Setting Process Parameters; Setting Process Alarms - ABB LWT300 series User Manual

Setting process parameters

Certain parameters linked to the process itself need to be configured, chiefly process alarms and
process safety parameters. The following pages explain how to set these parameters.

Setting process alarms

Alarms can be raised when process levels reach certain thresholds. Low and high alarm thresholds are
factory set and cannot be modified. Low alarms are set at 3.6 mA and high alarms are set at 21.5 mA.
Other process alarm parameters are configured from the Process Alarm menu.
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Figure 32 The Process Alarm menu
Figure 33 illustrates these alarm-triggering thresholds.
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Figure 33 Measurement concepts
Sensor
reference
Full/Span
Empty/Zero
Probe length
The following pages explain how to set those threshold values.
Ullage
Level
+ sensor offset
20 mA (URV)
100%
Distance
4 mA (LRV)
0%
Level offset
Configuring the instrument 49