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https://www.lakeshore.com/240/
Model 240 Quick Start Guide
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
W
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 connectors 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.
NOTE:
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 module. 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:
For Cernox® reading 1.8K, choose Sensor
Simulator – NTC
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.
NOTE:
If the switch is set to PLATINUM when the Sensor
Simulator – NTC curve is loaded, the temperature
displayed will be approximately 400 K. If the switch is
set to CERNOX when the LSCI PT-100 curve is loaded,
the input module will report an S.Over error since the
resistance value is greater than the 1 kW limit for a PTC
sensor.
