Troubleshooting And Service; Common Issues; Service - BRONKHORST FLOW-CONTROL Series Instruction Manual

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
Flow present while valve is closed
No flow, opening the needle valve
has no effect
5.2

Service

For information about repairable parts and service, please visit the 'Service and support' section of www.massflow-
online.com.
9.17.115B
Bronkhorst®
Possible cause
Valve leaking
No fluid supply
Process outlet blocked
Valve may have been tightened
with too much force, jamming the
needle into the valve seat. Turning
the control knob only loosens it.
Instruction Manual FLOW-CONTROL series
Action
Contact Mass Flow ONLINE
Check upstream components for obstruction,
e.g.:
· fluidic lines
· valves
· filters
Check process outlet and downstream piping
for obstruction
Contact Mass Flow ONLINE
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