EB 8389 EN 93
Leakage sensor
7 Leakage sensor
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
• • •
By upgrading the positioner with a leakage
sensor, it is possible to detect seat leakage
when the valve is in the closed position. To
achieve this, the leakage sensor measures
the sound pressure level (dB) while the valve
is tightly shut and compares the current
sound pressure level with predened alarm
limits. The positioner generates a message if
the current sound pressure level exceeds one
of the alarm limits.
Requirements for using the seat leakage
detection:
1. A leakage sensor is attached to the
valve. Refer to the standard mounting
and operating instructions of the posi-
tioner.
2. The leakage detection option has been
selected.
3. The tight-closing function has been acti-
vated.
4. The leakage sensor has been put into op-
eration (see section7.1).
2.
Diagnosis > Leakage detection
− Identication Options: Leakage detection
3.
Settings > Positioner > Reference variable
− Enable set point cutoff decrease
(Code14): [On]
− Set point cutoff decrease (Code 14):
0.0 to 49.9%, [1.0%]
Alarm limit 3
Alarm limit 1
Alarm limit 2
Fig.16: Diagnosis > Leakage detection > Reference test
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