3M 44, 46 user manual Electronic sensor check, Performing an electronic sensor check

Electronic Sensor

check

Electronic sensor check

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 known source. The temperature tolerances should be within +/-0.5oC.

Example of Verification module

•NOTE: If the sensors are outside of the tolerances, this indicates the sensor 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.

•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 the 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

•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 back to Fahrenheit. (Refer to step 1 a-b.)