Operator’s Manual: ThermoJet
Chapter 10: THJ80 Command Set
© SP Industries, Inc.
200-31974-999 Rev. 009
68
Calibration Introduction
The temperature control system has undergone a two-phase calibration process. The first phase
occurs at the point of manufacture of the temperature control circuit boards. The second phase
occurs during the Quality Control procedure after assembly into the final unit and prior to
shipment.
At FTS, the calibration device of choice is and Omega Calibration Thermometer, Model CL26
T.C.-RTD-
Σ
.
A calibrator with similar specifications may be used.
If your facility has not established its own internal policy concerning calibration of temperature
control instrumentation, it is recommended that the temperature controller calibration procedure
outlined below be performed on a semi-annual basis.
Temperature Calibration
The ThermoJet temperatures are calibrated by first setting a 0.0°C offset and then individual high
and low temperature gains. To accomplish this, the air temperature thermocouple (or the DUT
thermocouple) input must be connected to a calibration EMF source. Referring to the
Temperature Calibration screens, (Fig. 49-51), follow the detailed instructions that follow.
NOTE:
The calibration process should be performed buy a qualified technician and
completed for both the air temperature thermocouple and DUT thermocouple.
Nozzle Air Calibration
1. With the system under Nozzle control, go to the Utilities screen, then Temperature Calibration.
2. The Air Calibration Warning screen will appear (Fig. 49) and prompt for a continuation. Press
“Yes” to continue to the Air Temperature Calibration screen.
3. A message “Wait until the nozzle temperature is stabilized at 25°C before removing the nozzle
TC” appears.
4. Once the nozzle temperature is stabilized, the Air Calibration screen will appear. If the nozzle
thermocouple is disconnected before the system is stable an “Open Thermocouple Alarm” will
occur.
5. Connect a precision temperature calibration device to the #1 female thermocouple jack on the
electrical box.
6. Set the precision temperature calibrated device to 0.0°C.
7. Adjust the offset so the Calibrated Temperature value is equal to 0.0°C. Press the “Offset” button
and entering the offset value into the displayed keypad (e.g., Temperature calibrator reads 0.0°C
and the Uncalibrated temperature reads -3.0°C, enter 3.0°C as the offset).
8. Adjust calibrator setpoint to -55°C (or any other low temperature value).
9. Calculate the lower limit gain by dividing the calibrator setpoint value by the value in the
calibrated temperature field. Enter this value into the Lower Limit Gain box (e.g., Temperature
calibration reads -55 and Calibrated temperature reads -54.6. Enter 1.0073 into Lower Limit Gain
field).
10. Adjust calibrator setpoint to 125°C (or any other upper temperature value).
11. Adjust upper limit gain by dividing the calibrator setpoint value by the value in the calibrated
temperature field. Enter this value into the Upper Limit Gain box (e.g., Temperature calibration
reads 125 and Calibrated temperature reads 126. Enter 0.9921 into Upper Limit Gain field).
12. Reconnect the nozzle air thermocouple before returning to the Utilities Screen or proceeding to
the DUT Temperature screen.
13. Press Exit.
14. Press Exit to accept warning (Fig. 44).
The system nozzle air temperature calibration is now complete.
