BRONKHORST ES-FLOW, Инструкция по эксплуатации

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Bronkhorst®
Instruction Manual ES-FLOW™ 9.17.116B 45
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.
Energizing and de-energizing the instrument can indicate if there is an electronic failure. After energizing, control behavior
can be checked by applying fluid pressure.
If you suspect leakage, do not disassemble the instrument for inspection, but contact your local distributor for service or
repairs.
5.1 Common issues
Symptom Possible cause Action
Red LED glows continuously, while
display shows irregular measure
readout
No liquid in measuring tube Fill fluidic lines with process liquid before
starting measurement and control (see First
use )
Inlet pressure unstable (flow rate
pulsating)
Eliminate pressure fluctuations, e.g. by
installing a pressure regulator
Red LED glows continuously,
display shows no flow
Hardware error Return equipment to factory
No (fieldbus) communication No power supply
·
Check power supply
·
Check cable connection
·
Check cable hook-up
Invalid node address Change node address (see Network
configuration )
Other Reset instrument and/or restart master. If
problem persists, contact Bronkhorst.
No output signal No power supply
·
Check power supply
·
Check cable connection
·
Check cable hook-up
Sensor failure Return equipment to factory
·
Control behavior unstable
·
Red LED flickers or flashes
irregularly
Inlet pressure unstable (flow rate
pulsating)
Eliminate pressure fluctuations, e.g. by
installing a pressure regulator
Gas accumulation in tubing Flush the system to remove gas
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.:
·
fluidic lines
·
valves
·
filters
Inlet pressure or differential
pressure out of bounds
Set inlet pressure to a value within
specifications
Flow rate or pressure 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