Wika PSA-31 Manual do Utilizador descarregar pdf (Página 22)

22 WIKA operating instructions pressure switch model PSA-31

14018458.01 11/2011 GB/D/F/E

6.8 Switching functions

Hysteresis function

If the system pressure uctuates around the set point, the hysteresis

keeps the switching status of the outputs stable. With increasing system

pressure, the output switches when reaching the switch point (SP).

■

Contact normally open (HNO): active

■

Contact normally closed (HNC): inactive

With system pressure falling again, the output will not switch back

before the reset point (RP) is reached.

■

Contact normally open (HNO): inactive

■

Contact normally closed (HNC): active

Window function

The window function allows for the control of a dened range.

When the system pressure is between window High (FH) and window

Low (FL), the output switches on.

■

Contact normally open (FNO): active

■

Contact normally closed (FNC): inactive

When the system pressure is outside window High (FH) and window

Low (FL), the output does not switch on.

■

Contact normally open (FNO): inactive

■

Contact normally closed (FNC): active

6. Commissioning, operation

Fig.: Hysteresis function

Fig.: Window function

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