Calibration Loop; Calibration Procedure - Thermo Scientific ULT-80 Installation & Operation Manual

Calibration Loop

The Calibration Loop is used to calibrate the RTD high and low temperature.
The controller's internal temperature sensor is factory calibrated. We recom-
mend calibrating any external sensor.
Enter the Calibration Loop from the Operator's Loop by pressing and holding
the NO key while pressing the YES key three times.
Calibration
Procedure
Install a calibrated reference thermometer in the bath. (For external mode,
also install the sensor in the bath.) Place the cover on the circulator.
The procedure uses the Operator's, Setup and Calibration Loops. In the
Setup Loop place the circulator in either the internal or remote RTD mode of
operation (RTD1 = Internal , RTD2 = External). Return to the Operator's
Loop and adjust the setpoint to an appropriate high-end temperature.
NOTE: When calibrating the external sensor ensure the controller's
SENSOR indicator is illuminated.
Once the bath reaches the setpoint and stabilizes, go to the Calibration Loop
and, as illustrated on the next page, enter the actual reference thermometer
reading at either the r1H or r2H prompt.
Store the change and return to the Operator's Loop. Adjust the setpoint to
an appropriate low-end temperature. Once the bath reaches the setpoint and
stabilizes, return to the Calibration Loop and enter the reference thermometer
reading at either the r1L or r2L prompt. Store the change.
Do not pick points that are outside the safe operating limits of the
circulator and the fluid in your application.
Analog In calibration is done by applying a 10.000Vdc signal for AiH, and a
0.000Vdc signal for AiL. Reference the appropriate pins on the ACCESSORY
connector.
Analog Out calibration is done by measuring the appropriate pins on the
ACCESSORY connector. Adjust the AoH to 1.000Vdc using the YES and NO
keys then press ENTER twice. Adjust the AoL to 0.000Vdc using the YES
and NO keys then press ENTER twice.
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