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Maintenance 8
Maintenance of the Opsis LD500 system should be scheduled and followed on a regular
basis to ensure proper operations and prevent the possibility of malfunctions. Maintenance
records should be kept in a log book at the monitoring location.
8.1 Check list for preventive
maintenance
The following actions should be taken once a week:
• Make a System check. All parameter values must be within their permissible lim-
its. See the LD500 Analyser Reference Manual for explanations.
• Check the recorded light levels. If the levels have dropped, check the windows of
the light path and the alignment. Clean and adjust if necessary.
• Check the standard deviations.
Once per month the following should be performed:
• Backup of data from the hard disk.
• Visual inspection of the system; the emitter, the receiver, the optical fibres.
• Inspection and control of purge air systems.
• Cleaning of windows if necessary.
Once per year:
• Span calibration.
• Fill up the gas inside the wavelength reference cell.
• Examine the complete system, including re-certification of all test gases.
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