User's Manual

7ML19985JE03 SITRANS LR250 (HART) – INSTRUCTION MANUAL Page 143
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E: Application Examples
Horizontal vessel with volume measurement
To obtain level measurement/4 to 20 mA output proportional to vessel volume in a chemical
vessel:
Low Calibration Point = 3.5 m (11.48 ft) from sensor reference point
High Calibration Point = 0.5 m (1.64 ft) from sensor reference point
Max. fill/empty rate = 0.2 m/min (0.65 ft/min)
Select vessel shape, Parabolic Ends, and enter values for A and L, to obtain a volume reading
instead of level.
In the event of a loss of echo: SITRANS LR250 is to go into Fail-safe High after 2 minutes.
Return to Measurement: press Mode to start normal operation.
Note: The minimum distance from the flange face to the target is limited by Near Range
(2.8.1.).
Parameter
type
Parameter No./Name
Options/
Values
Function
Quick
Start
Wizard
parame-
ters
Material (1.2.) LIQUID
Response Rate (1.3.) MED Medium =1 m/minute
Units (1.4.) M meters
Operation Mode (1.5.) LEVEL
Level is reported as Volume
when a vessel shape is selected.
Low Calibration Point (1.6.) 3.5 3.5 m (11.48 ft)
High Calibration Point (1.7.) 0.5 0.5 m (1.64 ft)
Apply? (Apply changes) (1.8.) YES
Transfers Quick Start settings to
device.
Indepen-
dent
parame-
ters
Vesse l S hape (2.7.1.1.) PAR ABOL IC EN DS Defines vessel shape.
Maximum Volume (2.7.1.2.) 8000 8000 liters
Dimension A (2.7.1.3.) 0.8 0.8 m (2.62 ft)
Dimension L (2.7.1.4.) 6 6 m (19.68 ft)
Timer (2.5.2.) 2 2 minutes
Material Level (2.5.1.) HI Fail-safe level set to High
volume
reading
3.5 m
A
= 0.8 m
L
= 6 m
Low Cal
Point
100% = 8000 l
sensor
reference
point
A
= 0.8 m
High
Cal
Point
0.5 m