Dwyer 641-24-LED Air Velocity Transmitter accurately measures air velocity and temperature. It has a temperature range of -40 to 212°F (-40 to 100°C) and an accuracy of 3% FS. The transmitter requires a power supply of 12-35 VDC, 10-16 VAC, with a 1.5 A rating. It has a fast response time of 1.5 seconds and is designed to meet NEMA 4X (IP66) enclosure rating. The transmitter provides a 4-20 mA output signal and has a 4-1/2 digit red LED display. It is suitable for clean air and non-combustible gases.