Extech Extech HD300-NIST Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech HD300 Product Info Page

User Guide

Heavy Duty CFM-CMM Thermo-Anemometer

With built-in non-contact IR Thermometer and Laser Pointer

Model HD300

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

Introduction

Congratulations on your purchase of the Extech HD300 CFM Thermo-Anemometer. This
handheld meter measures and displays air velocity, air flow (volume), temperature of air,
and surface temperature (using the built-in non-contact IR thermometer). This meter is
shipped fully tested and calibrated and, with proper use, will provide years of reliable
service.

Features

 CFM/CMM Thermo-Anemometer with built-in non-contact IR Thermometer

measures remote surfaces to 932°F (500°C) with a 30:1 distance to spot ratio and
Laser pointer.

 Simultaneous display of Air Flow or Air Velocity plus ambient temperature.
 Eight (8) memory locations permit the user to store multiple air duct AREA values

for fast and easy recall.

 Twenty (20) reading average for Air Flow or Air Velocity.
 Large backlit LCD display.
 3% velocity accuracy via low friction 2.83” (72mm) ball-bearing vane wheel on a

3.9’ (120cm) cable.

 Data Hold and Max/Min/Avg.
 Auto Power OFF (can be disengaged).

Safety

• Use extreme caution when the laser pointer beam is on

• Do not point the beam toward anyone's eye or allow the beam

to strike the eye from a reflective surface

• Do not use the laser near explosive gases or in other
potentially explosive areas

2

HD300 V2.0 11/07

Meter Description

1. LED display for Air Velocity, Air Flow, Probe

Temperature, and remote surface
temperature. Units of measurement and user
alerts are also displayed on the LCD.

2. Vane Sensor. Hold the sensor in the flow of

air to take a reading.

6
1

3. IR sensor: Non-contact temperature

measurement for remote surfaces.

4. Laser Pointer: Helps the user aim the IR

sensor.

5. Battery access: Cover on rear panel

7
5

8

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

43

2

 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 an d 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 / NE XT: 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

3

HD300 V2.0 11/07

Operation

Air Velocity Measurements

Side view of Vane

1. Connect the sensor to the sensor input jack on top of
the meter.

2. Turn ON the meter using the on-off

button.

Arrow

3. Select the VELOCITY function using the UNITS button.
Press the button repeatedly until the LCD displays

VEL.

airflow

4. Press and hold the UNITS button for 2 seconds (until
two tones are heard) to change the temperature units
from °C to °F or from °F to °C. The LCD will reflect the
selection.

5. Select the desired air velocity units using the UNITS
button. The LCD will reflect the selection.

6. Place the sensor in the air current to be measured with
the arrow on the inlet side of the vane (see diagram).

7. View the air velocity and temperature readings on the LCD Display.

Air Flow (Volume) Measurements (CFM / CMM)

1. Connect the sensor to the sensor input jack on top of the meter.

2. Turn on the meter using the on-off

button.

3. Select the FLOW mode using the UNITS button. Press the button repeatedly until the
LCD displays FLOW CFM (cubic feet per minute) or FLOW CMM (cubic meters per
minute) as desired.

4. Measure the dimensions of the duct or vent in question and calculate the area in
square feet or square meters

Note: If the dimensional measurements are made in inches (or cm), convert them feet (or

meters) before calculating the square area.

2

5. To begin entering the area in m

or ft2 press and hold the AREA button for approx. 2

seconds (until two tones are heard).

6. Momentarily press the NEXT button to select the desired memory location to store the
area value (there are eight locations).

7. Use the button to change the value of the flashing digit, use the button to
select another digit, and use the button to move the decimal point.

8. Press and hold the AREA button for approx. 2 seconds (until two tones are heard) to
save the area value in memory.

9. Place the sensor in the air current to be measured with the symbol on the inlet side of
the vane.

10. View the air flow and temperature readings on the LCD Display.

11. If the CFM or CMM reading exceeds 9999, the display will show the X10 or X100
multiplier in the lower right hand corner of the LCD indicating that the displayed value
must be multiplied by 10 or 100 to arrive at the correct flow measurement value.

4

HD300 V2.0 11/07