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USER MANUAL Extech AN100 CFM/CMM Mini Thermo Anemometer
Extech AN100-NIST CFM/CMM Mini Thermo Anemometer
CFM/CMM Thermo Anemometer Model AN100 CFM/CMM
Thermo-Anemometer
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 2
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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. 3
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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

CFM/CMM: airflow units of measure

2
2
Ft , m : 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 C / oF: Temperature units of measure
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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.
Side view of Vane
Arrow
airflow
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. 5
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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.
2
Side view of Vane
Arrow
airflow
2
3.
To begin entering the area in m or ft , 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. 6
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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. The MAX indicator and RECORD
1. Press the Airflow/Velocity MAX/MIN button.
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 Battery Safety Reminders o Please dispose of batteries responsibly; observe local, state, and federal regulations.
o Never dispose of batteries in a fire; batteries may explode or leak.
o Never mix battery types; install new batteries of the same type. WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely. 8
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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) Range Resolution Area Air Flow CMM (cubic meters/min) 0‐9999 m /min 1 0 to 9.999m2 CFM (cubic ft/min) 0‐9999 ft3/min 1 0 to 9.999ft2 Resolution Accuracy o
±4.0oF (2.0oC) Air Temperature 3
Range o
o
14 ‐ 140 F (‐10 ‐ 60 C) 0.1 F/C Circuit Display Sampling rate Custom LSI microprocessor circuit Dual function 0.5" (13 mm) 4‐digit LCD 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 Auto shut off after 20 minutes to preserve battery life 32°F to 122°F (0°C to 50°C) o
o
14 to 140 F (‐10 to 60 C) <80% RH <80% RH 7000ft (2000 meters) maximum One 9 volt (NEDA 1604) battery 80 hours approx. (if the Backlight is used continuously, battery life will be reduced significantly) 8.3 mA DC approx. 1.6 lbs (725g) including battery & probe Automatic Power off Operating Temperature Storage Temperature Operating Humidity Storage Humidity Operating Altitude Battery Battery life Power Consumption Weight Dimensions Main instrument: 7.0 x 2.9 x1.2" (178 x 74 x 33mm) Sensor Head: 2.75” (70mm) Diameter 9
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Warranty FLIR Systems, Inc. warrants this Extech Instruments brand device to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to 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 for authorization. Visit the website for contact information. A Return Authorization (RA) number must be issued before any product is returned. 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. FLIR Systems, Inc. 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. FLIR’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. Calibration, Repair, and Customer Care Services FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we sell. NIST certification for most products is also provided. Call the Customer Service Department for information on calibration services available for this product. Annual calibrations should be performed to verify meter performance and accuracy. Technical support and general customer service is also provided, refer to the contact information provided below. 10
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Garantie FLIR Systems, Inc. garantit que cet appareil Extech Instruments est exempt de défauts matériaux et de fabrication pendant un an à partir de la date d’envoi (une garantie limitée de six mois s’applique aux capteurs et aux câbles). Si le renvoi de l’appareil pour réparation devient nécessaire durant ou après la période de garantie, contactez le service client pour autorisation. Pour obtenir les coordonnées, visitez le site Web suivant. Un numéro d’autorisation de retour (AR) doit être délivré avant tout retour de produit. L’expéditeur prend à sa charge les frais d’expédition, le fret, l’assurance et l’emballage correct de l’appareil afin de prévenir toute détérioration durant le transport. Cette garantie ne s’applique pas aux dommages imputables à l’utilisateur, tels que l’usage impropre ou abusif, un mauvais câblage, une utilisation non conforme aux spécifications, un entretien ou une réparation incorrecte, ou toute modification non autorisée. FLIR Systems, Inc. déclinera spécifiquement toute garantie ou qualité marchande ou aptitude à l’emploi prévu, et ne sera en aucun cas tenu responsable pour tout dommage conséquent, direct, indirect ou accidentel. La responsabilité totale de FLIR est limitée à la réparation ou au remplacement du produit. La garantie définie ci‐dessus est inclusive et aucune autre garantie, écrite ou orale, n’est exprimée ou implicite. Calibrage, réparation et services après‐vente FLIR Systems, Inc. offre des services de calibrage et de réparation pour les produits Extech Instruments que nous commercialisons. Nous fournissons également une certification NIST pour la plupart des produits. Contactez notre service client pour toute information sur les services de calibrage disponibles pour ce produit. Un calibrage doit être effectué chaque année pour vérifier les performances et la précision du mètre. Nous offrons également une assistance technique et un service à la clientèle. Veuillez vous reporter aux coordonnées fournies ci‐dessous. 11
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Garantía FLIR Systems, Inc., garantiza este dispositivo marca Extech Instruments para estar libre de defectos en partes o mano de obra durante un año a partir de la fecha de embarque (se aplica una garantía limitada de seis meses para cables y sensores). Si fuera necesario regresar el instrumento para servicio durante o después del periodo de garantía, llame al Departamento de Servicio a Clientes para obtener autorización. Visite para Información de contacto. Se debe expedir un número de Autorización de Devolución (AD) antes de regresar cualquier producto. El remitente es responsable de los gastos de embarque, flete, seguro y empaque apropiado para prevenir daños en tránsito. Esta garantía no se aplica a defectos resultantes de las acciones del usuario como el mal uso, alambrado equivocado, operación fuera de las especificaciones, mantenimiento o reparación inadecuada o modificación no autorizada. FLIR Systems, Inc., rechaza específicamente cualesquier garantías implícitas o factibilidad de comercialización o idoneidad para cualquier propósito determinado y no será responsable por cualesquier daños directos, indirectos, incidentales o consecuentes. La responsabilidad total de FLIR está limitada a la reparación o reemplazo del producto. La garantía precedente es inclusiva y no hay otra garantía ya sea escrita u oral, expresa o implícita. Servicios de calibración, reparación y atención a clientes FLIR Systems, Inc., ofrece servicios de reparación y calibración para los productos que vendemos de Extech Instruments. Además ofrecemos certificación NIST para la mayoría de los productos. Llame al Departamento de Servicio al Cliente para solicitar información de calibración para este producto. Para verificar el funcionamiento y precisión se debe realizar la calibración anual. Además se provee Soporte Técnico y servicios generales al cliente, consulte la información de contacto en seguida. 12
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Useful Equations and Conversions Area equation for rectangular or square ducts Height (H)
Area (A) = Width (W) x Height (H)
Width (W)
Area equation for circular ducts Area (A) =  x r2
Where = 3.14 and r2 = radius x
radius
Radius
Cubic equations CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
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 1 196.87 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 1 m/s 13
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