WIKA FSD-3 - Page 21

21WIKA operating instructions flow switch, model FSD-3
EN
14153887.01 09/2016 EN/DE/FR
Window function
The window function allows for the control of a dened range.
When the ow rate 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 ow rate 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
Delay times (0 ... 50 s)
This makes it possible to lter out unwanted ow peaks of a short duration or
high frequency (damping).
The ow rate 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 switching
output does not change.
The output only switches back when the ow rate has fallen down to the reset
point (RP) 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 switching
output does not change.
Fig.: Window function
5. Commissioning, operation
Fig.: Delay times