Flow measurement
Cerabar S/Deltabar S/Deltapilot S 4...20mA HART
42
Hauser
You can use the LINEAR/SQROOT parameter (
Page 113) to specify whether the current
output should depict the linear pressure signal or the Flow (square root) flow signal. Depending
on the setting of the LINEAR/SQROOT parameter, enter the following values for SET LRV and
SET URV:
– LINEAR/SQROOT = Flow (square root) (factory setting)
flow value
– LINEAR/SQROOT = Differential pres.
pressure value
The following applies for the setting LINEAR/SQROOT "Flow (square root)":
As per the factory settings, the lower current value is set to equal zero and the upper current
value is set to the MAX. FLOW value. If you enter a value for MAX. FLOW, the SET URV
parameter is also changed. If you want to assign values other than zero and MAX. FLOW to
the lower and upper current values, the desired values must be entered for SET LRV and SET
URV.
The following applies for the setting LINEAR/SQROOT "Differential pres.":
As per the factory settings, the lower current value is set to equal zero and the upper current
value is set to the MAX. PRESS. FLOW value. If you enter a value for MAX PRESS. FLOW, the
SET URV parameter is also changed. If you want to assign values other than zero and MAX
PRESS. FLOW to the lower and upper current values, the desired values must be entered for
SET LRV and SET URV.
5.
In the lower measuring range, small flow quantities (creepages) can lead to large measured
value fluctuations. You can activate low flow cut-off via the LOW FLOW CUT-OFF parameter
(
Page 99).