EB 8389 EN
103
Leakage sensor
7.2 Short-term monitoring
Short-term monitoring provides an insight in-
to short-term changes in the sound level
while the valve is tightly shut.
Data are recorded in the background re-
gardless of the operating mode selected. Da-
ta logging does not need to be activated.
The leakage sensor records the sound level
when the valve leaves tight shut position or
whenever the sound level changes by 2 dB.
A mean value is calculated from the record-
ed sound level and last four recorded sound
levels. If this mean value deviates from the
last mean value in short-term monitoring by
the amount entered in 'Activation point
short-term', it is saved as the new mean val-
ue in short-term monitoring.
The last 'Level average short-term' is indicat-
ed.
The positioner saves the mean values of the
sound level and valve travel in a circular buf-
fer, which holds 30 measured values at one
time together with a time stamp. The saved
values can be read in the
Analysis of mea-
sured data
folder.
Defining parameters
Diagnosis > Leakage detection > Short-term
−
Activation point short-term:
3 to 255 dB, [3 dB]
Fig. 19:
Diagnosis > Leakage detection > Short-term
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