Troubleshooting Symptom: (Zero flow and zero sound velocity)
Symptoms / Alarms Diagnostics Cause Remedy
Display shows no flow and
measured sound velocity is 0
m/s.
No Alarm codes
● Path 1 state: 0-0
● Path 2 state: 0-0
No paths installed
● At least 1 path must be
installed for flow
measurement to start.
● Follow instructions in
sensor setup wizard while
ensuring that at least 1
path is selected from the
installed paths multi-
selection menu.
Display shows no flow and
measured sound velocity is 0
m/s.
With Alarm codes:
14: Path1 No Signal
and / or
15: Path2 No Signal
and
34: Invalid flow meas.
● RxGain > 60
● No Rx signal present on
any path
Pipe not completely filled with
liquid.
● 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 (see A2 (Page 95)).
● Avoid installation of
sensors on top or bottom
of horizontal pipe.
● Cable broken, detached
or attached to the wrong
F-connector channels.
● Broken or misswired
cables.
● Ensure that the sensor
cables are properly
connected and routed
between the sensors and
transmitter.
● Verify continuity by
evaluating the DC
resistance between the
cable center conductor
and shield with the
sensors connected.
Incorrectly installed sensors
or incorrect setup parameter‐
ization.
● Verify pipe dimensions
● Verify sensor selection,
mounting configuration
and spacing.
● Ensure that ultrasonic
couplant is applied
(grease or dry couplant)
(see A4 (Page 99)).
Damaged / defective sensors
or frontend hardware.
Verify operation of sensor
and frontend hardware using
a pipe simulator "Test block"
(see A1 (Page 93))
Diagnostics and troubleshooting
9.2 Troubleshooting Guide
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 89
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