Description
2.5 Functional description
SITRANS SL
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Operating Instructions, 12/2010, A5E01132948-04
2.5.3
Maintenance and fault messages
The SITRANS SL carries out continuous self-monitoring, and outputs alarms and warnings
to indicate maintenance requirements or a system fault. The information is output as plain
text on the LUI display, where symbols identify the category and the severity of the fault.
Alarm categories:
●
Maintenance (system must be cleaned or repaired)
●
Process value (problem with external sensor, or process conditions outside the
permissible range for SITRANS SL)
●
Configuration (SITRANS SL is not correctly configured)
Severity:
●
Fault (measurements could not be carried out)
●
Warning (measurements may be inaccurate, or the system will soon shut down
measuring mode if an intervention is not made)
●
Advanced warning/information (measurements are carried out)
The two binary (relay) outputs can be configured freely for the alarm output.
The response of the analog outputs in the event of an alarm is configurable; possible actions
are:
●
Off (current measured value is displayed)
●
Last measured value (freezing of last value displayed)
●
Standard level (setting to predefined value)
●
3 mA (Namur NE43 fault status)
In addition, the transmission is available as an output variable.
Note
Specific requirements for the measuring point might require the utilization of special sensor
equipment. The possibilities for adapting the sensors are:
Special materials for purging tubes (on request)
Various types/sizes of sensor flanges
Ex-proof sensor configurations