Changing The Full/Span Value; Adding A Level Offset - ABB LWT300 series User Manual

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Figure 39 Calibration parameters
Sensor
reference
Full/Span
Empty/Zero
Probe length

Changing the full/span value

This value (probably set initially from the Easy Setup menu) represents the highest level measurement
value in your vessel.
To set that value:
1 Select Calibrate > Level Calibration > Full/Span.
2 Press Edit.
3 Set the value as necessary and press OK.
By default, the full/span value is linked to the 20 mA value.

Adding a level offset

A level offset is a distance that you might add and that represents the distance between the bottom of
the tank and the empty/zero value.
The default value for this parameter is 0 m. The value can be set between –50 and 50 m.
To set that value:
1 Select Calibrate > Level Calibration > Level Offset.
2 Press Edit.
3 Set the value as necessary and press OK.
60
User Guide
Ullage
Level
+ sensor offset
20 mA (URV)
100%
Distance
4 mA (LRV)
0%
Level offset