Commissioning
Proline Promag 55 FOUNDATION Fieldbus
72
Hauser
Formula for calculation (example)
The mass flow of the target fluid is calculated as follows:
Configuration of solids content flow function
Please note the following points when commissioning the solids content flow function:
1.
Please ensure that the settings in the following functions are identical in both the flow
measuring device and the external density measuring device:
– ASSIGN ANALOG OUTPUT (AO)
2.
Then enter the following density values:
SPECIAL FUNCTIONS > SOLID CONTENT FLOW > CONFIGURATION >
CARRIER DENSITY (7711) and TARGET MAT. DENSITY (7712)
3.
Enter the desired density unit:
MEASURED VARIABLES > SYSTEM UNITS > ADDITIONAL CONFIGURATION >
UNIT DENSITY (0420)
4.
If necessary, assign the relevant measured variables for solids content flow to a display line or
an output (current, frequency, relay). For process control, you may also assign freely definable
limit values to the solids content flow (
→
see the following examples).
Case study 1:
You would like to configure the totalizer for totaling the overall mass flow rate of solids (e.g. in tons).
1.
Open the ASSIGN function for the totalizer (> TOTALIZER > CONFIGURATION > ASSIGN).
2.
Assign the TARGET MASS FLOW variable to the totalizer.
Case study 2:
You would like to issue a warning via the relay, in case the solids content flow exceeds 60% of the
total mass flow (transport fluid + solids).
1.
Open the ASSIGN function for the relay output(> OUTPUTS> RELAY OUTPUT >
CONFIGURATION > ASSIGN).
2.
In addition, assign the LIMIT VALUE % TARGET MASS FLOW measured variable to the relay
output.
3.
Using the ON-VAL.LF-CUTOFF or OFF-VAL.LF-CUTOFF function, you can then enter the
desired percentage value (%) for the maximum permitted solid content flow (e.g. switch on at
65% solids content; switch off at 55% solids content).
m
Z
= V
⋅ (ρ
M
−
ρ
C
) / (
1
−
ρ
C
/ρ
S
)
m
Z
V
ρ
C
ρ
S
ρ
M
=
=
=
=
=
Mass flow target fluid (solids), e.g. in kg/h
Volume flow (total fluid), e.g. in m
3
/h
Density of carrier fluid (transport fluid: e.g. water)
Density of target fluid (transported solids: e.g. stone, sand, lime powder etc.)
Total density of fluid
