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CHAPTER 4: Configuration
4.3.6 Evaluation Kit
(optional)
240 Series Input Module
The evaluation kit includes two unique accessories for the 240 Series input module
that will help simulate a live sensor connection if one is not readily available for your
evaluation testing.
Sensor simulator: A box containing a trimpot (variable resistor) that is similar to the
Cernox temperature range, to be used as a rough approximation of these sensors. This
product can be useful if you'd like to see how the 240 Series input module handles
communicating and displaying a particular temperature range, or if you'd like to see
how the 240 Series input module autoranges. Follow these steps to use the sensor
simulator:
1. Connect the sensor simulator to the desired input of the 240 Series input module
using the pluggable connector.
2. In MeasureLINK™, choose the correct input.
3. Under Sensor setup, select Standard Curve and pick Sensor Simulator – NTC from
the drop down list.
4. Make any other changes to the input configuration needed for your application,
and then disconnect from MeasureLINK™.
5. Adjust the dial to change the temperature to coincide with the markings on the
sensor simulator box.
The accuracy rating of the trimpot is 10%, so the measured resistance and temperature
value may not align exactly with the markings on the dial. Please do not use the sensor
simulator as a method for verifying accuracy of the 240 Series input module.
Fixed resistor board: A small PCB containing two different fixed resistors that
correspond with an arbitrary Cernox sensor at approximately 1.8 K and a 100
platinum sensor at approximately 65 K. The evaluation kit contains enough of these
boards for both the 2 and 8 input modules included in the kit so that valid readings
can be easily obtained on all inputs. Follow these steps to use the fixed resistor board:
1. Insert one of the fixed resistor boards into one of the 5-pin sensor input connec-
tors provided with the 240 Series input module. Locate the board so that the
switch is on the same side as the screw heads on the terminal connector.
2. Screw down the terminal connections so that the terminals contact the metal
traces on the fingers of the fixed resistor board.
The fingers can be fragile. Please handle the assembled set by the terminal connector
when connecting and disconnecting to the 240 Series input module.
3. Plug the terminal connector into the desired input of the 240 Series input mod-
ule. The switch should face toward the front of the module.
4. In MeasureLINK™, choose the correct input.
5. Under Sensor Setup, select the sensor you wish to simulate from the drop down
list under Standard Curve:
D For Cernox reading 1.8K, choose Sensor Simulator – NTC.
D For Platinum reading 65 K, choose LSCI PT-100.
6. Make any other changes to the input configuration needed for your application,
and then disconnect from MeasureLINK™.
7. Set the switch on the fixed resistor board to CERNOX if you loaded the Sensor
Simulator – NTC temperature curve. Set the switch to PLATINUM if you selected
the LSCI PT-100 curve instead.
If the switch is set to PLATINUM when the Sensor Simulator – NTC temperature curve is
loaded, the temperature displayed will be approximately 400 K. If the switch is set to
CERNOX when the LSCI PT-100 temperature curve is loaded, the input module will report
an S.Over error since the resistance value is greater than the 1 k limit for a PTC sensor.
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