Samson 3730 Series Operating Instructions

58 EB 8389-1S EN
Leakage sensor
Phase 1 successful: The sound pressure level
exceeded the adjusted 'Sensitivity sound level'
(10 dB) between set points 4 and 5. Phase 2
starts.
If the 'Sensitivity sound level' is not reached
after the valve has moved to all eleven set
points, the test is canceled. The canceled test
is logged with a time stamp and the 'Test in-
formation' reading indicates 'Test failed:
sound level change too small'.
Phase 1 not successful: The difference in sound
pressure level between two neighboring set points
is smaller than the 'Sensitivity sound level'
(10dB). The process reference test is canceled.
Phase 2: A 0.30 % band is placed around
the last set point that the valve moved to.
One third of this band lies in front of the set
point that the valve moved to and two thirds
of the band lies behind it. The band itself is
subdivided into eleven xed points. Each
xed point is located at a distance of 0.03%
to the next point. The valve moves to the new
xed points one after the other. After reach-
ing a xed point and after the 'Settling time
before sound level measurement' has
elapsed, the leakage sensor measures the
sound pressure level.
Phase 2 successful: The 'Sensitivity sound level'
(10 dB) is reached between the rst and last
newly dened points. The process reference test is
successfully completed.
The process reference test is successful when
the difference between the rst and last new-
ly dened points is larger or equal to the ad-
justed 'Sensitivity sound level'.
If the 'Sensitivity sound level' is not reached
after the valve has moved to all eleven newly
dened points, then the change in sound
pressure 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 'Sensitivity sound
level' (10 dB). Phase 3 starts.

Samson 3730 Series Specifications

General

Brand	Samson
Model	3730 Series
Category	Valve Positioners
Language	English