Hot Wire Anemometer

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Hot Wire Anemometer Accessory Head - Code : AAT3

The AAT3 is a Hot-Wire Anemometer & Psychrometer in one accessory head.  Now HVACR professionals can measure air velocity, temperatures, and %RH all in one tool. When attached to a wireless transmitter, AAT3 measurements can be sent wirelessly to any Fieldpiece wireless meter (HG3, LT17AW, EH4W) from anywhere on the job site. So results can be read in real-time on your wireless meter from up to 30 mtrs away.



  • Telescopic 1-mtr probe for In Duct or Grille access
  • Measures temperatures, %RH, and air velocity
  • Calculates wet bulb and dew point
  • Automatically calculates Target Superheat, Target Evap Exit Temperature, and Total CFM (when using the Fieldpiece HVAC Guide System Analyzers)
  • Fast response time
  • Depth and direction indicators
  • Hands-free testing with stabilizing cone and magnetic hanger
  • Can send wireless measurements from up to 30metres away


Operating environment:
Air Velocity: -4°F to 140°F (-20°C to 60°C)
Temperature: -4°F to 140°F (-20°C to 60°C)
Relative humidity: 32°F to 131°F (0 to 55°C)
Storage temp: -4°F to 140°F (-20°C to 60°C) <80% R.H. (Batteries removed)
Output impedance:  approx. 1KΩ
Temperature coefficient:  0.1 x (specified accuracy) per °C (28°C) (82°F)

Range: 40-3940 ft/min (0.20-20.00 m/s)
note: to use full range AAT3 must be connected to a DMM with a 4000 mVDC range or greater.
Accuracy: ± (5%+1 dgt) reading or ± (1%+1dgt)full scale.

Range: 0% to 100% RH
    ±2.5% @ 73.4°F (23°C), 10% to 90% RH
    ±5% @ 73.4°F (23°C), 90% RH
Sensor Response Time: 60 seconds typical for 90%
of total range.
Sensor Hysteresis: ±1%RH typical

Range: -4°F to 140°F     (-20°C to 60°C)
Accuracy:    ±1°F    32°F to 113°F
        ±2°F    -4°F to 32°F, 113°F to 140°F
        ±0.5°C    0°C to 45°C
        ±1°C    -20°C to 0°C, 45°C to 60°C
Sensor type:
    Air velocity: Tiny glass bead thermistor.
    Relative Humidity: Capacitance polymer film.
    Temperature: Precision thermistor.
Battery:  9V
Battery life: 20 -35 hours typical
Battery indication: Red Lo Batt LED
Auto Power off: after 15 minutes of inactivity if APO is active

Download Specification and Operating Data