WIKA LSD-30 - Manual (Page 22)

22 WIKA operating instructions level switch model LSD-30
GB
11613033.01 01/2012 GB/D/F/E
6.4 Switching functions
Hysteresis function
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
6. Commissioning, operation
Fig.: Hysteresis function
Fig.: Window function