Dwyer 668D-04-3 is a compact differential pressure transmitter suitable 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 between -40 to 185°F (-40 to 85°C). With an accuracy of ±0.8% FS, this transmitter requires a power supply of 12 to 32 VDC. It provides 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 easily accessible under the small terminal cover. The pressure limit is 15 psig (1.0 bar) and 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, UL 94 V-0 rated. It has a thermal effect of ±0.03% FS/°F (±0.054% FS/°C) and a compensated range from 40 to 170°F (4.4 to 77°C).