Commissioning Deltabar M 4...20 mA HART
26 Endress+Hauser
5.5 Commissioning of Flow measurement
5.5.1 Information on flow measurement
In the "Flow" measuring mode, the device determines a volume or mass flow value from the
differential pressure measured. The differential pressure is generated by means of primary
elements such as pitot tubes or orifice plates and depends on the volume or mass flow. Four flow
types are available: volume flow, norm volume flow (European norm conditions), standard
volume flow (American standard conditions), mass flow and flow in %.
In addition, the Deltabar M software is equipped with two totalizers as standard. The totalizers
add up the volume or the mass flow. The counting function and the unit can be set separately
for both totalizers. The first totalizer (totalizer 1) can be reset to zero at any time while the
second (totalizer 2) totalises the flow from commissioning onwards and cannot be reset.
!
Note!
The totalizers are not available for the "Flow in %" flow type.
Parameter name Description
Lin./SQRT switch (133)
Display
Displays the status of DIP switch 4 on the electronic insert, which is used to define
the output characteristics of the current output.
Measuring mode (005)
Selection
Select the "Flow" measuring mode.
Pressure side switch (163)
Display
Indicates whether the "SW/P2High" DIP switch (DIP switch 5) is switched on.
High pressure side (006)
(183)
Selection
Determines, which pressure input corresponds to the high-pressure side.
!
Note!
This setting is only valid if the "SW/P2High" DIP switch is in the OFF position (see
the "Pressure side switch" (163) parameter). Otherwise P2 corresponds to the
high- pressure side in any case.
Press. eng. unit (125)
Selection
Select the pressure unit.
If a new pressure unit is selected, all pressure-specific parameters are converted and
displayed with the new unit.
Corrected press. (172)
Display
Displays the measured pressure after sensor trim and position adjustment.
Pos. zero adjust (007)
Selection
Position adjustment – the pressure difference between zero (set point) and the
measured pressure need not be known.
Example:
– Measured value = 2.2 mbar (0.033 psi)
– You correct the measured value via the "Pos. zero adjust" parameter with the
"Confirm" option. This means that you assign the value 0.0 to the pressure
present.
– Measured value (after pos. zero adjust) = 0.0 mbar
– The current value is also corrected.
Max. flow (009)
Entry
Enter maximum flow of primary element.
See also layout sheet of primary element. The maximum flow is assigned to the
maximum pressure which you enter via the "Max. pressure flow" (010) parameter.
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