Function group: SYSTEM UNITS
The following instructions explain in more detail pages 34 and 37.
Instructions for user-defined mass units:
“Custom flow unit”
or
“Custom total unit”
Examples:
To display the
mass flow
of superheated steam at 200 °C and 12 bar in “kg/h”.
According to the steam table the density is 5.91 kg/m
3
:
“Custom flow unit” =
To display the
totalized mass
in “kg” for the same superheated steam application (density 5.91 kg/m
3
):
“Custom total unit” =
5.91
1000
3600
1
1
= 21.276
••
5.91
1000
1
1
= 0.00591
•
1000
1
Density at operating
conditions in kg/m
3
for desired time base
(not for totalizer)
.../s → 1
.../min.→ 60
.../h → 3600
.../d → 86400
for desired mass
unit
kg/... → 1
t/... → 1000
lbs/... → 0.4536
ba032y01
Prowirl 77 PROFIBUS-PA 6 Device Functions
Endress+Hauser 35
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