EB 8389 EN 97
Leakage sensor
Operation > Reset
− Reset 'Leakage detection – Reference test'
7.1.2 Repetition test
The repetition test (Fig.17) measures the re-
sponse of the leakage sensor to process con-
ditions. Process medium, inlet and outlet
pressures as well as the process environment
can have an effect on the sensor's response.
The alarm limits are determined from the
measured data.
The repetition test is performed and ana-
lyzed similar to the reference test described
in section7.1.1. This test must be performed
after the valve has been installed and the
plant has been started up.
If it is not possible to perform the repetition
test, the user-dened alarm limits can be en-
tered (see section7.1.2.2).
While the repetition test is running, the pa-
rameters listed below are automatically de-
activated:
− Enable set point cutoff decrease
− Activation of ramp function
Phase 1: The valve moves to eleven dened
measured points one after the other. After
reaching a measured point and after the
'Settling time before level measuring' has
elapsed, the leakage sensor measures the
sound pressure level.
If the difference between two neighboring
points is larger or equal to the adjusted 'Ac-
tivation level', the valve does not move to the
next points. Instead, Phase 2 starts.
Alarm limit 3
Alarm limit 1
Alarm limit 2
Fig.17: Diagnosis > Leakage detection > Repetition test
To Next Page
Loading...
