WIKA PSD-30 Mode D'emploi page 16

GB
7. Starting, operation
Switch function
Hysteresis function
If the system pressure fluctuates around the nominal value,
the hysteresis keeps the switch status of the outputs stable.
When the system pressure is rising, the output switches when it
reaches the respective set point (SP); if the pressure falls again,
the output switches back only if the reset point (RP) is reached.
Application example: loading an accumulator.
The shut-off valve loads up to 8o bar and then shuts off. When
70 bar is reached again, it switches on once more.
Window function
The window function allows the monitoring of a defined range.
If the system pressure is between the window high (FH) and the
window low (FL), the output is activated (NO) respective
deactivated (NC).
Delay times (0.00 to 50 s):
By this means unwanted pressure peaks of short duration or high
frequency can be filtered out.
The pressure must remain for at least this time to enable the
switch to operate. The switching output does not immediately
change its status when it reaches the switching event, but only
after the delay time has elapsed. If the switching event no longer
pertains when the delay time has elapsed, the switching output
does not change.
16 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio PSD-30