USER MANUAL
CFM/CMM Thermo Anemometer
Model AN100
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Introduction
Congratulations on your purchase of the Extech AN100 CFM/CMM Thermo Anemometer. This
instrument measures Air Velocity, Air Flow (volume) and Temperature. The large, easy-to-read
backlit LCD includes primary and secondary displays plus numerous status indicators. The
meter is shipped fully tested and calibrated and with proper use will provide years of reliable
service.
Descriptions
1. LCD Display
2. Vane Probe
3. Rubber Meter Jacket
4. Meter
5. Power On/Off Button
6. Area Button
7. AVG (Average) Button
8. Backlight Button
9. Temperature Buttons (see 11 & 12)
10. Airflow/Velocity Buttons (see 13 - 16)
11. MAX-MIN button for TEMPERATURE mode
12. °C °F units and HOLD for TEMPERTAURE functions
13. MAX-MIN button for AIR VELOCITY/AIR FLOW (also used as left arrow button)
14. UNITS for AIR VELOCITY/AIR FLOW mode (also used as up arrow button)
15. HOLD for AIR VELOCITY/AIR FLOW mode (also used as right arrow button)
16. NEXT button for AIR VELOCITY/AIR FLOW mode
See next section for additional keypad description information.
Battery compartment is located on rear of instrument, rubber meter jacket must be removed to
access battery compartment
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Keypad
• AUTO POWER OFF Press to turn the meter ON or OFF
• MAX/MIN (for Airflow/Air Velocity) Used to record and store the highest, lowest and average
airflow or velocity readings.
◄ (LEFT) also serves as change decimal point button in AREA mode
• UNITS Press to select the mode of operation. In FLOW mode, the meter displays air volume. In
VELOCITY mode, the meter displays air speed.
▲(UP) also serves as increase number button in AREA mode.
• AVG Used to Average multiple readings in FLOW or VELOCITY mode. Up to 20 readings can be
averaged.
• HOLD Press to freeze the displayed reading. Press again to unlock display. This button also
functions as the ►RIGHT scroll button in AREA mode and RECALL mode.
• AREA Press and hold to manually enter the area of a duct in CFM or CMM mode
• NEXT In AREA mode, used to select memory locations 1-8.
• Press to turn the backlight on/off
• MAX/MIN (Temperature) Used to record and store the highest, lowest readings for air
temperature.
• °C °F HOLD (Temperature) Press to freeze the displayed temperature reading. Press again to
unlock the display. Press and hold for 3 seconds to switch between °C and °F. Meter will beep
twice to indicate change.
The Battery compartment is located on the back of the instrument. The rubber protective jacket
must be removed from the meter to access the compartment.
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Display
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
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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
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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 m2 or 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.
airflow
Arrow
Side view of Vane
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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.
Data Hold (Air Velocity/Air Flow)
1. While taking measurements, press the HOLD button to freeze the air velocity/air flow
reading.
2. The HOLD 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 (AVG)
readings.
1. Press the Airflow/Velocity MAX/MIN button. The MAX indicator and RECORD
indicator along with the Max reading will appear on the LCD display and the meter will begin
keeping track of the MAX, MIN and Average values.
2. Press the MAX/MIN button again to view the minimum reading. The MIN indicator along
with the minimum reading will appear on the LCD display.
3. Press the MAX/MIN button again to view the average reading. The AVG indicator along with
the average reading will appear on the LCD display.
4. Press the MAX/MIN button again to display current readings. NOTE: the meter will keep
recording MAX/MIN/AVG readings.
5. To clear and stop MAX/MIN/AVG recording and return to normal operation, press and hold
the MAX/MIN button until the meter beeps twice.
Automatic Power OFF
The meter automatically turns off after 20 minutes. To defeat this feature:
1. Turn the meter OFF.
2. Press and hold the (Backlight) key while turning the meter ON.
3. “dis APO” will appear in the display. The AUTO POWER OFF feature will now be disabled.
4. Note that AUTO POWER OFF is re-enabled each time the meter is turned on.
5. Also note that AUTO POWER OFF is disabled in CFM/CMM or Average mode.
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Battery Replacement
When appears on the LCD, the 9V battery must be replaced.
1. Disconnect the sensor.
2. Remove the meter’s rubber protective jacket
3. Use a Phillips screwdriver to open the rear battery compartment
4. Replace the 9V battery
5. Close the battery compartment and replace the meter’s protective jacket
Safety: Please dispose of batteries responsibly and never dispose of batteries in a fire, batteries
may explode or leak. When storing the meter for 60 days or more, remove the battery and store
separately.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection
sites, the retail store where the batteries were purchased, or wherever batteries are
sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take endof-life devices to a designated collection point for the disposal of electrical and electronic
equipment.
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place
and fastened securely.
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Specifications
Air Velocity
Range
Resolution
Accuracy (% of reading)
m/s (meters per sec)
0.40 - 30.00 m/s
0.01 m/s
± (3%rdg + 0.20 m/s)
km/h (kilometers/hour)
1.4 - 108.0 km/h
0.1 km/h
± (3%rdg + 0.8 km/hr)
ft/min (feet per minute)
80 – 5900 ft/min
1 ft/min
± (3%rdg + 40 ft/m)
mph (miles per hour)
0.9 – 67.0 mph
0.1 mph
± (3%rdg + 0.4 MPH)
knots (nautical MPH)
0.8 to 58.0 knots
0.1 knots
± (3%rdg + 0.4 knots)
Air Flow
Range
Resolution
Area
CMM (cubic meters/min)
0-9999 m3/min
1
0 to 9.999m2
CFM (cubic ft/min)
0-9999 ft3/min
1
0 to 9.999ft2
Air Temperature
Range
Resolution
Accuracy
-10 - 60oC (14 - 140oF)
0.1oC/F
±2.0oC (4.0oF)
Circuit Custom LSI microprocessor circuit
Display Dual function 13 mm (0.5") 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 0°C to 50°C (32°F to 122°F)
Storage Temperature -10 to 60oC (14 to 140oF)
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)
Power Consumption 8.3 mA DC approx.
Weight 725g (1.6 lbs) including battery & probe
Dimensions Main instrument: 178 x 74 x 33mm (7.0 x 2.9 x1.2")
Sensor Head: 70mm (2.75”) Inside Diameter
Sensor Head: 76.2mm (3.0”) Outside Diameter
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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 (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Radius
Area (A) = π x r2
Where π= 3.14 and r2 = radius x radius
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