User's Guide Cup Thermo-Anemometer Model AN400
Introduction Congratulations on your purchase of the Extech Cup Thermo-Anemometer. The AN400 measures air velocity in five units of measure: feet per minute (ft/min), meters per second (m/sec), miles per hour (MPH), kilometers per hour (km/hr), & nautical miles per hour (knots). The low-friction cup vane freely rotates in response to air flow. An internal thermistor allows the AN400 to measure air temperature in Centigrade or Fahrenheit units.
Operation Connecting the Vane Cup 1. Place the cup vane on the top of the meter housing. 2. Rotate the top screw in a counter-clockwise until the screw is secured. direction Meter Power 1. Press the POWER button to turn the meter on. If the display does not switch on, check that four AAA batteries are installed. To access the battery compartment, remove the battery cover by rotating it in a counter-clockwise direction. 2. Press the POWER button to turn the meter off. 3.
Record and Recall MIN / MAX Function 1. To begin capturing the Minimum (MIN) and Maximum (MAX) air velocity and temperature readings, momentarily press the REC key. The “REC” icon will be displayed. 2. Now, use the REC button to toggle the view from MIN to MAX and from MAX to MIN readings. The ‘RECMAX’ or ‘REC MIN’ will appear along with the recalled reading for convenience. 3.
Maintenance Battery Replacement The AN400 is powered by four 1.5V AAA batteries. When the low battery icon appears on the LCD or if the display does not switch on when the POWER button is pressed, replace or install the batteries. 1. Twist off the battery compartment cap by rotating it counter-clockwise. 2. Replace the four AAA batteries observing polarity. 3. Replace the battery compartment cap. x Cleaning and Storage Wipe the meter and vane with a damp cloth as needed.
Specifications Circuit description Custom LSI microprocessor design Display Dual function 9999 count LCD display Measurement units m/s, km/h, ft/min, knots, mph, Temperature C/ F Data hold Freezes reading on the display Sensor Structure Air velocity sensor: Cup vane arm with low-friction ballbearing design.