When you want to display the measured value (V0H0) converted into the selected flow
rate unit, enter the calculated values for the minimum and maximum flow rate values. See
also the specifications in the Deltatop/Deltaset design sheet. The "Display at 4 mA" (V3H1)
parameter corresponds to the minimum flow rate value and the "Display at 20 mA" (V3H2)
parameter to the maximum flow rate value.
#
Matrix Path through the
menus
Entry
1
Example:
– Lower and upper range-values are set:
"Set 4 mA Value" (V0H1) = 0 mbar
"Set 20 mA Value" (V0H2) = 200 mbar
2
The current measured value displays in the
pressure mode (V0H0) = 128 mbar.
Main group: Linearisation
3
Select operation mode "square root" (flow)
V3H0
➤
Operation
mode
square root
Confirm
4
The minimum flow rate, maximum flow rate
and current measured variable are displayed
as follows:
– "Display at 4 mA" (V3H1) = 0%
– "Dispaly at 20 mA" (V3H2) = 100%
– "Measured value" (V0H0) = 80%
5
Select unit for flow rate
V3H3
➤
Unit after
Linearisation
e.g. m
3
/h
Confirm
6
Enter the converted minimum flow rate value
V3H1
➤
Display at
4 mA
e.g. 0 (m
3
/h)
Confirm
7
Enter the converted maximum flow rate value
(see also Deltatop/Deltaset design sheet)
V3H2
➤
Display at
20 mA
e.g. 3400 (m
3
/h)
Confirm
Results
•
The parameters for the minimum and
maximum flow rate value indicate:
– "Display at 4 mA" (V3H1) = 0 m
3
/h
– "Display at 20 mA" (V3H2) = 3400 m3/h
•
The current measured value (V0H0)
indicates:
– "Measured value" (V0H0) = 2720 m
3
/h
Lower and upper
range-values:
calibration without
reference pressure
Set the required lower and upper range-values via communication. The flow is
determined using the differential pressure and primary elements, e.g. pitot tube or orifice
plate. The lower range-value corresponds to a flow of zero (differential pressure = 0
mbar). The upper range-value corresponds to the differential pressure at maximum flow
(see also the Deltatop/Deltaset design sheet).
#
Matrix Path through the
menus
Entry
Main group: Basic settings
1
Enter known pressure for lower range-value
V0H3
➤
Sets 4 mA
e.g. 0 mbar
Confirm
2
Enter known pressure for upper range-value
V0H4
➤
Sets 20 mA
e.g. 1000 mbar
Confirm
Deltabar S
7 Flow Measurement
Hauser
49
