Dwyer 641B-4 Air Velocity Transmitter is a reliable and accurate device with a temperature range of -40 to 176°F. It operates on a power requirement of 12 to 35 VDC or 10 to 16 VAC. With a quick response time of 1.5 seconds, it has an enclosure rating of NEMA 4X and can be used in non-condensing humidity conditions. The electrical connections are screw terminals and it provides a 4-20 mA output signal. Suitable for air and compatible gases, it can be mounted in any orientation and has a loop resistance of 600 Ω max. Current consumption is 300 mA max and it has a selectable output filter.