Adjustment; Switching Functions; Hysteresis Function - WIKA FSD-3 Mode D'emploi

5. Commissioning, operation

5.6 Adjustment

1. Depressurise the system and switch off the flow.
2 Mount the flow switch and connect it electrically.
.
(→ refer to chapter 5.1 "Mechanical mounting" and 5.2 "Electrical mounting")
3. Recall menu item "SETF" ▶ "MIN" and confirm "0".
EN
4. Set the maximum flow in the system.
Observe measuring ranges (→ see chapter 9 "Specifications").
5. Recall menu item "SETF" ▶ "MAX" and confirm "100".

5.7 Switching functions

Hysteresis function

If the flow rate fluctuates around the set point, the hysteresis keeps the
switching status of the outputs stable. With increasing flow rate, the output
switches when reaching the switch point (SP).
Contact normally open (HNO): Active
■
Contact normally closed (HNC): Inactive
■
With the flow rate 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
■
20 WIKA operating instructions flow switch, model FSD-3
Fig.: Hysteresis function