Nitrogen gas generators can be used for the supply of nitrogen
to glove boxes and desiccators. However consideration must be given
to the operating parameters of the equipment and the desirable results
required in selecting this form of gas supply over traditional bottled,
or boil-off nitrogen supplies.
Nitrogen generators rely on membrane separation of the constituent
parts of air including moisture. Nitrogen emerges between 95 and
99% pure with an "at best" quoted "up to 99.99% pure".
For general laboratory use, including desiccators, this gas quality
may well exceed or be within acceptable parameters, but for glove
box use these percentages should be looked at more closely.
95% purity equates to 50,000 parts per million oxygen, and even
99% is 10,000 parts per million. As for the at best at 99.99% this
is 100 parts per million (ppm).
Bottled or boil-off nitrogen is typically 3 ppm and will provide
an excellent supply quality for both open loop (gas purged) or closed
loop (recirculated) glove boxes.
Where a Nitrogen gas generator is used, a gas-purged glove box
will only provide an environment at best, somewhere below the system
feed gas quality. For recirculated glove boxes the gas feed will
have to be fed directly into the gas purifier for an improved performance,
and to avoid substantially degrading the contained environment each
time the glove box is in demand of gas. The higher levels of oxygen
will saturate the gas purifier more frequently.
Nitrogen gas generators fare somewhat better at moisture removal
providing averagely a -60 to -65ºC dew point reading equating
to between 5 and 10 ppm.
With the above reservations, Glove Box Technology Ltd can design
and supply nitrogen generator systems where the parameters are within
specification. Benefits include greater convenience and security
of gas supply at a lower unit cost.
For a quotation or budget price go to Request
for Quotation and provide as much information as possible. Our
design engineers will make contact to jointly compile an outline