Azbil SVX100, Руководство пользователя

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13
Connecting the Air Supply
Clean and dry supply air ensures long-term stability of the SVX.
Instrumentation equipment air
Since this flowmeter employs a flapper nozzle mechanism in the electro-pneumatic
converter, if the instrumentation equipment air is contaminated or contains oil or moisture,
its functioning as a positioner could be disabled or it could cause an unrecoverable failure.
Therefore, the quality of the instrumentation equipment air to be supplied to this flowmeter is
defined as follows:
„
Solid body: there must be no particles whose diameter is over 3 μm.
„
Oil: It must be less than 1 ppm in mass.
„
Humidity of the supplied air: The dew point temperature must be at least 10 degrees
Celsius lower than the temperature of the equipment body.
Taken from JIS C1805-1 (2006)
Follow the specifications described above to select a compressor and a main-line type or end-
installation type compressed air cleaner.
(1) Compressed air cleaner for main lines
Select a main line filter and a compressed air cleaner for main lines such as the micro-
alescer produced by SMC Corporation or CKD Corporation, which are famous as
compressed air cleaner makers, to satisfy the above-mentioned specifications.
(2) End-installation type compressed air cleaner
If fundamental measures for main lines cannot be taken because of any problem related
to, for example, the control valve installation, install an end-installation type compressed
air cleaner (oil mist removal equipment) to supply instrumentation equipment air to the
flowmeter through this compressed air cleaner.
<Examples of recommended equipment>
Products produced by SMC Corporation
Mist separator
AM150, AM250 series
(filtration 0.3 μm, secondary oil mist concentration: 1.0 mg/m
3 )
Air combination
Filter reg mist separator
AW30 series (filtration rate: 5 μm) + AFM30 series (filtration rate: 0.3 μm)
Products produced by CKD Corporation