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blown free of particles and metal shavings after manufacturing and
before the flowmeters are installed. We strongly recommend an
upstream filter with an efficiency of at least 99.9%. Do not use an oil-
impregnated filter. Consult factory for more information.
Inlet / Outlet Screens
The small screens on the inlet and outlet of the flowmeter trap dirt
and manufacturing debris. They are not a substitute for providing
clean, filtered gas. Do not operate the flowmeter without these
screens in place since the flowmeter was calibrated with them in
place.
These screens should be viewed as a “second” line of defense
against contamination. The “first” line of defense is designing the
system so that only clean gas goes to the flowmeter. Be especially
careful of assembly procedures that could introduce dirt, oil, filings,
fibers, sealants, etc., into the flow path.
There is no practical way for an end-user to clean the screens, since
it requires complete disassembly and recalibration. The instruments
must be returned to the factory for this service.
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