Samson 373 Series Operating Instructions

98 EB 8389 EN
Leakage sensor
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 and 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
repetition test is canceled.
Phase 2: A 0.30% band is placed around
the last point that the valve moved to. One
third of this band lies in front of the point
that the valve moved to and two thirds of the
band lies behind it. The band itself is subdi-
vided into eleven new measured points. Each
measured point is located at a distance of
0.03% to the next point. The valve moves to
the new 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.
Phase 2 successful: The 'Activation level' (10 dB)
is reached between the rst and last newly de-
ned points. The repetition test is successfully
completed.
The repetition test is successful when the dif-
ference between the rst and last newly de-
ned points is larger or equal to the adjusted
'Activation level'.
If the 'Activation level' is not reached after
the valve has moved to all eleven newly de-
ned points, then the change in sound pres-
sure level is too low. In this case, phase 3
starts.
Phase 2 not successful: The difference in sound
pressure level between the rst and last newly de-
ned points is lower than 'Activation level'
(10dB). Phase 3 starts.

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English