Electronic sensor check
Performing an electronic sensor check
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A verification module, Quest model 053-923, may be used to check the operation of the
QUESTemp’s wet bulb, dry bulb, and globe. The purpose is to verify that the electronic
components are within a specific range with known values and a know n sour ce. T he
temperature tolerances should be within +/-0.5oC.
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NOTE: If the sensors are outside of the tolerances, this indicates the sen sor alignment
should be serviced off-site for calibration.
Performing an electronic sensor check
1. Ensure the instrument is reading in Celsius prior to your electronic sensor check.
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To change the temperature setting, select Setup from the main menu. Then,
either Fahrenheit or Celsius will appear on the screen. When selected, press I/O enter
key to switch between settings. For more information, please refer to Operating, page
10.
2. Remove the top sensor bar, place to the side, and plug in the verification module into th e
center pins of the sensor housing.
3. Verify the measurement readings on the screen are within +/- 0.5°C tolerance to the
readings printed on the verification module label. Example below:
a. Wet Bulb (WB) – 11.1°C b. Dry Bulb (DB) - 45.3°C
c. Globe (G) – 69.2°C
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NOTE: Relative humidity (RH) is not valid on this instrument.
4. Once completed, remove verification module and place sensor bar back on the instrument.
(Tighten down the two bolts.) Change the Celsius reading bac k to Fa hrenhe i t. ( Refer t o
step 1 a-b.)
Electronic Sensor
check
Example of Verification module