USER MANUAL CFM/CMM Thermo Anemometer Model AN100
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.
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.
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 oC CFM/CMM: airflow units of measure Ft2, m2: units for area dimen
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 Flow Measurements (CMM / CFM) 1. Turn on the meter using the 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. ON/OFF button 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.
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.
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.
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.
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) = π x r2 Where π= 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.
