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EB 8389-1S EN
Leakage sensor
9.2
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 the tightly shut posi-
tion or whenever the sound level changes by
2 dB. A mean value is calculated from the
recorded sound level and last four recorded
sound levels.
If this value deviates from the previous mean
value by 'Sensitivity sound level', the new
mean value is saved in the short-term moni-
toring.
The last 'Mean value' recorded in the short-
term monitoring is indicated.
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
Measured data
assessment
folder.
Defining parameters
1. Enter the sensitivity sound level.
1.
Diagnostics > Monitoring/tests > Leakage
sensor > Short-term monitoring
−
Sensitivity sound level: 3 to 255 dB, [3 dB]
Fig. 13:
Start-up > Reference graphs > Leakage sensor >
Short-term monitoring
