Patent No. 6,766,028 - OFI Testing Equipment, Inc.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 47
Appendix
Thermocouple
Calibration
In order to calibrate the thermocouple properly, the temperature units on the
viscometer must be set to Celsius. If the unit is set to Fahrenheit, change it
to Celsius before calibrating:
1. Press SET UP
2. Press NEXT 6 times. The displays should now read “Temperature
Units:”
3. Enter 1
4. Press ENTER, then CLEAR/STOP to return to the main screen.
To calibrate the thermocouple, compare the temperature reading of the
thermocouple to that of a calibrated thermometer at ambient temperature and
100°C. Then set the temperature offset and slope on the Model 900. This
process only applies to rmware version 1.43 and later.
1. Press SET UP.
2. Press 600 3 times.
3. Press NEXT 11 times. The display should now read “TC Offset”.
4. Enter 0 and press ENTER.
5. Press NEXT. The display should now read “TC Slope”.
6. Enter 1
7. Press ENTER, then CLEAR/STOP to return to the main screen.
8. With the thermocouple and calibrated thermometer in air, record the
temperature reading from the Model 900 display. This value will be
M1. Record the temperature on the calibrated thermometer as A1.
9. Place the thermocouple and calibrated thermometer into a heat
source at 100°C. Record the reading from the Model 900 display as
M2 and the calibrated thermometer as A2.
10. Calculate the slope and offset using the following equations:
Slope = (A2 - A1) / (M2 - M1)
Offset = (A1 / Slope) - M1
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