RMA42
Commissioning
Hauser
21
Differential pressure application
A concise setup is available for differential pressure applications.
Once the differential pressure application setup has been successfully completed, the configured
parameters of the analog inputs and the linearization points are used to automatically form the
difference between the two inputs and linearize the signal. As a result, the volume is already shown
on the display (= calculated value 2).
"
Caution!
The following is essential to ensure values are calculated correctly and that the setup functions
properly:
• Sensor 1 returning the higher pressure: connected to analog input 1 (‘
Analog in 1
’)
• Sensor 2 returning the lower pressure: connected to analog input 2 (‘
Analog in 2
’)
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Fig. 8:
Differential pressure application
Setup
É
Application
É
Diff pressure
After selecting the differential pressure application by confirming the "Diff pressure" parameter, the
parameters, which are displayed in succession and can be edited, must be configured individually
for your application.
Some parameters are already configured for you by selecting the application setup (
22).
The parameter “CV Factor” serves for the regard of the density of the medium at level
measurement, i.e. it equates the mathematic formula 1/(density*gravitational acceleration). The
standard value of the factor is 1.
At this the density is to be named in kg/m
3
and the pressure in Pascal (Pa) or N/m
2
. The
gravitational acceleration is defined by the constant on the earth’s surface.
It amounts g=9.81m/s
2
.
Tables and examples for the conversion of application related units into the defined values kg/m
3
and Pa respectively N/m
2
can be found in the appendix,
49.
!
Note!
If you want to activate other parameters (see Step 4, 5, 6 and 7 or offset for analog inputs, display
original values of analog channels, etc.), you can do so afterwards in the setup of the corresponding
parameter.
