Samson 373 Series Operating Instructions

94 EB 8389 EN
Leakage sensor
7.1 Start-up of the leakage
sensor
To be able to use the full scope of functions,
the response of the leakage sensor to stan-
dardized conditions and to the prevailing
process conditions must be measured. Fur-
thermore, the limit to activate the alarm must
be entered.
7.1.1 Reference test
The reference test (Fig.16) measures the
response of the leakage sensor. We
recommend performing this reference test.
On request, it can also be performed by
SAMSON and must not be performed
again. In this case, the standard conditions
are:
• Medium = air
• Inlet pressure = 4bar
• Output pressure = atmosphere
Default values of alarm limits are A2 =
15dB and A3 = 25dB. If the leakage sen-
sor has been tted later onto the valve, the
alarm limits must be manually congured
or adjusted by performing a manufacturer
or process reference test before the leakage
sensor can be used (see section7.1.1).
While the reference 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 dened
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.
Phase 1 successful: The sound pressure level ex-
ceeded the adjusted 'Activation level' (10dB) be-
tween set points 4 and 5. Phase 2 starts.
If the 'Activation level' is not reached after
the valve has moved to all eleven measured
points, the test is canceled. The canceled test
is logged with a time stamp. The 'Test state'
reading indicates 'Test failed: level change
too low'.
Phase 1 not successful: The difference in sound
pressure level between two neighboring set points
is smaller than the 'Activation level' (10dB). The
reference test is canceled.

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English