15
Routine Maintenance
Maintenance
High Purity Nitrogen Generator
UM – NM20ZA – Rev 13
WARNING
Servicing and/or repair of the Generator should only be undertaken by a TECHNICALLY
COMPETENT PERSON, with the generator in its safely isolated condition.
SAFELY ISOLATED CONDITION
Definition: The unit is in a Safely Isolated Condition when it is disconnected from its application, fully
de-pressurised and isolated from the Electrical Supply. Directions for isolating the generator are shown
below.
Isolating the Generator:
a) Switch off the unit.
b) Unplug the generator from the mains supply and remove the power cord from the rear of the unit.
c) Ensure the pressure gauges on the front panel reads zero. (If gauge does not fall to zero, loosen
outlet fittings slightly to allow trapped gas to escape.)
d) Disconnect from the application.
e) Important Note: Allow 10 minutes for unit to fully de-pressurise. After this time pull out the
‘Quick Release Ring’ on the Pressure Relief valve situated on the tank. Ensure tank is fully
depressurised before releasing the ring.
Parts Replacement Period
Compressor Inlet Filters Every 6 months
Filter Separator Elements Every 12- months
Compressor units (the lesser of)* Every 6000hrs or 18-months
*Compressors can be re-fitted as an alternative to replacement up to a maximum of 3 times, this is a more
cost effective solution, however a degree of technical expertise is required and can be time consuming.
Maintenance Schedule
With the generator installed as described previously, disconnect the Curtain, Source and Exhaust gas
outputs (ENSURING THAT ANY INTERNAL PRESSURE HAS BEEN SAFELY DISSIPATED), and switch
the generator on. The on/off switch should illuminate and the cooling fans should start immediately. There
will be a 10 second delay before the first compressor starts, then after a further 3 seconds the second
compressor should also start. The three pressure gauges on the front panel will begin to climb, and after
approx 3 minutes the gauges should all have reached their rated pressure of either 60 or 100 PSI.G. The
output flows from the generator should now be measured to ensure they conform to the specification below.
The generator should now be left to run for approx. 1 hour to allow the generator to fully flush the internal
receivers etc of air and allow the membranes to stabilize. After this time the Curtain, Source and Exhaust
outputs can be re-connected and the interconnecting pipe work checked carefully for leakage.
Outlet Output flow Output pressure
CURTAIN 5 Litres per min (APT) 60psi
SOURCE 22 Litres per min (APT) 100psi
EXHAUST 8 Litres per min (APT) 60psi
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