NM20ZA Service Manual Rev 14
NM20ZA
Service Manual – Revision 13
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Principal of Operation.
Peak Scientific Instruments NM20ZA Generators utilize two different types of air preparation membranes
to produce the required Gas outputs. The Nitrogen side of the generator employs “
Hollow Fibre
Membrane”
Technology to efficiently separate Nitrogen from other gases present in ambient air. An
overview of this process can be seen below.
The Zero Air side of the generator uses the latest technology in membrane dryers to produce a clean dry
supply of Zero grade air. Both membranes are mounted in a similar fashion in the generator and utilize
standard ancillary components to maximize the interchangeability of the systems. The standard
membrane diagram can be seen below.
Membrane - Standard Diagram
1.
11.
3.
2.
4.
5.
10.
6.
7.
8.
9.
Air is drawn into the system by the Compressor (1) and passed through the Cooling Coil (2) and the
AFD – 3000 Micro Mist Filter (3) into the Membrane (5). After the Membrane (5) the gas is passed
through a Reverse Acting Carbon Filter (6) to remove any remaining impurities and via the Non-Return
Valve (Check Valve) (7) into the Receiver (10). The stored gas is regulated (11) to give the required
output pressure and flow. Receiver pressure is measured (9) to allow the generator to un-load (4) and
shut-down should demand cease. A Safety Relief Valve (8) is fitted to protect the system against over
pressure. Gas is delivered out of the machine via the Outlet Port (12). Any moisture collected by the
AFD – 3000 Micro Mist Filter (3) is expelled via the Drain Port (13).
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