Electro-hydraulic pressure switches are devices, which, when set under pressure close or open electrical contacts. They are widely used in applications where it is intended that, once a pre-set pressure is achieved and exceeded, an electrical switching command or signal should be triggered for further working cycles.
Many different versions (with pressure setting on a dial, with main and secondary switch, screw-on pressure switches) enable their use in many applications.
There is a design related difference of 8 ... 20 % between the upper switching point and the lower switching point. Only the electronic pressure switch type DG 5 E gives provision to select two independant switch points and to set the hysteresis.
Type DT is an analogous pressure sensor.
Overview of the product type
Pressure switches type DGOperating instruction for HAWE equipment intended for use in explosive atmospheres pursuant
