notes: 1. Temperature, resolution, and accuracy are in degrees Celsius. 2. Specifications are at 25°C +/- 10°C. 3. Range temperature coefficient is 10 PPM typical, 20 PPM max. from 0 to 15 and 35 to 50°C. 4. Tungsten vs. Tungsten-26% Rhenium. 5. Tungsten-5% Rhenium vs. Tungsten-26% Rhenium. 6. Tungsten-3% Rhenium vs. Tungsten-26% Rhenium. RTD Type 100 ohm Platinum 385 curve Range Resolution Accuracy -185°C-850°C .1°C ±0.25°C ±1 digit 392 curve -180°C-630°C .1°C ±0.
General Input Impedance: Volts Millivolts Current >10 megohms >10 megohms 5 ohms nominal Output Impedance: Volts Millivolts <5 ohms <5 ohms Common Mode Rejection: Normal Mode Rejection: Input/Output Isolation: Battery Charge Time: Unit on Time: 80 db at 60 Hz 40 db at 60 Hz 100 megohms at 500Vdc 12-14 hours 7-8 hours typically Environmental Temperature: Operational Storage (w/Batteries) Humidity: 0°C to 50°C -20°C to 60°C 10% to 90% non-condensing Specifications subject to change without notice.
mA/V Module Specifications Function Volts mA Range 0-10 Vdc 0-20 mA Resolution 100 µV 1 µA Accuracy ±0.035% ±0.035% Accuracy is stated as a percent of full scale, ±1 digit, 15°C-35°C. Temperature coefficient is 0.002%/°C outside this range but within the operating temperature range.
Pressure Module Specifications Range 0-.3 psig 0-1 psig 0-5 psig 0-10 psig 0-15 psig 0-30 psig 0-50 psig 0-100 psig 0-300 psig 0-1000 psig 0-1500 psig 0-3000 psig 0-5000 psig Resolution .0001 .0001 .001 .001 .001 .001 .001 .01 .01 .1 .1 .1 .1 Accuracy .03%FS± .07%RDG ± 1 digit .03%FS± .07%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .02%FS± .05%RDG ± 1 digit .03%FS± .06%RDG ± 1 digit .03%FS± .
Media Compatibility 0 to 100 psi ranges vac & abs, clean, dry non-corrosive air or gases. 300 psig and higher ranges, non-corrosive liquids or gases, or other media that is compatible with 316 SS. Loop Power Supply Specifications Rechargeable Ni-Cd batteries (eight AA cells), 6 hours nominal @ 20 mA @ 25°C. Voltage: 24 Vdc +/- 5%. Battery Chargers 230/235 120 VAC to 5.8 Vdc @ 200 mA 220 VAC to 5.
Notes Specifications 230/235 92
Notes Specifications 230/235 93
Notes Specifications 230/235 94
Index A Application Notes, 59-70 Auto Key, 8 Auto Mode, 54 B BatSave, 20 Battery Charge Time, 88 Charging, 2 Check, 6 Save, 20 Bipolar Frequency Calibration, 55 Bipolar Output, 43 C Calibration Points Examples, 22 Function, 21 Utilizing, 23 Calibration System Manual Calibration, 16 Pressure Calibration, 14 CE/Zero Key, 8 CJunct, 24 Common Mode Rejection, 88 D Damp, 28 E Environmental, 88 Error % Display, 29 Error Messages, 71-73 mA/V Module, 73 External Compensation Module, 31 230/235 I-1
F Fuse Replacement, 77 Testing, 75 Type, 78 G General Description, 1 General Specifications, 88 H Humidity, 88 I Inc/Dec Key Function, 7 Program, 20 InpRdg, 28 Input Dampen readings, 28 Functions, 32-44 Impedance, 88 Isolation, 88 Milliamps, 32, 82 Millivolts, 32, 82 Ohms, 34 Percent of Scale, 44 Pressure Module, 36 Readings as % of scale, 28 RTD, 34, 84 Selection, 5 Specifications, 82 Thermocouple, 33, 83 Volts, 32, 82 Input Impedance, 88 Introduction, 1-2 230/235 I-2
K Keys Auto, 8 CE/Zero, 8 Inc/Dec, 7 Option, 9 % Key, 10 Ramp, 10 Setup, 19 SYS Key, 10 L LCD Vu, 20 Loop Power supply, 57, 70 Specifications, 91 LPS, 57 M mA/V Module, 54, 66 error messages, 73 Humidity, 89 Loop Resistance, 89 Loop Voltage, 89 Service, 89 Specifications, 89 Temperature, 89 Manual Calibration Using Calibration System, 16 Manufacturing test routines, 27 Menu Selection, 6 Mfg Test, 27 Milliamps, 32 Millivolts Input, 32 Output, 45 Min-Max Mode, 43 mV to Current Converters, 59 Specifications
N Normal Mode Rejection, 88 O Ohm/RTD Module, 57 Ohms, 34 Simulation, 49, 51 Operation, 3-31 Operator Setup, 19 Option Key, 9 Output Auto Mode, 54 Functions, 45-58 Impedance, 88 Isolation, 88 mA/Volt Module, 54 Millivolts, 45-46, 85 Ohms, 85 Ramp Function, 52 RTD, 87 RTD/OHMS, 49 Selection, 5 Thermocouple, 46, 86 Volts, 45, 85 Output Impedance, 88 mA/V Module, 89 Output Specifications, 85 Owner Enter name, 25 P Pause Time, 27 % Error Display, 29 % Key, 10 Percent of Scale, 23, 44 Power On Sequence, 3 Pres
Pressure Module, 68-69 Description, 36 Disconnected, 40 Electrical Connection, 36 Media Compatibility, 37, 91 Over Pressure, 90 Pressure Connection, 36 Safety, 41 Zeroing a gauge, 39 Zeroing an absolute, 40 R Ramp, 64 Ramp Function, 52 Ramp Key, 10 Return Authorization, 74 RTD, 34 3-wire Platinum, 63 Simulation, 49 RTD to 2-Wire Transmitter, 62 S Save Setup values, 28 Serial Interface, 27 SerIf, 27 Service Information, 74-81 Setup, 19 Enter owner’s name, 25 Save values, 28 Specifications, 82-91 Temperatur
T Temperature Operating, 88 Storage, 88 Temperature Compensation Module, 31 Thermocouple, 33 Cold/Reference Junction compensation, 24 Simulation, 46 2-wire Transmitter, 60-61 Trip Detect, 41, 64 U Unit on Time, 88 V Viewing Angle, 20 Volts Input, 32 Output, 45 230/235 I-6
Temperature Calibrator Model 235 ON OFF BAT CK CE ZERO 7 8 9 4 5 1 .
