Diagnostics and troubleshooting
Flowfit CYA27
32
Hauser
8
Diagnostics and troubleshooting
8.1
General troubleshooting
Faults at the measuring point can affect not only the assembly but also the sensors and
transmitters used. For this reason, the respective Operating Instructions of the sensors and
transmitters must also be observed for diagnostics and troubleshooting.
Diagnostics/troubleshooting can be performed directly on the assembly or its process
integration as well as using the sensor measured values and the information displayed on
the transmitter at the measuring point.
If a status indication light is used on the assembly, possible errors such as absent flow or
Namur F can also be detected more easily (→ 12).
Contact the Service Department if you cannot rectify the error yourself.
8.2
Faults in the assembly and process integration
Problem
Possible cause
Tests and/or remedial measures
No flow
Closed valves
‣
Open valve at outlet module
‣
Open valve at inlet module
‣
Check existing valves in the process connection (supply
and discharge line)
Blocked filter in inlet line
‣
Check and, if necessary, clean or replace the filter
medium
Soiled assembly/pipes
‣
Clean the assembly and, if necessary, the supply and
discharge lines
Counterpressure through
return line is too high
‣
Check return line, remove unnecessary flow resistance
‣
If necessary, shorten the length of the return line or
route it a different way
Incorrectly configured
pressure-reducing valve in
supply line
‣
Check and correct the pressure setting on the pressure-
reducing valve
Highly fluctuating
measured signal of
membrane-covered
sensors
Insufficient flow
‣
Check flow configuration
‣
Readjust flow at the valve of the inlet module
Sampling is open or
ongoing
‣
Close the sampling valve
‣
Set the sensor measured values on the transmitter to
HOLD
for the duration of sampling
‣
After sampling, cancel the
HOLD
on the sensor
measured values on the transmitter.
Air is sucked into
assembly when the
sampling valve is
open
Downward-sloping return
line causes negative
pressure
‣
Increase flow at the valve of the inlet module to a
minimal degree
‣
Reduce flow at the valve of the outlet module
‣
After sampling, return the flow setting or the valve
position of the assembly to the original setting
Electrolyte in
membrane-covered
sensors requires
frequent replacement
Counterpressure in
assembly is too high
‣
Check valve position at the outlet module and open if
necessary
‣
Check return line, remove any unnecessary flow
resistance
‣
If necessary, shorten the length of the return line or
route it a different way
