EB 8389 EN 37
Statistical information
4.3 Travel histogram x
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• • • • • •
The valve position histogram is a statistical
analysis of the plotted valve positions. It pro-
vides information about the range in which
valve mainly works during its service life and
whether the working range is possibly shift-
ing.
Data are recorded in the background re-
gardless of the operating mode selected.
Data logging does not need to be activat-
ed.
The positioner records the valve position ev-
ery second and assigns the data into pre-
dened valve position classes. The distribu-
tion showing how often the sound level oc-
curred within a valve position class is shown
in a bar graph.
− The 'Average value x long' indicates the
average class assignment of the valve
position over the 'Observation period.'
− The 'Number of measurement values'
shows the total number of values were
recorded during the 'Observation peri-
od'.
− 'Observation period'
The measured data are saved in a non-vola-
tile memory in the positioner every 24 hours.
Short-term monitoring
In order to be able to recognize any short-
term changes in valve position, the position-
er records the valve positions according to
the adjusted 'Scan rate short-term histogram'
and analyses the last 100 measured values.
Fig.3: Diagnosis > Statistical information > Travel histogram x
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