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Hysteresis function
The hysteresis keeps the switch status of the output
stable if the flow is fluctuating around the nominal
value.
With increasing flow, the output switches upon reach-
ing the switch point (SPx).
If the flow decreases again, the output only switches
back when the return switch point (rPx) is reached.
The hysteresis is adjustable:
First the switch point is determined, then the return
switch point at the desired distance.
Window function
The window function allows a defined OK range to be
monitored.
If the flow is fluctuating between switch point (SPx)
and return switch point (rPx), the output is switched
through (window function/NO contact) or opened
(window function/NC contact).
The size of the window is adjustable by the distance
between SPx and rPx.
SPx = upper value; rPx = lower value.
Display unit
3 settings can be selected:
•
Lmin = Flow in Nl/min or Nm³/min
•
nm3h = Flow in Nm³/h or Nm³/h x 1000
•
nm3 = Quantity counter in standard cubic metres
Set the display unit before you set the values for the
SPx, rPx, ASP and AEP parameters. That way you
avoid rounding up/down errors in the internal conver-
sion into other units and are provided with exactly the
values required.
6 Operation
Hysteresis
OK range
35
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