Endress+Hauser prowirl 77, Руководство по эксплуатации

Страница: 35 / 64

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
ba032
y
0
1
Prowirl 77 PROFIBUS-PA 6 Device Functions
Hauser 35