Martel-electronics 235 User Manual

MODEL 230/235 Temperature Calibrator User’s Guide

Input/Output Selection The Model 230/235 calibrator has a single set of function keys for controlling both input measurements and output s

Index A Application Notes, 59-70 Auto Key, 8 Auto Mode, 54 B BatSave, 20 Battery Charge Time, 88 Charging, 2 Check, 6 Sa

F Fuse Replacement, 77 Testing, 75 Type, 78 G General Description, 1 General Specifications, 88 H Humidity, 88 I Inc/Dec

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 Pow

N Normal Mode Rejection, 88 O Ohm/RTD Module, 57 Ohms, 34 Simulation, 49, 51 Operation, 3-31 Operator Setup, 19 Option Key, 9 Outpu

Pressure Module, 68-69 Description, 36 Disconnected, 40 Electrical Connection, 36 Media Compatibility, 37, 91 Over Pressure, 90

T Temperature Operating, 88 Storage, 88 Temperature Compensation Module, 31 Thermocouple, 33 Cold/Reference Junction compensation,

Beta Model 235 Calibrator See front cover for Model 230 Temperature Calibrator Model 235 ON OFF BAT CK CE ZERO % V mV mA

Menu Selection The Model 230/235 calibrator has several functions that require additional information once the function has been selec

voltage falls below 4.65 volts, a warning message is displayed is displayed approximately every minute. When the voltage falls bel

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 unti

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 O

If the module is not capable of operating in the mode requested, an error message will be displayed. The operation of the Pressure Module

If no tags have been entered, the display will indicate: If calibration is complete, the display will indicate “Pass” or “Fail” instead

If “Review” was selected, the test points would be displayed. Press the INC/DEC keys to scroll through additional points. Press ENT or CE to ret

step the calibrator output through the calibration points. Once the desired results are achieved, press AUTO as indicated on the calibrator display.

If “Done” is selected, the calibrator will prompt “Test Finished” and the operator will be prompted to enter his/her ID number. The operator wil

Beta Model 230 Calibrator See back cover for Model 235 Temperature Calibrator Model 230 ON OFF BAT CK CE ZERO V mV mA 7 4 1 .

If the instrument being calibrated has a pressure output, no special action is required during the automatic test. The pressu

When READY is being displayed, the applied pressure is within tolerance. You should wait until the actual pressure readings stabilize and th

If the input to the instrument cannot be generated by the calibrator, the calibrator will be configured for Manual output. An example migh

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 E

Operator Setup The SETUP key activates the operator setup mode. This allows the operator to preset several convenience features to

LCD Vu (Adjust LCD viewing angle) The LCD viewing angle or contrast may be adjusted electronically for optimum viewing under various co

current scale or a user defined calibration point from a predefined list of calibration points. This feature allows the user to program th

the last calibration point is entered, the next screen will be: Enter the value in engineering units for the function you will be using that rep

Example #2: Programming a 3 point calibration for a 0-10mV input to a recorder. The calibration points entered would be: cal point #1 0

The first prompt will be for the functions that require a percent of scale. Enter a new value or just press ENT to retain the

Table of Contents Introductions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 General Description

The internal temperature compensation is performed by a semiconductor temperature sensor located next to the thermocouple output termina

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

Pause (Set pause time for auto CalPts and Ramp) The AUTO key will cause the Calibration Points or Ramp program to repeat continuously wit

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 t

Select either Enable or Disable using the INC/DEC keys and press the ENT key. % Error Display This option allows the user to con

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 th

To display the 235 input and output in % ERR and % Scale units, press the % Key. Subsequent presses of the % key, will toggle the 235 be

Input Functions Input functions are selected by pressing any of the function keys while the calibrator is in input mode. Functions available

TC (Thermocouples) The Model 230 calibrator supports 11 thermocouple curves, JKTERSBNCGD. The Model 235 calibrator supports 15 thermoco

begin making thermocouple measurements and display the readings on the left-hand side of the display. The top line of the display contains i

Output Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Volts/Millivolts . . . . . . . .

The 235 display will prompt: Select OHMS using the INC/DEC keys and press ENT. The Model 230/235 calibrator will display a prompting menu asking f

calibrator will prompt for the type of connection: 2-wire, 3-wire, or 4-wire. Select the type of connection you will be using and press E

thread lubricant should be used when making the connection to prevent seizing or galling. Media Compatibility The Pressure Module is de

appear. This menu allows the selection of engineering units for pressure display. The choices are displayed 4 at a time. Scrolling past t

The Pressure Module is capable of operating as an input or output function, even though it is a measurement only device. This a

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

Safety Good safety practices should always be followed when using high pressures. Although liquids are considered non-compr

The trip detect feature can utilize either the volts or 2-wire ohms input terminals. If the alarm circuit has powered contacts, the volts

After the trip occurs, the input display shows: To restart the ramp and reset the trip condition, press either the INC or DEC key once to re

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

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Input Specifications . . . . .

Output Functions Output functions are selected by pressing any of the function keys while the calibrator is in output mode. Output fu

achieved at all times. The internal microprocessor will automatically correct for any drift due to temperature or battery change. Millivolt

Select the type of thermocouple you will be using and press ENT. The calibrator will prompt for the temperature unit to use. Select the proper tem

OBSERVE THERMOCOUPLE POLARITY. THE RED V/TC TERMINAL OF THE CALIBRATOR IS THE POSITIVE TERMINAL. The calibrator should be connected to the device u

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, 12

desired simulated temperature. The display readout will reflect the actual temperature being simulated at the terminals as the cali

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

polarity of the current is significant and is the same as the voltage terminals, i.e., red is positive. If the test current is

The next display will be: If enable is selected, the next display will prompt to select Volts or Ohms as the input. Once this selectio

Calculate the ramp time to achieve a desired resolution using this formula. ramp time = (ending value – starting value) (step size

Introduction General Description The Model 230/235 Temperature Calibrators are compact, versatile, functionally styled calibrators. Thes

When the OPT Key is pressed for the first time after the calibrator is powered on, the calibrator reads the configuration and calibration

Enter the desired current in milliamps and press ENT. If an improper or out of range value is entered, the calibrator will display an erro

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 allow

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

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

Calibration of Thermocouple 2-Wire Transmitter 1. Connect the calibrator as shown in Figure 2. 2. Select mA input. 3. Select TC output. 4. Sel

Calibrating Thermocouple 2-Wire Transmitter Figure 2 Application Notes 230/235 61 INPUT

Calibrating RTD to current 2-Wire Transmitters Figure 3 Refer to page 59 for “typical” set up and operation. Applicati

Measuring Temperature with 3-Wire Platinum RTDs 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

Battery Charging Units are shipped with the internal batteries in an uncharged state. The calibrator battery charger is a wall plug-in type (se

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 t

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 u

mA/V Module Figure 6 Figure 7 Application Notes 230/235 67 + - Milliamp Modu

Pressure Module The following examples show typical uses for the Pressure Module. Figure 8 shows a typical connection for calibrating a mec

Calibrating Loop Powered Differential Pressure Transmitter Figure 9 shows a typical connection for calibrating a loop powered different

Transmitter Calibration Using Loop Power Supply (LPS) 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

Input section fatal error det The input section of the calibrator has malfunctioned to the extent that the operation is not possible. Pow

Unidentified err CalledBy ?????? An internal error has been detected by the calibrator firmware. Turn the calibrator off and back on

Service Information Return for Calibration, Recertification or Repair It is recommended that each calibrator be re-calibrated and/or recerti

Operation The Model 230/235 Temperature Calibrators are user friendly and menu driven. A first time user can normally start operat

Fuse Testing The calibrator employs fuses to protect the outputs and inputs in the event the calibrator is improperly connected to external

Fuse Testing (continued) Service Information 230/235 76 Fuse Type/ Location Fuse No. Function Test Input/ Output Model 230 Mo

Fuse Replacement Should it become necessary to change a fuse, take the following steps: 1. Turn the calibrator OFF. 2. Remove the 4 screws loc

Fuse type Littelfuse PN Beta PN 2AG 1/10 A 225.100 904114-003 2AG 1 A 225001 905002-001 2AG 1/4 A 225.250 905009-001 Model 230 Fuse Location Functio

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

Model 230 Input/Output Fuses Diagram Model 235 Input/Output Fuses Diagram Main Power Fuses Diagram Service Informatio

Warranty Martel Electronics Corp. (Martel) devices are warranted to be free from all latent defects in material workmanship under normal use

Specifications Input Specifications Function Range Resolution AccuracyB Volts 0-0.1 Vdc 1 µV ±0.005% RDG ±0.005A 0-1 Vdc 10 µV ±0.005% RDG ±0.005A

Thermocouples TC RangeA ResolutionA AccuracyA J -210 to -151 0.1 1 -150 to 1200 0.1 0.5 K -240 to -201 0.1 2 -200 to -101 0.1 1 -100 to 999 0.1 0.5

Notes: 1. Temperature, resolution, and accuracy are in degrees Celsius. 2. Specifications are at 25°C +/- 10°C. 3. Range temperature coefficie

This indicates the date in MMDDYY format of the last factory calibration. The example indicates the Model 230/235 was calibrated on

Output Specifications Function Range Resolution AccuracyB Volts 0-0.1 Vdc 1 µV ±0.005% RDG ±0.005A 0-1 Vdc 10 µV ±0.005% RDG ±0.005A mV 0-100 mVdc

Thermocouples TC RangeA ResolutionA AccuracyA J -210 to -151 0.1 1 -150 to 1200 0.1 0.5 K -240 to -201 0.1 2 -200 to -101 0.1 1 -100 to 999 0.1 0.5

Notes: 1. Temperature, resolution, and accuracy are in degrees Celsius. 2. Specifications are at 25°C +/- 10°C. 3. Range temperature coefficie

General Input Impedance: Volts >10 megohms Millivolts >10 megohms Current 5 ohms nominal Output Impedance: Volts <5

mA/V Module Specifications Function Range Resolution Accuracy Volts 0-10 Vdc 100 µV ±0.035% mA 0-20 mA 1 µA ±0.035% Accuracy is stated as a per

Pressure Module Specifications Range Resolution Accuracy 0-.3 psig .0001 .03%FS± .07%RDG ± 1 digit 0-1 psig .0001 .03%FS± .07%RDG ± 1 digit 0-5 psig

Media Compatibility 0 to 100 psi ranges vac & abs, clean, dry non-corrosive air or gases. 300 psig and higher ranges, non-corrosive liquid

Notes Specifications 230/235 92

Notes Specifications 230/235 93

Notes Specifications 230/235 94