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Application examples
C.3 Example 2: Horizontal vessel with volume measurement
SITRANS Probe LR with mA/HART
96
Operating Instructions, 05/2019, A5E32337711-AC
C.3
Example 2: Horizontal vessel with volume measurement
Note
•
The minimum distance from the flange face to the target is limited by Near Blanking
P800.
•
Only set P837 if the product is at least 2 m (78”) away from the flange face. If it is closer,
leave P837 at 1 until the level drops and the distance increases beyond 2 m (78”).
The application is to obtain a level measurement and corresponding 4 to 20 mA output
proportional to vessel volume in a chemical vessel. Process empty level (Empty) is the
bottom of the tank, which is 3.5 m from the antenna flange face. Process full level (Span) is
3.0 m from the vessel bottom. The maximum rate of filling or emptying is about 0.2 m/min.
Selecting tank shape 7 at P050, and entering values for A and L, will give a volume reading
instead of level. In the event of a loss of echo, SITRANS Probe LR is to go into Failsafe Hi
after 2 minutes.
①
Empty
②
Reference point
③
Volume reading
Parameter
Description
Value
Function
P001
Mode of measurement
1
Volume replaces Level when a tank shape
is selected at P050
P003
Measurement response 2
1 m/minute
P005
Units
1
meters
P006
Empty distance
3.5
3.5 m
P007
Span
3
3 m
P050
Vessel shape
7
parabolic ends
P051
Maximum volume
8000
8000 liters
P052
Vessel dimension A
0.8
0.8 meters
P053
Vessel dimension L
6
6 meters
P070
Failsafe timer
2
2 minutes
P071
Failsafe
1
Hi