Bronkhorst®
Instruction Manual EL-PRESS™
9.17.101I
42
Symptom
Possible cause
Action
·
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
Sensor failure
Return equipment to factory
Control behavior unstable
Measurement disturbed by
vibrations
If possible, avoid installation in close proximity
of mechanical vibration
Inlet pressure unstable
Eliminate pressure fluctuations, e.g. by
installing a pressure regulator
Measured value rises, but never
reaches setpoint
Piping, filters and/or control valve
clogged or blocked
Flush fluid system with clean, dry air. If problem
persists, contact Bronkhorst.
Inlet pressure too low
Increase inlet pressure
System leakage
Check system for leaks
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, filters and/or control valve
clogged or blocked
Flush fluid system with clean, dry air. If problem
persists, contact Bronkhorst.
Continuous maximum measured
value or output signal
Inlet pressure too high
Check inlet pressure
Sensor failure
Return equipment to factory
Control valves oscillate during
operation (P-800 series)
Controller Hysteresis
too low
Increase
Controller Hysteresis
value (see