Function group: SYSTEM UNITS
Custom
totalizer unit
As well as the engineering units offered for the totalizer, other user-defined units
(selection “user” in function “Volume unit”, see page 34) can also be used.
For this purpose, a conversion factor can be entered in this function giving the
exact ratio of how many of the desired units correspond to the internally used
reference unit “dm
3
”.
1 dm
3
= factor
⋅
[1 user-defined unit]
Example:
1 dm
3
is equivalent to
•
1000 cm
3
→
factor = 1000
•
1/100 hectolitre
→
factor = 0.01
•
0.7 kg with a fluid density of 700 kg/m
3
→
factor = 0.7
Caution!
Prowirl 77 always measures volumetric flowrate at actual operating conditions.
The conversion method described here only applies to constant and exactly
known process conditions.
Any deviation from the assumed process conditions can lead to significant
errors.
Note!
•
The factor can be calculated with the E+H sizing program “Applicator”
(version 7.01.00 and higher). Proceed as described on page 34. The factor
for the user-defined totalizer units is equal to the factor of the corresponding
flow unit .../s.
Example: If the user-defined unit for the totalizer is kg, the factor corresponds
to the factor for kg/s.
•
On the previous pages please find detailed instructions with examples for
the calculation of the factor for mass or corrected volume.
Input:
Value range:
1.0 ·10
-9
...9.999 ·10
9
Note!
Caution!
Prowirl 77 PROFIBUS-PA
6 Device Functions
Hauser
37
