Installation & Use Of Pressure Switches

1. Before fitting the pressure switch to a pressure source ensure that the maximum pressure of the pressure switch  is higher than that of the pressure to be applied.                                                                                                                                               


2. Before fitting the pressure switch to a pressure source check that the wetted parts are compatible with the fluid being used, and that the pressure connection correctly matches that of the pipework.                                                                         


3. Do not use piston type pressure switches on gases.                                                             


4. Do not use standard pressure switches on Oxygen or Acetylene unless approved by ourselves.                                                                                                               


5. For hazardous areas Flameproof Pressure Switches  series 500 have the necessary approvals.                                                                                                                 


6. When fitting the pressure switch to the pipework use correct sealing methods.  Do not use the switch housing to tighten the switch to the pipework use correct spanners on the base hexagon.                                                                                       


7. Differential pressure switches should not be used with more than the range applied to one side.  Line pressure must not exceed the line pressure stated on the pressure switch label.  The higher of the two pressures must be connected to the port marked high and the lower of the two pressures must be connected to the port marked low.                                                                                               


8. Ensure that the electrical supply is isolated before removing the cover.  All covers are marked with a warning flash.                                                                           


9. Ensure before connecting the terminals of the pressure switch to the circuit that the electrical switch is of the correct rating.  The rating is stated on the pressure switch label.                                                                                                           


10. Ensure that the terminals are connected correctly and the pressure switch body is correctly earthed.  The microswitches we use are the single pole double throw (SPDT) variety.                                                                                                           


11. Ensure that the pressure switch set point is correct before use.                                         


12. Ambient and process temperature acting on the pressure switch should be within -50^OF to +180^OF and protected from higher fluid temperatures by means of a syphon tube filled with condensate before use.  The fluid in the pressure chamber should not be allowed to freeze or crystallise as this will