Setting Calibration Parameters - ABB LWT300 Series User Manual

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C h a p t E R 7

Setting calibration parameters

Part of your instrument measurement accuracy resides in proper calibration of the vessel empty and full
states. The values associated with these states are usually configured upon starting the instrument via
the Easy Setup menu. Should the configuration performed via the Easy Setup menu prove incorrect,
you will have to recalibrate your instrument and enter new values. This can be done in software (via
the Calibrate menu; see Figure 46) or by emptying and then filling the vessel whose level you want to
measure. The following pages explain how to do this.
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Figure 45 Calibration parameters
Sensor
reference
Full/Span
Empty/Zero
Probe length
NOTICE
Depending on the installation, sensor reference is calculated either from the bottom of
the flange or the last thread of the coupler (see zoom-in on Figure 45 above).
Ullage
Level
+ sensor offset
Distance
Level offset