Diaphragm pressure switch 700 series

differentialNPT 1/4NPT 1/2

The Series 700 Pressure and Differential Pressure switches offer accurate, reliable switching in a robust cast enclosure. • Exd, ExnC, ExtD, Exia, I.S. • HIGH OVERLOAD RATINGS • SIMPLE MAINTENANCE • SAFETY VENT RING These switches provide excellent repeatability and long in-service life, under both continuous cycling and overload conditions, due to the mechanical restriction of diaphragm travel. A standard feature of the design is the inclusion of a venting and isolation chamber which (in the unlikely event of the process diaphragm failure) will prevent the process entering the switching enclosure. The setpoint of the switch is adjusted by means of a capstan head screw, located within the lower section of the enclosure. This enables adjustment to be made even when energised, as it does not violate the flameproof integrity of the enclosure. With over 50 pressure and DP ranges and a wide selection of output switches, diaphragm and pressurechamber materials, and process connections (including flanges), Series 700 switches meet the requirements of a wide range of applications. In addition HNL can offer many non-standard options (see back page for details) or customise this product to meet your unique requirements.