Infrared Thermometer
Typical Measurements
•If system pressure has been increased above design settings, this can result in symptom of trap failure (stuck open). Check steam pressure.
1.Press Dand then press Ato select HI emissivity for black iron pipe and painted traps.
2.Press Cand then press Ato select DIF.
3.Aim the Thermometer at the steam pipe.
4.Scan steam pipe upstream of trap.
5.Scan the steam trap. Scan downstream of trap on condensate return side.
6.Press Cand then press Aand toggle to MIN, MAX, and DIF temperatures. Record your readings.
Measuring Grille, Register, or Diffuser Discharge Temperature
1.Press Dand then press Ato select HI emissivity.
2.Aim the Thermometer at the discharge air grille, register, or diffuser.
3.Measure discharge temperature.
4.Release the trigger to freeze the temperature reading for 7 seconds and record the temperature.
5.Grille, register, or diffuser temperature should be equivalent to discharge temperature at the air handler.
6.Drill a sample hole in supply duct at air handler.
7.Connect thermocouple probe to Thermometer.
8.Insert thermocouple probe, such as the
9.Read supply air temperature on the secondary display.
10.Compare supply duct temperature to discharge air temperature. They should be nearly equivalent. If they are not, check for duct leakage or insulation problems.
11.Patch the sample hole.
Verifying Thermostat/Room Sensor Accuracy
1.Insert the thermocouple probe into the Thermometer. Record ambient air temperature.
2.Press Dand then press Ato select HI emissivity.
3.Press Cand then press Ato select DIF.
4.Aim the Thermometer at the wall thermostat.
5.Compare the wall temperature reading to thermostat cover temperature and thermocouple air temperature reading.
6.Look for possible source of heat or heat sink that could be affecting thermostat accuracy.
7.The temperature of the thermostat cover and surrounding wall surfaces should be very nearly equivalent (DIF reading should be close to 0).
Checking for Blockage in
1.Remove panels to gain access to coil return bends or hairpins.
2.Press Dand then press Ato select LO emissivity for copper tube.
3.Start the refrigeration system.
4.Aim the Thermometer at coil return bends/hairpins.
5.Start recording temperature.
6.Take temperature of each return bend/hairpin.
•All evaporator return bends/hairpins should be at or slightly above evaporator saturation temperature from the pressure/temperature chart.
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