Maintenance; Collecting Data; Inspection Of Measured Data; Sample Rate - Elster 6 Series Operation And Maintenance Manual

Maintenance

8
8 Maintenance
The UFM contains no moving parts. The transducers are the only
components that are in contact with the gas medium. The materials used for
the transducers are resistant to the conditions that were clearly specified for
the measuring instrument. As a result the transducers and the electronics
are virtually maintenance free.
However, Elster recommends inspection of the UFM at regular intervals, for
example weekly or monthly evaluations. In case of deterioration of the
meter, appropriate measures should be taken before a serious failure
occurs.

8.1 Collecting Data

A quick health check of the meter can be done through the Basic display
screen on the front panel. This is described in  Chapter 7.3 Basic Display
(p.36). However this will only provide you with meter information in its current
status. For a more detailed indication of the meter's condition, Elster
recommends performing a trend analysis on the meter's measured data
(comparison of recent measured data with results from a past period of
time). The software package SonicExplorer is specially designed for this
purpose. More information about this software package can be obtained at
Elster, your local agent, or online at http://www.elster-
instromet.com/en/sonicexplorer. It is a recommended engineering
practice to record the measured data at regular intervals.

8.2 Inspection of Measured Data

The following general rules provide a good basis for analysing the measured
data:
8.2.1

Sample Rate

The process of travel time measurement for all paths is repeated a number
of times per second. This number is called Sample Rate. Typically this is a
stable value of about 20 with a variation of -1.
Page 50 of 68 Operation and Maintenance UFM Series 6
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