Bronkhorst®
Instruction Manual mini CORI-FLOW ML120
9.17.097G
61
Symptom
Possible cause
Action
No flow (sending a setpoint has no
effect)
No fluid supply
Check upstream components for obstruction,
e.g.:
·
fluidic 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
Instrument not mounted
horizontally or ambient conditions
differ significantly from conditions
stated on instrument label
·
Follow mounting instructions
·
Use instrument in conditions it was designed
for
·
Adjust zero point (see
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)
Continuous maximum measured
value or output signal
Inlet pressure too high
Check inlet pressure
Control valve (normally open)
failure
Return equipment to factory
Sensor failure
Return equipment to factory
Flow rate decreases gradually
Condensation on measuring tube
(might occur with NH
3
and some
hydrocarbons, such as C
3
H
8
, C
4
H
10
)
Increase media temperature to above ambient
conditions