Siemens SITRANS LG250 Operating Instructions Manual

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50 PBD-51041048SITRANS LG250 - Operating Instructions44277-EN-200212The echo curves are stored with date and time and the correspondingecho data. The memory is divided into two sections:Echo curve of the setup: This is used as reference echo curve forthe measurement conditions during setup. Changes in the measure-ment conditions during operation or buildup on the sensor can thusbe recognized. The echo curve of the setup is stored via:• PC with PACTware/DTM• Control system with EDD• Display and adjustment moduleFurther echo curves: Up to 10 echo curves can be stored in a ringbuffer in this memory section. Additional echo curves are stored via:• PC with PACTware/DTM• Control system with EDD• Display and adjustment module9.3 Status messagesThe instrument features self-monitoring and diagnostics accordingto NE 107 and VDI/VDE 2650. In addition to the status messages inthe following tables there are more detailed error messages availableunder the menu item "Diagnostics" via the respective adjustmentmodule.The status messages are divided into the following categories:• Failure• Function check• Out of specification• Maintenance requirementand explained by pictographs:41 2 3Fig. 21: Pictographs of the status messages1 Failure - red2 Out of specification - yellow3 Function check - orange4 Maintenance - blueFailure: Due to a malfunction in the instrument, a fault message isoutput.This status message is always active. It cannot be deactivated by theuser.Function check: The instrument is being worked on, the measuredvalue is temporarily invalid (for example during simulation).This status message is inactive by default.Echo curve memoryStatus messages