|
Item |
PROBLEM |
DIAGNOSIS |
SOLUTIO |
|
1 |
High Oxygen Content in the Nitrogen Product |
Membranes are unable to remove sufficient oxygen at the give feed.
Operating pressure is below design.
Membrane Temperature too low.
Oxygen analyzer is out of calibration.
|
Throttle down the system output by purity valves until the oxygen content is reduced to an acceptable level. Please be patient!
Readjust back pressure regulator and purity control valve. Check compressor discharge capacity.
Wait for membrane to warm-up to operating temperature (40-45℃).
Recalibrate oxygen analyzer (see Start-up and Shutdown procedures or User Interface for calibration procedure). Make sure to calibrate to about 20.9% when sampling air.
|
|
2 |
Low nitrogen Product output |
Throttle valve closed too far.
Inlet feed pressure too low.
Restriction in feed air supply.
System pressure set too low.
|
Open valve to increase product output. Oxygen content will increase as flow rate is increased. Please be patient!
Nitrogen purity must be readjusted.
|
|
3 |
Low feed gas temperature to membrane. |
Heater Contactor failed in open position.
Heater element failure.
PLC temperature controller failure.
Thermocouple failure, if error message appears on temperature controller display.
|
Replace heater contactor.
Check electrical connections to PLC and temperature controller.
Replace thermocouple.
|
|
4 |
Inability to maintain pressure in system |
Air Leak in system.
Compressor capacity is less than the air feed required by the membrane system.
Lower N2 use flow over the output of the system.
|
Leak test piping and fittings and repair.
Reduce the rate of nitrogen production by partially closing Purity Control Valve. Check compressor discharge flow capacity.
Add new membrane.
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