User's Manual CFM/CMM Thermo Anemometer Model AN100 CFM/CMM Thermo-Anemometer 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. Meter Description 1. LCD Display 2. Vane 3. Rubber Boot 4. Meter 5. Power On/Off 6. Area 7. AVG 8.
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 o C / F: Temperature units of measure • CFM/CMM: airflow unit
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 2 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.
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 button MAX/MIN button.
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.
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) Range Resolution Area 1 0 to 9.
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) = 6 x r2 Where 6 = 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.
