HD300 Datasheet, PDF (3/13 Pages) Extech Instruments Corporation. – Heavy Duty CFM-CMM Thermo-Anemometer

Meter Description
1. LED display for Air Velocity, Air Flow, Probe
Temperature, and remote surface
temperature. Units of measurement and user
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alerts are also displayed on the LCD.
2. Vane Sensor. Hold the sensor in the flow of
air to take a reading.
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3. IR sensor: Non-contact temperature
measurement for remote surfaces.
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4. Laser Pointer: Helps the user aim the IR
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sensor.
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5. Battery access: Cover on rear panel
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6. PC interface jack: Use the supplied cable to
connect meter to a PC
7. Upper Keypad (brief descriptions below):
IRT: Press and hold to measure remote surface temperature. Release to hold the
temperature value on the display.
MAX/MIN (for air temperature measurements): Used to record and store the
highest and lowest readings for temperature measurements made by the vane
probe.
AVG: Used to obtain Average for multi-point measurements in either FLOW or
VELOCITY modes. Up to twenty (20) points can be averaged.
HOLD (for air temperature measurements): Press to freeze the displayed
temperature reading measured by the probe. Press again to unlock the display.
Press and hold for 2 seconds to activate the LCD backlight. Press and hold again
for 2 seconds to turn the backlight off.
8. Lower Keypad
On/Off button : Press to turn the meter ON or OFF
MAX/MIN (for air velocity and air flow): Press to record and store the highest,
lowest and continuous moving average readings for single point measurements.
This button also functions as the decimal positioning tool in the AREA mode.
C-F UNITS : Press to select the mode of operation and unit of measure. In FLOW
mode, the meter displays air volume. In VELOCITY mode, the meter displays air
speed. This button also functions as the UP arrow button in AREA mode.
AREA / NEXT: Press and hold to enter the AREA mode. The NEXT function allows
the user to save AREA values to any of eight memory locations. This button is also
used to clear stored readings in the MAX/MIN/AVG modes.
HOLD (for air velocity and air flow measurements) Backlight: Press to freeze
the displayed air velocity or air flow reading. Press again to unlock display. This
button also functions as the right arrow button in the AREA mode.
NOTE: Battery Compartment and Tripod Mount are located on the reverse side of the meter
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HD300 V2.0 11/07