Predictive Thermometer Verification And Calibration Calibration
5 - 16 0070-10-0691 Accutorr Plus Service Manual
5.6 Predictive Thermometer Verification And Calibration
The Water Bath Method, utilizes laboratory grade stirred water bath to confirm that the
PTM is operating within the specified limits.
In case of failure or inaccuracy of readings, the System Calibration Procedure may be
followed to re-adjust the device to factory specifications.
This procedure requires high accuracy test equipment and therefore it is not recommended
for field calibration. A comprehensive factory service program to support this product is
available.
5.6.1 Water Bath Method
1. Prepare a water bath set to 89.6 to 110.0°F as a temperature reference. Confirm
temperature with a separate precision thermometer.
2. Snap a protective sheath onto the temperature probe, and immerse into the reference
water bath for 30 seconds, or until the temperature display stops flashing. Record the
temperature shown on the temperature display.
5.6.2 Temperature Verification Test, Infrared Thermometer (Applicable
Only To Units Equipped With A Temperature Option)
1. Pre-heat water bath to 100°F. Place floating Black Body device into water bath and
allow to stabilize until step 7, or a minimum of 30 seconds.
2. Prepare the thermometer for the verification process, by removing any disposable
probe covers. Clean the probe lens with a swab dipped in alcohol.
3. Completely cover probe tip with a piece of aluminum foil, from the lens to the probe
neck portion. Allow 5 minutes for the probe and foil to stabilize at ambient
temperature.
4. Activate the thermometer, by pressing the button. Read the ambient temperature
displayed and record the number as T
A
=____.
5. Remove the aluminum foil.
6. Check the water bath temperature against a laboratory grade mercury thermometer,
with a verified accuracy of 0.4 °F (0.2 °C) or better. Record the water bath
temperature as TT=____.
7. Attach a disposable probe cover to the thermometer head. Insert the head into the
floating Black Body cavity, such that the instrument is looking into the needle shaped
end.
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