Samson 3730-3 - Analysis and Monitoring

46 EB 8389 EN
Statistical information
The positioner saves the cycles in a circular
buffer, which holds 100 measured values at
one time.
− The 'Average value e short' contains the
average class assignment of cycle
heights for the last 100 measured values.
Dening parameters
1. Select the type of stem seal.
When 'Other' is selected for 'Stufng
box', the additional parameter 'Max. cy-
cle counter limit' must also be set.
2. Select classication for status messages.
1.
Settings > Identication > Positioner >
Valve
− Stufng box:
[-/-], Self-adjusting, Adjustable packing,
Bellows seal, Other
− Max. cycle counter limit
1)
:
1 to 1000000000, [1000000]
Types3730-2/-3/-4/-5 (1.5x) and Type3731-3:
2.
Settings > Positioner > Error control >
Classication report > Extended > ...
External leakage
− Perhaps soon expected:
[
], , , ( ), ( )
Type3730-5 (1.6x) and Type3731-5:
2.
Settings > Positioner > Diagnosis
conguration > Classication
− External leakage: [
], , , ,
1)
Setting only with 'Stufng box' = Other
4.5.1 Analysis and monitoring
Analysis of the histogram starts directly af-
ter the change to manual or automatic
mode.
The load on the bellows and/or packing can
be read from the 'Dynamic stress factor' pa-
rameter. The value is determined from the cy-
cle spans or cycle heights and takes into ac-
count the type of packing used in the valve.
An 'External leakage' message is generated
with the selected status classication whenev-
er:
− The number of measured cycle spans ex-
ceeds 450000 when 'Self-adjusting' is
selected as the stem seal.
− The number of measured cycle spans ex-
ceeds 180000 when 'Adjustable pack-
ing' is selected as the stem seal.
− The number of measured cycle spans ex-
ceeds 90% of the 'Max. cycle counter
limit' when 'Other' is selected as the stem
seal.
− The number of measured cycle heights
exceeds 180000 when 'Bellows seal' is
selected as the stem seal.
Diagnosis > Statistical information > Cycle
counter histogram
− Dynamic stress factor
Diagnosis > Status messages > Extended
− External leakage