Bronkhorst®
Instruction Manual MI Series Industrial mini CORI-FLOW™
9.17.120A
49
Symptom
Possible cause
Action
Inlet pressure or differential
pressure out of bounds
Set inlet pressure to a value within
specifications
Measured value 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/decrease outlet pressure
Process outlet blocked
Check process outlet and downstream piping
·
Measured value or output signal
(much) lower than setpoint
·
Pressure signal gradually
decreasing without setpoint
change
Inlet pressure or differential
pressure too low
·
Increase inlet pressure
·
Use instrument in conditions it was designed
for
Process gas condensation
Decrease inlet pressure or increase gas
temperature
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
ambient conditions changed
significantly
·
Use instrument in conditions it was designed
for
·
Adjust zero point (see
)
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
Valve fully open
·
Close valve
·
Check if valve is in safe state (normally open
valves); remove cause if necessary (see
Sensor failure
Return equipment to factory