Dwyer 685-08 is a compact and accurate differential pressure transmitter suitable for air and non-corrosive gases. With a temperature range of -4 to 158°F (-20 to 70°C) and an accuracy of ≤ ±0.5% RSS (BFSL), ± 1Pa, it is reliable in various environments. The transmitter has a quick response time of 1 s (default) or 200 ms (user selectable) and an IP54 enclosure rating. It features a piezoresistive pressure sensor and can handle a humidity range of 0 to 95% RH. The electrical connections are made easy with a spring connector for cable and leads up to 1.5 mm². The output signal can be 2-wire: 4-20 mA or 3-wire: 0-10 V, and it operates on a voltage range of 2-wire: 18-30 VDC or 3-wire: 18-30 VAC/DC. The transmitter is mounted securely with screw fastening using sheet metal screws. The material used is ABS, ensuring durability. It has a loop resistance of 2-wire: 500 Ω max or 3-wire: ≥ 1 kΩ (≤ 10 mA). The connection is a 6 mm hose connection and the dimensions are Ø 66 x 28 mm. The stability is ≤ ±1% RSS per year and it has a cap nut conduit, 15 mm (across flats), made of polyamide for easy cable conduit installation. The maximum current draw is 2-wire: 21 mA or 3-wire: 40 mA.