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Diagnostics and troubleshooting
11.1
Calibration information
The SITRANS TDL system is factory calibrated using certified gas mixtures that can be traced to
national or international standards . The device uses an internal in-line reference gas cell for real
time verification of the calibration status or a process gas normally present in the process gas
stream that is used to perform permanent self supervision of the analyzer.
11.2
Device status symbols
Device status is shown using symbols on the local display. Additionally, the symbol and
respective text message for each device status can be seen in remote engineering, asset
management or process control systems.
Locally, alarms are shown as a symbol in the lower line of the display. If several diagnostic
states are active at the same time, the symbol for the most critical state is shown.
Device status characteristics
The symbols used on the local display are based on NAMUR status signals, whereas symbols
used in SIMATIC PDM are based on Siemens standard alarm classes.
Note
Device status priority conflict - Namur vs Siemens standard
When more than one diagnostic event is active simultaneously, a conflict in priorities may arise.
In this case, the Namur symbol on the local display will differ from that shown in SIMATIC PDM.
• For example: if both diagnostic states "Maintenance demanded" and "Configuration error"
are active,
– Local display (using Namur symbols) will show "Configuration error" as higher priority.
– SIMATIC PDM (using Siemens standard symbols) will show "Maintenance demanded" as
Be aware of the priority for each device status, depending on the interface used.
SITRANS TDL
Operating Instructions, 05/2023, A5E51429088_AA
higher priority.
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