Heavy Duty Pitot Tube Anemometer and Differential
Pressure Manometer
Model HD350
Introduction
Congratulations on your purchase of the Extech HD350. This handheld meter measures and
displays air velocity (speed), air flow (volume), ambient air temperature, and gauge/differential
pressure. This meter is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service.
Features
Pitot tube Anemometer measurements for Air Velocity and Air Flow (volume).
Manometer (Differential Pressure) Measurements.
Simultaneous display of Air Flow or Air Velocity, Temperature, and Pressure.
5 selectable pressure units of measure.
Record up to ninety-nine (99) readings (in meter’s internal memory) for each of the three
measurement types (Air Velocity, Air Flow, and Pressure) for a total of 297 readings.
USB port for connection to a Personal Computer (PC) for real time datalogging of up to 5500
readings stored on the PC.
Large backlit LCD display.
Data Hold and Maximum, Minimum, Average memory (MIN/MAX/AVG).
Auto Power OFF (can be disengaged).
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Meter Description
1. Pitot tube. Hold the tube in the flow of air to take a reading
2. Pressure Manometer hose 1 Black
3. Pressure Manometer hose 2- White
4. Pressure Connector (+)
5. Pressure Connector (-)
6. Temperature sensor
7. LED display shows readings, units,
setup parameters, and user alerts
8. PC interface jack: Use the supplied
cable to connect the meter to a PC
9. Upper Keypad:
F/C : Press to change the unit of
measure for Temperature. Also
functions as an up arrow key
UNIT : Press to change the unit of
measure for Pressure, Air Velocity,
and Air Volume (Flow). Also functions
as a down arrow
AVG / REC: Used to obtain the
Average for multi-point measurements
in either FLOW or VELOCITY modes.
Up to twenty (20) points can be
averaged. Press and hold this button
for 3 seconds to access the data Recall mode (REC)
SETUP : Momentary key presses turn the backlight on and off. Press and hold this button for 3
seconds to enter or exit the Setup mode (discussed later in this guide)
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10. Lower Keypad:
MAX/MIN: Press to record and store the highest, lowest and continuous moving average readings
for single point measurements. Press and hold this button to exit this function
SAVE / CLEAR: Press to store a reading. In recall mode, pressing this button clears a data
sample.
P/V/F: Press to select Pressure (P), Air Velocity (V), or Air Flow (F)
HOLD / ZERO: Momentary presses freeze and un-freeze the displayed reading. Press and hold
the button to ZERO (OFFSET) the displayed reading
11. On/Off button: Press to turn the meter ON or OFF
KEYPAD NOTE: In Setup mode several buttons have special uses not detailed above but are
described in subsequent sections of the manual.
NOTE: Battery Compartment, Tilt Stand, and Tripod Mount are located on the reverse side of the
meter.
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Display Description
1. Elapsed timer display units (min:sec or hour:min)
2. Pressure, Velocity, Flow and Temperature
mode indicators
3. Primary Measurement Display
4. Units of measure for air velocity
5. Units of measure for pressure
6. Indication that the meter is communicating
with the PC
7. Auto Power Off mode indicator
8. Low battery indicator
9. Duct Shape indicator
10. Data Hold indicator
11. Height/Width (rectangular duct) or Diameter
(circular duct)
12. Setup mode indicator
13. CLEAR icon appears as data is deleted from
the meter’s internal memory
14. Reading (sample) number
15. Memory indicator
16. REC, MAX, MIN and AVG indicators
17. Temperature units for the primary display
18. Units of measure for air flow
19. Temperature units for the secondary display
20. Secondary display (Temperature)
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Setup Mode
Changing Setup Options
The Setup mode is used to select the shape/dimensions of an air duct for Air Flow Measurements,
engage/disengage Sleep mode (auto power OFF), hide/view measurement types, and selectively
delete (clear) readings from the 99-location internal memory. The meter stores these settings in its
internal non-volatile memory.
Setup Options
Option Menu item Settings
Air Duct dimension units Unit
Air Duct Shape Duct Shape Rectangle or Circular duct symbol
Air Duct Area DECI/99999
Meter Configuration (select
the measurement parameters
to use; the others will be
hidden)
Auto Power Off (Sleep) mode SLEEP ON or OFF
Delete Stored readings ALL
Type
Entering or Exiting Setup
Press and hold the SETUP button for 2 seconds to enter or exit the Setup mode. When the meter is
in Setup mode, the display indicates ‘SETUP’.
Changing a Setup Option
Set duct dimension units to inches (‘in’)
or centimeters (‘cm’)
Decimal place and 5-digit number to
represent the area
Type 1 (show Pressure and Velocity)
Type 2 (show Velocity and Flow)
Type 3 (show all measurement types)
Use the SAVE/CLEAR button to
choose the reading type(s) to delete.
Select CLEAR to delete.
1. Use the ▲▼arrow keys to scroll through the setup options.
2. Press the AVG REC button when the desired setup parameter is displayed.
3. Use the arrow keys to scroll to the desired setting.
4. Press the AVG REC button to store the new setting in memory.
Note: The Setup mode is disabled when the meter is in the MIN-MAX-AVG mode.
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