Dwyer 668D-03-1 is a compact differential pressure transmitter that operates in temperatures ranging from 0 to 170°F (-18 to 77°C) and can be stored in temperatures from -40 to 185°F (-40 to 85°C). It has an accuracy of ±0.8% FS and requires a power supply of 12 to 32 VDC. The transmitter has 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). Zero and span adjustments can be accessed under the small terminal cover. It is suitable for use with air and non-conductive gases and has a pressure limit of 15 psig (1.0 bar). The process connection is 3/16" OD barbed brass for 1/8" ID push-on tubing. The transmitter enclosure is made of stainless steel and PC+ABS alloy, with a UL 94 V-0 rating. It has a thermal effect of ±0.03% FS/°F (±0.054% FS/°C) and is compensated for a temperature range of 40 to 170°F (4.4 to 77°C).