Bronkhorst®
Instruction Manual FLOW-CONTROL series
9.17.115B
13
5
Troubleshooting and service
For a correct analysis of the proper operation of an instrument, it is recommended to disconnect the unit from the process
line and check it without applying fluid supply pressure. In case the unit is dirty or clogged, this can be ascertained
immediately by loosening the fittings and performing a visual inspection.
If you suspect leakage, do not disassemble the instrument for inspection, but contact Mass Flow ONLINE for service or
repairs.
5.1
Common issues
Symptom
Possible cause
Action
Flow present while valve is closed
Valve leaking
Contact Mass Flow ONLINE
No flow, opening the needle valve
has no effect
No fluid supply
Check upstream components for obstruction,
e.g.:
·
fluidic lines
·
valves
·
filters
Process outlet blocked
Check process outlet and downstream piping
for obstruction
Valve may have been tightened
with too much force, jamming the
needle into the valve seat. Turning
the control knob only loosens it.
Contact Mass Flow ONLINE
5.2
Service
For information about repairable parts and service, please visit the 'Service and support' section of
www.massflow-
online.com
.
