Dwyer 641-30 Air Velocity Transmitter is a robust device designed for measuring air velocity in clean air and compatible, non-combustible gases. It has a temperature range of -40 to 212°F (-40 to 100°C) and an accuracy of 3% full scale. The transmitter requires a power supply of 12 to 35 VDC or 10 to 16 VAC and draws an initial power surge of 1.5 A. It has a fast response time of 1.5 seconds to reach 95% of the final value. The enclosure is designed to meet NEMA 4X (IP66) standards. The transmitter provides a 4-20 mA output signal and has a 4-1/2 digit 1/2" red LED display for easy reading. It can be mounted in any orientation, but the probe must be aligned with the airflow. The device has a pressure limit of 100 psi (6.89 bar) and a process connection of 1/2" male NPT. With a loop resistance of 600 Ω max and a current consumption of 300 mA max, the transmitter offers reliable performance.