Peak Scientific MS Bench SCI 1, Руководство по обслуживанию

Страница: 8 / 36

Page 8
Principle of Operation
On Demand Gas
When the application requires a gas flow, the generator produces gas on demand.
The generator will continue to supply the gas demand, whilst the application is in a
'Standby' mode the generator will still produce a low flow of gas. As soon as a demand
is detected from the application, the generator will again match the applications
requirements.
System Description
The generator consists of two compressors; the combined compressed air output
provides the requirements for both nitrogen and air demands; the compressed air is
stored in a reservoir prior to being divided to produce the nitrogen and air gases.
To produce nitrogen (CURTAIN) gas, a division of air is passed through the membrane
(see below for membrane process). The nitrogen is then stored in a dedicated reservoir
until needed. The air division is split once more between the desired outputs - ‘SOURCE’
and ‘EXHAUST’. Finally, all output product is passed through an RAC filter prior to
delivery to the application.
Once the designated upper reservoir setting has been achieved, the compressors will
switch OFF until the lower pressure setting is reached. At this point the compressors will
switch back ON and begin the cycle once again; this is referred to as the ‘Pressure Cycle’.
The generator output flow is completely controlled by the demand of the customer’s
application; the generator will produce up-to the maximum stated and will not exceed
this.
The membranes utilize separation technology to create Nitrogen. The membrane consists
of a bundle of hollow fibers, when compressed air is passed through the fibers the
oxygen in the air permeates through the walls of the fiber giving a high purity Nitrogen
output. The air drier membrane works in a similar manner, where the moisture in the air
permeates through the wall of the fibre to give a Dry Air output.