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   Category: our product range >> Air Velocity >> Hot Wire Anemometer Accessory Head - Code : AAT3
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: -4F to 140F (-20C to 60C)
Temperature: -4F to 140F (-20C to 60C)
Relative humidity: 32F to 131F (0 to 55C)
Storage temp: -4F to 140F (-20C to 60C) <80% R.H. (Batteries removed)
Output impedance:  approx. 1KΩ
Temperature coefficient:  0.1 x (specified accuracy) per C (28C) (82F)

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

Range: -4F to 140F     (-20C to 60C)
Accuracy:    1F    32F to 113F
        2F    -4F to 32F, 113F to 140F
        0.5C    0C to 45C
        1C    -20C to 0C, 45C to 60C
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