User's Manual
Model 407112
Heavy Duty Vane Thermo-Anemometer
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Introduction
Congratulations on your purchase of Extech's Heavy Duty Anemometer. The Heavy Duty
Anemometer is an instrument used for measuring the speed (velocity) at which air is flowing.
Extech's vane anemometers indicate air flow in five units of measure: Feet per minute,
Meters per second, Miles per hour, Kilometers per hour, Knots.
Vane anemometers use a remote wheel that freely rotates in response to air flow. In addition
to air velocity, Extech's Vane Anemometers measure temperature in both Centigrade and
Fahrenheit via a built in thermistor.
Specifications
Circuit Custom LSI microprocessor circuit.
Display Dual function , 13 mm(0.5") Super large 1999 count LCD
Measurement units m/s, km/h, ft/min, knots , mph, Temp.- OC, OF.,
Data hold Retain reading in display
Sensor Structure Air velocity sensor :Conventional twisted vane arms and low -
Memory Recall Records Max, Min and Average readings with RECALL.
Power off Auto shut off saves battery life, or manual off by push button.
Data Output RS 232 PC serial interface.
Operating Temp.
(instrument only)
Operating Humidity Max. 80% RH.
Power Supply 006P DC 9V battery (Heavy duty type).
Power Current Approx. DC 8.3 mA.
Weight 0.84 LB / 381 g (included batteries & probe)
Size Main instrument: 7.1 x 2.8 x1.3 inch (180 x 72 x 32 mm)
Accessories Instruction manual, Sensor probe
Air Velocity Specifications
Measurement Range Resolution Accuracy
ft/min (feet/min) 80 - 4921 ft/min 1 ft/min ± (2% + 20ft/min)
m/s (meters/sec) 0.4 - 25.0 m/s 0.1 m/s
km/h (kilometers/hour) 1.4 - 90.0 km/h 0.1 km/h
mph (miles/hour) 0.9 - 55.9 mph 0.1 mph
knots (nautical miles/hour ) 0.8 to 48.6 knots 0.1 knots
Temperature Specifications:
Range (probe only) Resolution Accuracy +/32OF to 122OF / 0OC to 50OC 0.1OF / 0.1OC 1.5OF / 0.8OC
display with contrast adjustment for best viewing angle.
friction ball-bearing design. Temperature sensor :Precision
thermistor.
0 °C to 50 °C (32 °F to 122 °F).
Sensor Head: Round, 72 mm diameter
(% of full scale)
± (2% + 1d)
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Meter Description
yellow
1. LCD Display
2. Keypad
3. Battery compartment (rear)
4. Sensor input socket
5. RS232 output socket
6. Vane sensor
7. Protective holster
Operation
1. Install the "Sensor Plug" into the "Sensor Input Socket.
2. Press "Power Off/On" to turn the instrument power "ON".
3. Select the temperature units by pressing "°C/ °F ". The
display will indicate "°C" or "°F" as selected.
4. Select the air velocity units by pressing "Unit" , The display
will indicate "m/s", "km/h", "ft/min", "knot", or "mile/h" as
selected.
5. The meter will now display the current temperature and air
velocity.
Note: For maximum accuracy in temperature measurements,
the yellow dot on the vane should be facing the direction of the air flow.
dot
airflow
Data Hold:
During the measurement, pressing "Data Hold" will hold the displayed value and the
LCD will display the "D.H" indicator. Press "Hold" again to release the data hold
function.
Data Record (MAX/MIN/AVG Readings)
When selected, the DATA RECORD function records and stores the maximum,
minimum and average readings. To start the DATA RECORD function:
a) Press "RECORD" once. The "REC" indicator will appear on the display.
b) Press "RECALL" once to retrieve the "Max" reading. The "Max" indicator along with
the maximum values will appear on the LCD display.
c) Press "RECALL" once, the "Min" indicator along with the minimum values will
appear on the LCD display.
d) Press "RECALL" once, the "AVG" indicator along with the average values will
appear on the LCD display.
e) To disable the "Data Record " function, press "Record" again. The display
indicators "REC", "Max", "Min", "AVG" will disappear.
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Measurement Considerations
1. The meter is designed with an "Auto shut off" feature to save battery life. The
power will automatically shut off if no function button is pressed in any 10 minutes
period. To disable "Auto shut off" while taking measurements, press "RECORD"
and engage the record function.
2. The volume of air flowing through a duct or vent can be determined by taking the
area of the duct in square units (i.e. square feet) and multiplying this value by the
measured linear velocity ( i.e. feet per minute). This gives: ft/min x ft2 = ft3/min
(CFM)
Battery replacement
The low battery indication appears as a "LBT" on the left corner of the display. When the
"LBT" appears, replace the battery as soon as possible. Reliable readings can be
obtained for several hours after the first appearance of the low battery indication. To
replace the battery:
1 Remover the meter's rubber protective holster.
2 Pry the Battery Cover off using a small coin or screwdriver and remove the battery.
3 Replace the 9V battery (heavy duty type) and reinstall the cover.
4 Make sure the battery cover is secured after changing the battery.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be
performed on an annual basis to insure calibration integrity.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for three years from date of shipment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument for service during or beyond the warranty
period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization. A Return
Authorization (RA) number must be issued before any product is returned to Extech. The sender is
responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit.
This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring,
operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to
repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,
whether written or oral, is expressed or implied.
Copyright © 2001 Extech Instruments Corporation. All rights reserved including the
right of reproduction in whole or in part in any form
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Useful Equations and Conversions
(
Area equations
Cubic equations
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Units Conversion Table
1 m/s 1 196.87 1.944 3.6 2.24
1 ft/min 0.00508 1 0.00987 0.01829 0.01138
1 knot 0.5144 101.27 1 1.8519 1.1523
1 km/h 0.2778 54.69 0.54 1 0.6222
1 MPH 0.4464 87.89 0.8679 1.6071 1
m/s ft/min knots km/h MPH
W
A = W x H
H
R
A = pi x R
2
RS232 PC Interface
The meter has a RS232 serial data port. This interface was designed to operate with the
Extech Data Acquisition Software (p/n 407000) and enables the user to capture, store
and display readings on a PC. For more information, contact Extech or refer to the
407000 user's manual for details on the PC interface.
Tech Support Hotlines
781-890-7440 ext. 200
extech@extech.com
www.extech.com
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