User's Manual
CFM/CMM Thermo Anemometer
Model AN100
AN100-EU V3.0 11/072
AN100-EU V3.0 11/073
Display Layout
MAX (top of LCD): Max Hold function engaged for the Air Temperature function
HOLD (top of LCD): Data Hold function engaged for the Air Temperature function
VEL: indicates that meter is in air velocity mode
FLOW: indicates that meter is in air flow mode
MAX (bottom of LCD): Max Hold for the IR Temperature and RH function
HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function
o
C /oF: Temperature units of measure
CFM/CMM: airflow units of measure
Ft2, m2: units for area dimensions
m/s, ft/min, km/h, MPH, knots: air velocity units of measure
X10, X100: multipliers for air flow readings
AVG: air averaging mode
RECORD: indicates that min/max function is running (top for temp, bottom for air)
Large LCD digits at center of display for Relative Humidity and IR Temperature
Smaller LCD digits at top, right of display for Probe Temperature
: Low battery indicator
AN100-EU V3 .0 11/074
Operation
Connecting the Vane
1. The vane plug is inserted in the meter’s sensor jack at the top of the meter. The plug
and jack are keyed so that the plug can only fit in the jack one way.
2. Turn the plug carefully until it lines up with the jack and then firmly push the plug in
place. Do not apply undue force or try to twist the plug side-to-side.
3. If the vane is not connected to the meter or if the sensor is defective, the LCD display
will indicate OL in place of a Temperature reading.
Air Velocity Measurements (Single Point)
1. Turn on the meter using the ON/OFF button.
2. Press UNITS button to select the desired unit of
measure. NOTE: At power up the meter will
display the last unit of measure previously
entered.
3. Place the sensor in the air stream. Ensure that
the air enters the vane as indicated by the arrow
sticker placed inside the vane.
4. View the readings on the LCD Display. The
large main LCD display shows the Air Velocity
reading. The upper right LCD sub-display shows
the temperature reading.
Air Velocity Averaging Mode
1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice.
The AVG icon will be displayed.
2. Take a measurement and press the AVG button. A single beep will sound and the
HOLD icon will appear in the display.
3. The average reading will be displayed and number of readings measured will appear in
the upper right hand corner of the display. After 5 seconds, the display will return to the
current reading.
4. Repeat steps 2 - 3 until the desired number of points have been measured.
5. To return to standard velocity measuring mode press and hold AVG button until meter
beeps twice.
Note: In the standard velocity measuring mode, press the AVG button once to recall the
previous average. The average will be cleared when you enter the Averaging Mode
again.
airflow
Arrow
Side view of Vane
AN100-EU V3 .0 11/075
Air Flow Measurements (CMM / CFM)
1. Turn on the meter using the ON/OFF button
2. Press the UNITS button to select the desired air flow
units: CMM (cubic meters per minute) or CFM (cubic
feet per minute). NOTE: At power up the meter will
display the last unit of measure previously entered.
3. To begin entering the area in m2or ft2, press and
hold the AREA button until it beeps twice. The
leftmost digit of the bottom display will begin to flash.
4. Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits.
After all of the digits are entered, press and hold the
AREA button (until meter beeps twice) to save the area into memory and return to
CFM or CMM measuring mode.
5. Place the sensor in the air stream. Ensure that the air enters the vane as indicated by
the arrow sticker placed inside the vane. Refer to the diagram. The large main LCD
display shows the Air Velocity reading. The upper right LCD sub-display shows the
temperature reading.
The meter has 16 memory locations (8 for CFM and 8 for CMM) that can be used to store
commonly used area sizes that you can recall at anytime.
1. Press the AREA button until meter beeps twice. A memory location number will
appear in the top right of the display indicating the memory location.
2. Push the NEXT button to scroll thru and select the desired location. Once you have
selected the desired memory location enter your dimension
Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits. After all of the digits are entered,
press and hold the AREA button (until it beeps twice) to save the area into memory
and return to CFM or CMM measuring mode.
To select and use a previously stored dimension, press and hold the AREA button until it
beeps twice.
Press NEXT to scroll thru the 8 memory locations. Press and hold the AREA button until it
beeps twice to return to CFM or CMM measuring mode.
Air Flow Averaging Mode
1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice.
The AVG icon will be displayed.
2. Take a measurement and press the AVG button. A single beep will sound and the
HOLD icon will appear in the display.
3. The average reading will be displayed and number of readings measured will appear in
the upper right hand corner of the display. After 5 seconds, the display will return to the
current reading.
4. Repeat steps 2 - 3 until the desired number of points have been measured.
5. To return to standard airflow measuring mode press and hold AVG button until meter
beeps twice.
Note: In the standard velocity measuring mode, press the AVG button once to recall the
previous average. The average will be cleared when you enter the Averaging Mode
again.
airflow
Arrow
Side view of Vane
AN100-EU V3 .0 11/076
Data Hold (Air Velocity/Air Flow)
1. While taking measurements,presstheHOLD button to freeze the air velocity/air flow
reading.
2. TheHOLD indicator will appear in the bottom of the LCD display.
3. Press HOLD again to return to normal operation.
MAX/MIN/AVG Record (Air Velocity/Air Flow)
This allows the user to record and view the highest (MAX), lowest (MIN) and average
AN100-EU V3 .0 11/077
Battery Replacement
When appears on the LCD, the 9V battery must be replaced.
1. Disconnectthesensor.
2. Remove themeter’s rubber protectivejacket
3. Use a Phillips screwdriver to open the rear battery compartment
4. Replace the9Vbattery
5. Close the battery compartment and replace the meter’s protective jacket
You, as the end user, are legally bound (Battery ordinance) to return all used
batteries and accumulators; disposal in the household garbage is prohibited!
You can hand over your used batteries / accumulators, gratuitously, at the
collection points for our branches in your community or wherever batteries /
accumulators are sold!
Disposal
Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in
place and fastened securely.
NOTE:: If your meter does not work properly, check the fuses and batteries to make sure that
they are still good and that they are properly inserted.
AN100-EU V3 .0 11/078
Specifications
Air Velocity Range Resolution Accuracy
m/s (meters per sec) 0.40 - 30.00 m/s 0.01 m/s ± (3% + 0.20 m/s)
km/h (kilometers/hour) 1.4 - 108.0 km/h 0.1 km/h ± (3% + 0.8 km/hr)
ft/min (feet per minute) 80–5900 ft/min 1 ft/min ± (3% + 40 ft/m)
mph (miles per hour) 0.9 – 67.0 mph 0.1 mph ±(3% + 0.4 MPH)
knots (nautical MPH) 0.8 to 58.0 knots 0.1 knots ± (3% + 0.4 knots)
Air Flow Range Resolution Area
CMM (cubic meters/min) 0-9999 m3/min 1 0to 9.999m
2
CFM (cubic ft/min) 0-9999 ft3/min 1 0 to 9.999ft
2
Air Temperature Range Resolution Accuracy
14 - 140oF (-10 - 60oC) 0.1oF/C 4.0oF (2.0oC)
Circuit Custom LSI microprocessor circuit
Display Dual function 0.5" (13 mm) 4-digit LCD
Sampling rate 1 reading per second approx.
Sensors Air velocity/flow sensor: Conventional angled vane arms with
low-friction ball bearing
Temperature sensor: NTC-type precision thermistor
Automatic Power off Auto shut off after 20 minutes to preserve battery life
Operating Temperature 32°F to 122°F (0°C to 50°C)
Storage Temperature 14 to 140oF (-10 to 60oC)
Operating Humidity <80% RH
Storage Humidity <80% RH
Operating Altitude 2000 meters (7000ft) maximum
Battery One 9 volt (NEDA 1604) battery
Battery life 80 hours approx. (if the Backlight is used continuously, battery
life will be reduced significantly)
Battery Current 8.3mA DC approx.
Weight 1.6 lbs. (725g) including battery & probe
Dimensions Main instrument: 7.0 x 2.9 x1.2" (178 x 74 x 33mm)
Sensor Head: 2.75” (70mm) Diameter
Copyright © 2007 Extech Instruments Corporation
All rights reserved including the right ofreproduction in whole or in part in any form.
Useful Equations and Conversions
Area equation for rectangular or square ducts
Area equation for circular ducts
Cubic equations
NOTE: Measurements made in inches
must be converted to feet or meters
before using the above formulae.
Unit of Measure Conversion Table
m/s ft/min knots km/h MPH
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
Width (W)
Height (H
)
Area (A) = Width (W) x
Height (H)
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m
3
/min) = Air Velocity (m/sec) x Area (m2) x 60
Radius
Area (A) =
x r
2
Where = 3.14 and r2= radius x
HT30-EU-EN-V3.2--9/11
9
Phone: 01235 838 555
E-mail: cs@airconcern.co.uk
web: www.airconcern.co.uk
Air Concern Ltd, Building 173 Curie Avenue Harwell Didcot, Oxfordshire OX11 0QG
more info for Extech AN100
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