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Handheld anemometer with rotating vane probe and carrying case

Uei Test Instruments

Uei Test Instruments DAFM3B Anemometer Humidity 99 to 3937 FPM

SKU CH-SY5B-3THNG

Measures air velocity from 99 to 3937 fpm and humidity from 0.1 percent with +/-3 percent accuracy, includes carrying case

  • TypeEnvironmental & Mechanical
  • Measures air velocity from 99 to 3,937 fpm for HVAC balancing
  • Rotating vane probe captures airflow across 3 in diameter
  • Simultaneous humidity readings with ±3 % accuracy
  • Temperature measurement within ±1.5 °F for environmental checks
  • Includes carrying case for protected field transport

UEI DAFM3B Anemometer with Humidity

The UEI DAFM3B anemometer measures air velocity from 99 to 3937 fpm and relative humidity from 0.1 percent with a rotating vane probe. It also records dew point down to -90 degrees F and ambient temperature with a stated accuracy of +/-1.5 degrees. The unit ships with a carrying case for field use.

Installation and common issues

Power the meter on and allow the sensors to stabilise at the minimum operating temperature of 32 degrees F before taking readings. The rotating vane must spin freely; debris or a bent vane will cause low or erratic velocity figures. Humidity accuracy is rated at +/-3 percent, so avoid condensation on the sensor element.

Practical limits of the rotating vane

The rotating vane probe diameter of 3 inches limits measurements in ducts smaller than the probe face. Air velocity resolution of 0.1 fpm is suitable for low-speed balancing but not for turbulence research. The specified range tops out at 3937 fpm, so higher-velocity systems require a different instrument.

Highlights

  • Measures air velocity from 99 to 3,937 fpm for HVAC balancing
  • Rotating vane probe captures airflow across 3 in diameter
  • Simultaneous humidity readings with ±3 % accuracy
  • Temperature measurement within ±1.5 °F for environmental checks
  • Includes carrying case for protected field transport

Specifications

BrandUEI TEST INSTRUMENTS
TypeEnvironmental & Mechanical

Questions about this item

How can I verify the anemometer is reading airflow correctly after turning it on?

Point the 3-inch rotating vane probe into a known airflow and confirm the display shows a value between 99 and 3937 fpm with 0.1 fpm resolution.

What accessories are included and what must I purchase separately to start measuring?

The unit ships with a carrying case; no additional probes or cables are required for air velocity, temperature or humidity readings.

Which measurement range should I rely on for low-speed duct work versus high-velocity exhaust testing?

The instrument covers 99 to 3937 fpm in a single range, so the same device handles both low-speed duct work and high-velocity exhaust testing.

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