Operation; Powering The Meter; Air Temperature And Relative Humidity Measurements; Wet Bulb And Dew Point Temperature Calculations - FLIR EM54 User Manual

4. Operation

4.1 Powering the Meter

The meter is powered by one 9V battery (rear compartment). Long press the power
button to switch the meter ON or OFF. The EM54 has an APO Sleep utility that
switches the meter OFF automatically after the programmable APO time has elapsed.
See the Setup mode for instructions on setting the sleep mode (SLP) APO timer.

4.2 Air Temperature and Relative Humidity Measurements

1. Temperature and RH sensors are located at the tip of the meter
2. Long press the power button to switch the meter ON
3. Short press the VEL|TEMP|TYPE-K button to step to the Air Temperature mode
(TEMP). The upper digits show the reading; short press
4. Short press the %RH|FLOW button to select RH for display on the lower digits
5. If a measurement is out of range, the display will show 'OL' or '-OL'.

4.3 Wet Bulb and Dew Point Temperature Calculations

Wet Bulb and Dew Point Temperature calculations are based on air temperature and
relative humidity measurements.
1. Long press the power button to switch the meter ON
2. Short press the WB|DP button to toggle Wet Bulb (WB) and Dew Point (DP)
temperature modes. The upper digits show the reading

4.4 Type-K Thermocouple Measurements

Caution: Note the temperature range limit printed on the thermocouple connector (or verify the
range with the manufacturer). The supplied probe cannot be used to measure temperature
through the entire range listed in the specification section; measuring temperature beyond the
range printed on the thermocouple connector can damage the probe and the meter.
1. Connect a Type-K thermocouple sub-miniature plug
(shown here) to the jack in the meter's right-side
compartment.
2. Short press VEL|TEMP|TYPE-K to step to the TYPE-K mode
3. Touch the thermocouple probe tip to the surface under test or hold in air; the upper
display digits show the reading. Short press
4. If the thermocouple is not connected to the meter when the Type-K mode is
selected, the display will show dashes
5. If a temperature measurement is out of range, the display will show 'OL' or '-OL'.
6. See the Setup mode section for setting a temperature display offset, if desired
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