Symptoms / Alarms Diagnostics Cause Remedy
Display shows no flow and
measured sound velocity is 0
m/s.
With Alarm code:
36: Configuration 2
● No Rx signal present on
any path
The pipe dimensions are too
small for the selected sensor
size or frequency.
● Verify pipe dimensions,
fluid selection, and
sensor selection.
● Application may not be
suitable for the purchased
sensor size.
Display shows no flow and
measured sound velocity is 0
m/s.
With Alarm code:
34: Invalid flow meas.
Rx signal is intermittently
present but does not show a
proper leading baseline:
For comparison Rx signal
with proper leading baseline:
Incorrectly installed sensors
or incorrect setup parameter‐
ization.
● Verify actual pipe
dimensions against
entered values.
● Verify sensor selection,
mounting configuration
and spacing (see A4
(Page 99)).
Incorrect Expected fluid
sound velocity.
● A very large error in the
expected fluid sound
velocity (or sound speed)
can result in a large
sensor spacing error and
cause the meter to search
for the signal in the wrong
transit-time range.
● Verify that the entered
expected sound velocity
is correct for the
application.
Pipe is mostly empty causing
meter to operate on pipe
noise.
● Make sure that the pipe is
completely filled with
liquid, or relocate sensors
to a section of pipe that is
expected to be normally
full.
● Avoid installation of
sensors on top or bottom
of horizontal pipe (see A4
(Page 99)).
Diagnostics and troubleshooting
9.2 Troubleshooting Guide
SITRANS FST030 (Modbus)
90 Operating Instructions, 08/2018, A5E37367739-AD
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