The NOSHOK series 621 pressure transmitters combine the reliability and long life of diffused semiconductor and sputtered thin film strain gage sensors with safe electronics for outstanding performance and value. These transmitters were designed for applications that require pressure measurement in hazardous environments. All wetted parts are made of stainless steel and elgiloy welded with no internal O-rings, gaskets or seals. Units undergo extensive testing during the manufacturing process to ensure that the highest performance is achieved in the demanding environments found in today's applications. The transmitters are available with a standard threaded connection as well as a flush diaphragm configuration and are factory mutual approved. Models incorporate significant levels of RFI, EMI and ESD protection. Ideal for hydraulic and pneumatic systems, pumps and compressors, test equipment and systems, HVAC systems, power generation, water and wastewater, refrigeration equipment, laboratory and test equipment, chemical/petrochemical, marine, pipeline gas compressors, oil field and offshore applications. Accuracy: +/-0.25 percent full scale (BFSL). Hysteresis: less-than equal to +/-0.1 percent full scale. Repeatability: less-than equal to +/-0.05 percent full scale. Stability: less-than equal to +/-0.2 percent full scale for 1 year, non accumulating. Load limitations: less-than equal to (VPower-10)/0.020 Amp for 4 mA to 20 mA. Zero/Span offset: less-than equal to +/-0.5 percent full scale. Response time: less than 1 ms (between 10 percent and 90 percent full scale). Durability: greater-than 100,000,000 full scale cycles. Housing material: 316 stainless steel. Environmental rating: NEMA 4x (IP67). Electrical rating: Reverse polarity, over-voltage and short circuit protected. Shock: 1000 g's according to IEC 770 for mechanical shock. Output Signal: 4 mA to 20 mA 2-wire. Power Supply: 10 Vdc to 30 Vdc unregulated. Load limitations: