Dwyer 668D-04-2 is a compact differential pressure transmitter with an operating temperature range of 0 to 170°F (-18 to 77°C). It has an accuracy of ±0.8% FS and requires a power supply of 12 to 32 VDC. The transmitter has multiple output signal options and zero and span adjustments are easily accessible. It is suitable for 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 enclosure is made of stainless steel and PC+ABS alloy, with a UL 94 V-0 rating. The thermal effect is ±0.03% FS/°F (±0.054% FS/°C) and it is compensated within the range of 40 to 170°F (4.4 to 77°C).