Samson 373 Series Operating Instructions

EB 8389 EN 41
Statistical information
Short-term monitoring
In order to be able to recognize any short-
term changes in set point deviation, the posi-
tioner records the set point deviation accord-
ing to the adjusted 'Scan rate short-term his-
togram' and analyses the last 100 measured
values.
− The 'Average value e short' contains the
average class assignment for the last
100 measured values.
The positioner saves the set point deviations
in a circular buffer, which holds 100 mea-
sured values at one time.
On changing scan rate in 'Scan rate short-
term histogram', all existing measured values
are deleted from the circular buffer.
Dening parameters
1. Set 'Scan rate short-term histogram'.
2. Select classication for status messages.
1.
Diagnosis > Statistical information > Set
point deviation histogram e > Short-term
− Scan rate short-term histogram:
1 to 3600s, [1s]
1)
Types3730-2/-3/-4/-5 (1.5x) and Type3731-3:
2.
Settings > Positioner > Error control >
Classication report > Extended > ...
Limit working range
− Down: [
], , , ( ), ( )
− Up: [
], , , ( ), ( )
− Modication impossible (jammed):
[
], , , ( ), ( )
Connection positioner - valve
− No optimum travel transmission (TEST):
[ ], , , ( ), ( )
− Perhaps loose/(TEST): [ ], , , ( ), ( )
− Perhaps range limit:
[ ], , , ( ), ( )
Inner (seat) leakage
− Perhaps existing:
[
], , , ( ), ( )
Type3730-5 (1.6x) and Type3731-5:
2.
Settings > Positioner > Diagnosis
conguration > Classication
− Limit working range:
[
], , , ,
− Connection positioner - valve:
[ ], , , ,
− Inner (seat) leakage: [ ], , , ,
1)
Type3730-4: [864s]
4.4.1 Analysis and monitoring
Analysis of the histogram starts one hour
after the observation period begins.
Ideally, the set point deviation should be
nearly 0%.
Set point deviations greater than 1% follow-
ing in quick succession pinpoint to a limita-
tion of the upper operating range. In this
case, the positioner generates the 'Limit
working range' message with the selected
status classication.
Set point deviations smaller than 1% follow-
ing in quick succession pinpoint to a limita-
tion of the lower working range or to seat
leakage. In this case, the positioner gener-
ates the 'Limit working range' and 'Inner
Note

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English