Siemens SITRANS LG250 Operating Instructions Manual

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49PBD-51041048 SITRANS LG250 - Operating Instructions44277-EN-2002129 Diagnostics and servicing9.1 MaintenanceIf the device is used properly, no special maintenance is required innormal operation.The cleaning helps that the type label and markings on the instrumentare visible.Take note of the following:• Use only cleaning agents which do not corrode the housings, typelabel and seals• Use only cleaning methods corresponding to the housing protec-tion rating9.2 Diagnosis memoryThe instrument has several memories available for diagnostic pur-poses. The data remain there even in case of voltage interruption.Up to 100,000 measured values can be stored in the sensor in a ringmemory. Each entry contains date/time as well as the respectivemeasured value. Storable values are for example:• Distance• Filling height• Percentage value• Lin. percent• Scaled• Current value• Measurement reliability• Electronics temperatureWhen the instrument is shipped, the measured value memory isactive and stores distance, measurement reliability and electronicstemperature every 3 minutes.In "Extended adjustment" you can select the respective measuredvalues.The requested values and recording conditions are set via a PC withPACTware/DTM or the control system with EDD. Data are thus readout and also reset.Up to 500 events are automatically stored with a time stamp in thesensor (non-deletable). Each entry contains date/time, event type,event description and value. Event types are for example:• Modification of a parameter• Switch-on and switch-off times• Status messages (according to NE 107)• Error messages (according to NE 107)The data are read out via a PC with PACTware/DTM or the controlsystem with EDD.MaintenanceCleaningMeasured value memoryEvent memory