EB 8389 EN 45
Statistical information
4.5 Cycle counter histogram
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
• • • • • •
The cycle counter histogram provides a sta-
tistical analysis of the cycles. As a result, the
cycle counter also provides information on
the dynamic stress of a bellows seal and/or
packing.
Data are recorded in the background re-
gardless of the operating mode selected. Da-
ta logging does not need to be activated.
The positioner records the number of cycles
when the 'Stufng box' (stem seal) setting is
set to 'Self-adjusting', 'Adjustable packing',
'Other' or '-/-'. A valve cycle span starts at
the point where the valve stroke changes
direction until the point where it changes
direction again.
The positioner records the cycle height when
the 'Stufng box' (stem seal) setting is set to
'Bellows seal'. The cycle height is the travel
performed between two changes in direc-
tion.
The cycle spans or cycle heights are as-
signed to classes. The distribution showing
how often the cycle occurred within a class is
shown in a bar graph.
− The 'Average value z long' indicates the
average class assignment of the cycle
height over the 'Number of measurement
values'.
− The 'Number of measurement values'
shows the total number of values record-
ed.
The measured data are saved in a non-vola-
tile memory in the positioner every 24 hours.
Short-term monitoring
To recognize short-term changes in the cycle
spans or cycle height, the positioner ana-
lyzes the last 100 cycle heights or cycle
spans.
Fig.5: Diagnosis > Statistical information > Cycle counter histogram
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