Dwyer 641-24 Air Velocity Transmitter is a reliable and accurate device designed to measure air velocity. It has a wide temperature range of -40 to 212°F (-40 to 100°C) and can operate in ambient temperatures between 32 to 140°F (0 to 60°C). It requires a power supply of 12 to 35 VDC or 10 to 16 VAC. The transmitter provides a 4 to 20 mA output signal with an isolated 24 V source. It has a quick response time of 1.5 seconds and an enclosure rating of NEMA 4X. The device can be mounted in any orientation, but the probe must be aligned with airflow. It is suitable for clean air and compatible non-combustible gases. The 4-1/2 digit 1/2" red LED display provides clear readings. The air velocity transmitter has a pressure limit of 100 psi and a process connection of 1/2" male NPT. It has a loop resistance of 600 Ω max and a maximum current consumption of 300 mA. It features a selectable output filter with a range of 0.5-15 s.