Bronkhorst®
Instruction Manual mini CORI-FLOW™ M1x
9.17.050O
46
Symptom
Possible cause
Action
voltage. If valve does not open, clean parts
and re-adjust valve
Sensor failure
Return equipment to factory
·
Control behavior unstable
·
Red LED flashes irregularly
Gas accumulation in tubing
Flush the system to remove gas
Tip: use frequency or density signal to detect
presence of gas bubbles
Measurement disturbed by
mechanical vibration
·
If possible, avoid installation in close
proximity of mechanical vibration
·
Reduce sensitivity to vibrations by using a
mass block, shock absorbers, and flexible
tubing
Inlet pressure unstable
Eliminate pressure fluctuations, e.g. by
installing a pressure regulator
Wrong controller settings
Adjust settings (e.g. with FlowPlot)
No flow (sending a setpoint has no
effect)
No fluid supply
Check upstream components for obstruction,
e.g.:
·
fluid lines
·
valves
·
filters
Inlet pressure or differential
pressure out of bounds
Set inlet pressure to a value within
specifications
Flow rate rises, but never reaches
setpoint
Piping, filters and/or control valve
clogged or blocked
·
Clean system (flush with clean, dry air or a
non-aggressive cleaning liquid (e.g. ethanol
or isopropyl alcohol)
·
For external proportional control valves:
supply 0…15 Vdc and operational inlet
pressure to valve and slowly increase
voltage. If valve does not open, clean parts
and re-adjust valve
Inlet pressure too low
Increase inlet pressure
Outlet pressure too high
Check outlet pressure
Process outlet blocked
Check process outlet and downstream piping
Measured value or output signal
much lower than setpoint
Inlet pressure or differential
pressure too low
·
Increase inlet pressure
·
Use instrument in conditions it was designed
for
Piping or filters blocked or
contaminated
Clean system
Sensor blocked or contaminated
Clean sensor
Valve blocked or contaminated
Clean valve
Supplied fluid type does not match
configured fluid type
Supply equipment with other fluid or change
fluid type in instrument configuration
Measured value or output signal
indicates a flow, while there should
be none
Mounting orientation and/or
process conditions changed
significantly
·
Install instrument according to
·
Use instrument in conditions it was designed
for
·
Control valve leaking
Clean valve; if problem persists, return
equipment to factory
System leakage
Check the system for leakage. Follow vendor
instructions when installing third party
components (e.g. adapters, tubing, valves)
