Michell Instruments Condumax II Installation Operation & Maintenance page 24

MAINTENANCE
Membrane Replacement
The membrane is held in place by the O-ring.The whole membrane holder unit comes
free from the housing leaving the filter housing /body still intact with the process lines
with no need to loosen connections. The membrane can then be replaced on a work
bench using a round nose pair of tweezers - the old O-ring is removed with the old
membrane. The sintered disc should be removed and cleaned or replaced. Drag a new
membrane over the sintered disc carefully as not to cause damage, until centralized
over the sintered disc and O-ring groove. Place the new O-ring over/around the new
membrane and gently push into the O-ring groove. Replace the coalescing filter element
where applicable with a new element and screw/locate the whole membrane holder
back into the filter housing/body. The inlet is stamped no.1 and the outlet is stamped
no.2, the other two ports are drain ports. Both can be used or one drain may be blanked
off with a plug.
Service Intervals
A disposable microfiber filter element continues to filter at its original efficiency as long
as it is kept in service. The life of the element is determined by the increase in flow
resistance caused by trapped solids in the element. The element should be changed
when the flow falls below an acceptable level, or the pressure drop becomes too high.
In any case the element should be replaced before the pressure drop across it reaches
0.7 bar. The disposable microfiber filter elements cannot be cleaned as the solids are
trapped within the depth of the element, not on the surface.
Ensure that gaskets are changed at suitable intervals. The interval time will depend on
service and operating conditions, but it should be at least every three months.
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Condumax II Sampling System -
NEC Compatible IOM Manual
97525, Issue 1, November