Dwyer 668D-22-1 is a compact differential pressure transmitter designed for air and non-conductive gases. It has an operating temperature range of 0 to 170°F (-18 to 77°C) and can be stored in temperatures ranging from -40 to 185°F (-40 to 85°C). This transmitter has an accuracy of ±0.8% FS and requires a power input of 12 to 32 VDC. It features a terminal strip for electrical connections and offers output signals of 4 to 20 mA (2-wire), 0 to 10 VDC (3-wire), or 0 to 5 VDC (3-wire). The zero and span adjustments are conveniently located under the small terminal cover, and the pressure limit is 15 psig (1.0 bar). The process connection is 3/16" OD barbed brass for 1/8" ID push-on tubing. The enclosure is made of stainless steel and PC+ABS alloy, with a UL 94 V-0 rating. The transmitter has a thermal effect of ±0.03% FS/°F (±0.054% FS/°C) and is compensated for a range of 40 to 170°F (4.4 to 77°C).