HD500 Datasheet, PDF (4/10 Pages) Extech Instruments Corporation. – Heavy Duty Psychrometer + IR Thermometer

Operation
Basic Measurements
1. Press the button to turn power on.
2. The upper display will indicate Air Temperature, Wet Bulb Temperature or Dew Point
Temperature and % Relative Humidity.
Press the WB/DP button to toggle between Air, WB or DP.
3. The lower display will indicate Type K temperature or IR Temperature.
Press and hold the IRT button to select the IR Thermometer.
The TYPE-K function will display “-------“ if a type k probe is not inserted into the meter.
4. Press the °C/°F button to change the temperature units from °C or °F.
Non-contact IR Surface Temperature Measurements
The built-in IR sensor can remotely measure the temperature of most
surfaces. The Laser pointer allows the user to aim accurately when taking
non-contact measurements.
1. Turn ON the meter using the button.
2. The IR sensor and laser pointer are located at the top of the meter.
3. Point the sensor toward the surface to be measured.
4. Press and hold the IRT button to begin measuring the surface
temperature of a desired target. IR TEMP and will appear on the
display. The laser pointer will switch on to help aim the meter.
5. The measured IR surface temperature will appear on the lower display.
6. When the IRT button is released, the laser pointer will switch off and the
reading will freeze (data hold) on the display for approximately 7
seconds.
7. After the 7 second hold time the meter returns to the type k mode.
WARNING: Do not directly view or direct the laser pointer at an eye. Low power
visible lasers do not normally present a hazard, but may present some potential for
hazard if viewed directly for extended periods of time.
Data Hold
1. Press the HOLD buttons (one for upper display and one for lower display) to freeze the
displayed value for the respective display. Press again to unlock the display.
2. The HOLD icon will appear on the display when the Data Hold mode is active.
4
HD500 V3.1 12/07