Background
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The gas filters we now supply (Dentsleeve
product code FIL/GA/1) are intended specifically for Dentsleeve
manometric perfusion pumps, and are installed within our
pump control box.
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They filter the gas feed to the second
stage regulator which is also installed in the pump control
box.
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Gas filtration is needed because the
performance of the high precision second stage regulator
is impaired by relatively small particles as a result
of the very fine openings they use to control
gas flow. |
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Description/performance
data
These filters have a 0.3 micron pore size and a relatively large
filtration capacity. They are distinguished from our water filters
of the same shape by the marking GAS-0.3 um.
Their low cost allows them to be discarded when clogged.
Filters have luer lock male/female fittings which allow easy
replacement.
The second stage regulator for the perfusate driving gas (air
or nitrogen) is protected by these filters.
The filters are reached by removing the lid of the pump control
box, which is readily removed by unscrewing the screws on the
side of the box.
To replace a filter, disconnect the spent filter at the luer
lock connectors. The Dentsleeve
0.3 micron gas filter should not be confused with the 20 micron
water filter, which has the same shape. The gas filter is marked
with "GAS". Double check that you are using the correct
filter.
Ensure that the luer connectors are mated firmly to give a gas-tight
connection. |
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Recognition
of need for filter replacement
The service life of the filters depends
on the quality of the gas supply.
Filters should be replaced when they are restricting gas flow
to a level that impairs pump performance.
Restriction of gas flow by a clogged filter is evident as a
major sustained drop of the final supply pressure on the control
box pressure gauges during high levels of manifold water or
gas outflow, in the face of an adequate supply of gas to the
filter.
Limitations
Filtration capacity needs to be conserved
by the use of a high quality gas supply.
If the service life of the filter is unacceptable short, this
indicates that the gas supply contains an unacceptable level
of particles.
Dentsleeve
can advise on suitable additional gas filtration measures, if
necessary. |
