Troubleshooting Symptoms: (Active flow with measurement errors or alarms)
Symptoms / Alarms Diagnostics Cause Remedy
Display shows active flow
with large sound velocity er‐
ror.
No Alarm codes
● High positive or negative
sound velocity error.
● Measured flow not the
expected value.
Incorrectly installed sensors
or incorrect setup parameter‐
ization.
Verify pipe dimensions, sen‐
sor selection, mounting con‐
figuration and spacing.
The entered Expected sound
velocity is far from the actual
fluid sound velocity.
Optimal performance is ach‐
ieved when the sensors are
spaced correctly based on
the actual fluid sound veloci‐
ty. If possible, perform the
sensor setup wizard again us‐
ing the initially measured
sound velocity for the expec‐
ted sound velocity.
Display shows active flow.
With Alarm code:
28: Configuration 1
Duplicate assignment of pres‐
sure, density, viscosity or
temperature. Same process
value assigned to more than
1 analog input (including RTD
inputs).
Check "inputs and outputs"
channels assignment. Reas‐
sign inputs or disable unused
inputs.
RTD input conversion indi‐
cates an out-of-range temper‐
ature (limited between -50 to
250 °C).
● Check the RTD
connections to CH5
and/or CH6.
● Ensure that the selected
RTD type (100, 500 or
1000 ohm) matches the
resistance of the installed
RTD.
● Ensure that the user RTD
calibration parameters
(offset and slope) are set
correctly in the RTD setup
menu.
Display shows active flow.
With Alarm code:
7: Flow measurement
Measured transit-time
(sound velocity) is outside the
allowed range for the entered
sensor spacing.
Applications involving multi‐
ple fluid compositions may
experience a significant var‐
iation in sound velocity. If this
is expected then ensure that
the sensor setup wizard is
performed using the nominal
fluid sound velocity.
Optimal performance is ach‐
ieved when the sensors are
spaced correctly based on
the actual fluid sound veloci‐
ty. If possible, perform the
sensor setup wizard again us‐
ing the initially measured
sound velocity as the expec‐
ted sound velocity.
Diagnostics and troubleshooting
9.2 Troubleshooting Guide
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 91
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