Air Velocity and Temperature Transmitter For Air And Non-combustible Gases With Optional Relay Output. AVT series air velocity transmitters are engineered for building automation in the HVAC/R industry. The AVT measures air velocity and temperature, with field selectable range and output options in a single device. Designed with a duct mount probe and adjustable collar suitable for round or rectangular ducts. AVT series devices include: 3 field selectable measurement ranges for air velocity, selectable via jumper (see Product information). Separate readings and outputs for air velocity and temperature. Proportional output options include: voltage (0–10 V) and current (4–20 mA). AVT series device options offer: Backlit display Field adjustable relay We are HVAC supplier in Malaysia. For more information, please visit our website. You can contact Ms.Toh for any questions via the phone number 012-295 1393 or email to [email protected]