KROHNE OPTISONIC 7060 EN - Manual (Page 46)

OPTISONIC 7060
Electrical & mechanical installation manual 730962.31.00 page 46 of 52
7 Troubleshooting
If the routine checks described in Section 5.2 or the functional checks described in Section
4.1.2 indicate that the device is not functioning properly, the following table will help you
diagnose the fault. If you still cannot find the cause for the fault, you can use the
ALTO IV program to carry out a more detailed fault diagnosis (see software manual, service
manual).
Display, parameter Possible cause Corrective action
Faulty power supply • Check the input voltage at terminals 1 and 2
• Check cables and terminal connections
Important
Take the relevant safety precautions!
• No display
• No pulse frequency
• No active status
signal
Defective device Contact the manufacturer
Transducer(s) are
dirty Clean the transducer(s)
Transducer(s) are
defective Replace the transducer(s) (see service manual)
“Warning” on the
LCD
Cabling swapped
when transducer was
cleaned Check and, if necessary, correct
Different velocities of
sound in the
individual paths Transducer or
electronics fault Replace the transducer(s) (see service manual)
Note
Temperature stratification can result in differences
between the individual paths, especially with very low
flow (higher temperatures generate higher velocities of
sound). Even when the plant is being filled or when it is
shut down, different velocities of sound can occur on
the individual paths as a result of gas stratifications.
Implausible sound
velocity Gas analysis,
pressure or
temperature
measurement
incorrect
Transducer(s)
damaged during
maintenance Replace the transducer(s) (see service manual) • Lower signal-to-
noise ratio and
reception sensitivity
• Increased number
of rejected
measurements in
individual paths
Additional sources of
noise due to a valve
that is not fully open,
fittings, noise sources
near the device Check the measurement plausibility and number of
rejected measurements and, if necessary, remove
noise sources.
Different gas
composition or
process pressure No work required on the device Increased reception
sensitivity
Transducer(s) are
dirty Clean the transducer(s)
Increased number of
rejected
measurements in all
paths Additional noise
sources Remove noise sources
Gas velocity outside
the measurement
range