WIKA TSD-30 - Manual (Page 20)

20 WIKA operating instructions temperature switch model TSD-30
GB
11613025.02 12/2011 GB/D/F/E
6.4 Switching functions
Hysteresis function
If the temperature fluctuates around the set point, the hysteresis keeps
the switching status of the outputs stable. With increasing temperature,
the output switches when reaching the switch point (SP).
■ Contact normally open (HNO): active
■ Contact normally closed (HNC): inactive
With temperature 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 temperature 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 temperature 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