Adding A Sensor Offset; Setting Upper/Lower (4 - 20 Ma) Reference Values - ABB LWT300 series User Manual

Adding a sensor offset

A sensor offset is a small distance that you might need to add to the sensor reference value (e.g., if the
probe in bent slightly at the junction with the sensor).
The default value for this parameter is 0 m. The value can be set between –30 to 30 m.
To set that value:
1 Select Calibrate > Level Calibration > Sensor Offset.
2 Press Edit.
3 Set the value as necessary and press OK.
Setting upper/lower (4 – 20 mA) reference values
The upper and lower current reference values are automatically linked to the empty/zero and full/span
values when configuring the LWT instrument for the first time with the Easy Setup menu.
You cannot change these current reference values while they are linked (the instrument will not let you
do it). For more information on unlinking the reference values, see "Unlinking the primary value from the
empty/full values" on page 43.
The default value for these parameters is 0 m. The value can be set between 0 and 75 m.
To set these values (once unlinked):
1 Select Calibrate > Level Calibration > 4 mA (LRV) or 20 mA (URV).
LRV is the lower reference value and URV is the upper reference value.
The LRV default value is 0 m. This value can be edited between 0 and 75 m.
The URV default value is the probe length. This value can be edited between 0 and 75 m.
2 Press Edit.
3 Set the new reference value and press OK.
Setting calibration parameters
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