Switching Functions - WIKA LSD-30 Mode D'emploi

6. Commissioning, operation

6.4 Switching functions

Hysteresis function
GB
If the level fluctuates around the set point, the hysteresis keeps
the switching status of the outputs stable. With increasing level,
the output switches when reaching the switch point (SP).
Contact normally open (HNO): active
■
Contact normally closed (HNC): inactive
■
With the level 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 defined range.
When the level 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 level 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
■
22 WIKA operating instructions level switch model LSD-30
Fig.: Hysteresis function
Fig.: Window function