VersaPro Temperature Controller
Page 46
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Calibration of the Thermocouple Input
Calibration procedure:
1. Connect terminals TB-B 1, 2 to an isolated, stable millivolt source calibrator using standard copper wire, 20
AWG is sufficient.
2. Set the calibrator output to 0.00 mV.
3. Activate the calibration mode by entering the SETUP menus, selecting the Calibration menu and changing
Calibration IN - NO to YES.
4. Use the Enter key to select the TC ZERO mode.
5. Using the arrow keys, adjust the displayed value to equal the calibrator input.
6. Press the Enter key to select the TC SPAN mode.
7. Set the calibrator output to 50.0mV (70mV maximum).
8. Using the arrow keys, adjust the displayed value to equal the calibrator output.
Calibration of the Cold Junction Temperature
Calibration procedure:
1. Change the millivolt source calibrator to thermocouple mode with internal cold junction compensation.
Change the copper wire with the correct thermocouple extension wire
2. Set the calibrator to a typical temperature level.
3. Use the Versapro Enter key to advance to the CJ Adjustment display.
4. Using the arrow keys, adjust the displayed value to equal the calibrator input.
Ref to the following tables for the valid range of thermocouple inputs that can be used to calibrate the cold
junction compensation.
Table 12
Thermocouple
Calibration Values
T/C type
Minimum
Value °F (°C)
Maximum Value
°F (°C)
B
800 (426)
3000 (1800)
E
-454 (-270)
1832 (1000)
J
32 (0)
1300 (900)
K
32 (0)
2300 (1200)
N
32 (0)
2300 (1200)
R
300 (150)
3000 (1800)
S
300 (150)
3000 (1800)
T
32 (0)
700 (350)
The usable ranges for the thermocouple types are shown in the following table. If it is desirable to have a
higher accuracy over a specific operating range then the input should be calibrated over that range.
