Scraper Pig Detection Settings - Siemens SITRANS F Series Operating Instructions Manual

A.9.14

Scraper pig detection settings

Table A-141 Scraper pig detection settings
Modbus Data type /
register Size in bytes
1802 Unsigned / 1
1803 Float / 4
1837 Float / 4
1839 Float / 4
1841 Unsigned / 1
1842 Unsigned / 1
1843 Unsigned / 1
1844 Float / 4
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD
Parameter Description
Enable scraper Enables or disables scraper pig
pig detection detection
Minimum length Length of the shortest expected
pipeline pig to be detected
Maximum Length of the longest expected
length pipeline pig to be detected
Signal thresh‐ Signal amplitude threshold for
old of scraper triggering the scraper pig detec‐
pig tion.
Blocked paths Minimum number of paths re‐
to start timer quired to be below the signal
threshold to initiate pig detec‐
tion. 0 selects the number of in‐
stalled paths.
Unblocked Minimum number of paths re‐
paths to end tim‐ quired to be above the signal
er threshold before evaluating
whether or not a pig as
passed. 0 selects the number of
installed paths.
Percent change Maximum allowed percent
of VoS accepted change in liquid sound velocity
before and after pig passage.
Used to suppress implausible
receive signals due to reflec‐
tions off the pig.
Max. length of Used to suppress plausible re‐
pig reflections ceive signals due to reflections
off the interior pig surface hav‐
ing the specified maximum
length. Setting value to 0 disa‐
bles this filter.
Modbus communication
A.9 Modbus holding registers tables
Default value Value range /
[units] Setting options
(units register)
0
● 0: Disabled
● 1: Enabled
0 0 – 30
[m]
0 0 – 30
[m]
12.0 -20 – 100
[dBmV]
0 0 - 5
0 0 - 5
5 0 - 50
[%]
0.05 0 - 5
[m]
Access
level
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
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