Honeywell Mini-AT, User Manual, Page: 72 / 156

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Page 72
Mini-AT User Guide
5) After the temperature has stabilized, write down the temperature from the calibrated thermometer.
6) Reinstall the temperature probe into the thermowell and allow the temperature to stabilize.
7) Compare the Mini-AT's live temperature reading to the temperature from the calibrated thermometer.
If the temperature readings are within tolerance, proceed to step 12.
8) If the Mini-AT's live temperature is greater than the calibrated thermometer's temperature, press the
DOWN button on the Mercor Mini Field Calibrator until they agree. If the Mini-AT's live
temperature is lower than the calibrated thermometer's temperature, press the UP button until they
agree.
9) Press the ENTER button to 'lock-in' the temperature reading. Note; The Mini-AT's LCD will go
blank for a second while the instrument is computing the new T-Zero value. When completed, the
LCD will return to a live temperature display and further adjustments are possible, if needed.
10) If the two readings are within tolerance, no further adjustments are needed, proceed to step 12.
11) If the two readings are outside an acceptable tolerance, consider the most appropriate action listed
in step 6 of
Single-Point Temperature Calibration (Defined).
12) Use the mag wand to return the instrument to the Corrector Mode.
13) Unplug the Field Calibrator cable from the main board connection J2.
The above procedure compared the Mini-AT's live temperature to the temperature of a calibrated
thermometer. If the readings are within tolerance, the temperature calibration could be assumed
sufficient. However, any of the above procedures should be subject to individual gas company policies.