Siemens SITRANS FST030 - Scraper Pig Detection Settings

A.9.14 Scraper pig detection settings
Table A-141 Scraper pig detection settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
1802 Unsigned / 1 Enable scraper
pig detection
Enables or disables scraper pig
detection
0
● 0: Disabled
● 1: Enabled
Read /
write
1803 Float / 4 Minimum length Length of the shortest expected
pipeline pig to be detected
0
[m]
0 – 30 Read /
write
1837 Float / 4 Maximum
length
Length of the longest expected
pipeline pig to be detected
0
[m]
0 – 30 Read /
write
1839 Float / 4 Signal thresh‐
old of scraper
pig
Signal amplitude threshold for
triggering the scraper pig detec‐
tion.
12.0
[dBmV]
-20 – 100 Read /
write
1841 Unsigned / 1 Blocked paths
to start timer
Minimum number of paths re‐
quired to be below the signal
threshold to initiate pig detec‐
tion. 0 selects the number of in‐
stalled paths.
0 0 - 5 Read /
write
1842 Unsigned / 1 Unblocked
paths to end tim‐
er
Minimum number of paths re‐
quired to be above the signal
threshold before evaluating
whether or not a pig as
passed. 0 selects the number of
installed paths.
0 0 - 5 Read /
write
1843 Unsigned / 1 Percent change
of VoS accepted
Maximum allowed percent
change in liquid sound velocity
before and after pig passage.
Used to suppress implausible
receive signals due to reflec‐
tions off the pig.
5
[%]
0 - 50 Read /
write
1844 Float / 4 Max. length of
pig reflections
Used to suppress plausible re‐
ceive signals due to reflections
off the interior pig surface hav‐
ing the specified maximum
length. Setting value to 0 disa‐
bles this filter.
0.05
[m]
0 - 5 Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 335