Vane Type Airflow Transmitter – Models AT400 and TAT420

Air velocity transmitters for airflow monitoring systems

Request Quote

The AT400 and TAT420 air velocity transmitters supply accurate air velocity and (TAT420) temperature data from a building or process airflow on a continuous basis to a computer, chart recorder, printer and meter or control circuit.

The THT500 humidity-temperature transmitters supply accurate humidity and temperature data from a room or process air source on a continuous basis to a computer, chart recorder, printer, meter or control circuit.

Every instrument has terminals for both DC and AC power and 0-1 V, 0-5V and 4-20mA output.

More Information

Navigate the tab section below to see this product’s Features & Benefits, Specifications, Resources, and more.

  • Specially designed for monitoring indoor air quality
  • Premier series cabling and probe connections
  • Simultaneous measurement of air velocity and temperature
  • The heavy, all metal probe can be used for airstreams that have a wide range of humidity, temperature and contaminants without compromising accuracy
  • HVAC Testing & Balancing
  • IAQ Investigations
  • Industrial Hygiene Ventilation Verification
  • Filter Face Air Velocity Measurement

Main Unit Specifications
Measurement Specifications
Air VelocityMetal rotating vaneAP275/APT275: 2.75″ diameter
AP100/APT100: 1″ diameter
Range1″ Probe: 300 to 6890 FPM (1.5 to 35 m/s)
2.75″ Probe: 50 to 7800 FPM (0.2 to 40 m/s)
Accuracy1″ Probe: ±0.5% of Full-scale + 0.75% of READING ±1 digit
2.75″ Probe: ±1.0% of READING ±1 digit
Resolution1 FPM or 0.01 m/s
TemperatureRangeAPT Probe: -4 to 176 F (-20 to 80C)
Resolution0.1°F or 0.1°C
General Specifications
Analog OutputCurrent output: DC 4~20mA
Voltage output: DC 0~1V or 0~5V
Operating TemperatureTransmitter: -4 to 176F (-20 to 80°C)
Probe: -22 to 212F (-30 to 100°C)
Power Supply120 or 220 VAC (50-60 Hz)
10 to 30 VDC
DimensionsTransmitter HousingW 4.8 x D 2.2 x H 4.8 inches (12.2 x 5.6 x 12.2 cm)
Warranty1 year1 x Rotating Vane Probe Head, Probe cable, Operation Manual, NIST Certificate
TAT4201 x Rotating Vane Probe Head, Probe cable, Operation Manual, NIST Certificate

User Manual


Engineering Drawings


Our sales representatives are here to help you find the right instrument for your application. Fast.

Request a quote today to find the product you need with expert assistance.

Request a Quote Today