Window Function - WIKA FSD-4 Manual De Instrucciones

5. Commissioning, operation

Window function

The window function allows for the control of a defined range.
When the flow is between window high (FH) and window low (FL), the output
switches on.
Normally open contact (FNO): Active
■
Normally closed contact (FNC): Inactive
■
When the flow is outside window high (FH) and window low (FL), the output does
not switch on.
Normally open contact (FNO): Inactive
■
Normally closed contact (FNC): Active
■
Delay times (0 ... 65 s)
This makes it possible to filter out unwanted flow peaks of a short duration or a
high frequency (dampening).
The flow value must be present for at least a certain pre-set time for the output to
switch on. The output does not immediately change its status when it reaches the
switching event (SP), but rather only after the pre-set delay time (DS).
If the switching event is no longer present after the delay time, the switch output
does not change.
The output only switches back when the flow has decreased to the reset point (PR)
and stays at or below the reset point (RP) for at least the pre-set delay time (DR).
If the switching event is no longer present after the delay time, the switch output
does not change.
WIKA operating instructions flow switch, model FSD-4
Fig.: Window function
Fig.: Delay times
EN
21