BLX v100 positioner, Installation, Operating And Maintenance Instructions, Page: 5 / 32

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1.4 Air quality recommendations
Poor air quality is one of the causes of premature
functional problems with pneumatic and electro-
pneumatic equipment. The pilot valve and I/P-
converter are precision instruments and are there-
fore the most sensitive parts of the positioner.
a) Water in the supply air is a natural occurrence.
This happens when air is compressed. The com-
pression heats the air and the natural degree of
water in the air can remain as moisture.
When the air cools in pipes etc. the moisture
condenses and becomes liquid water.
Large quantities can build and sometimes flood
small water separators. This excess water will
eventually reach the control valve and positioner.
This can cause corrosion damage to the I/P con-
verter, causing the unit to malfunction.
We strongly recommend the use of water separat-
ors with adequate capacity. Coalesing filters from a
reputable manufacturer is an inexpensive way to
help prevent unit malfunctions or failures and add
life to the product. These filters remove particles
and moisture from air lines.
1.3 Product identification
The V100 has two identification tags, the serial
number tag(1), and the product model tag(2).
The latter contains information on control
signal, maximum working pressure and temp-
erature ranges.
Other information can be shown depending on
the model.
b) Oil in the supply air usually is from the main com-
pressor. Oil can clog the small nozzles and disturb
the flapper in the I/P-converter. It can also cause the
spool to “drag” within the pilot valve.
The result is poor control or in the worst case, failure.
c) Particles in the air usually occur because of corros-
ion. Dirt and particles can block the small nozzles of
the I/P-converter. They can also cause the pilot valve
to malfunction. The unit may completely fail.
To ensure normal operational safety with BLX posit-
ioner products, we recommend that a water separator
and a <80 micrometer filter are mounted as close to
the product as possible.
If larger amount of oil is present an oil separator
should be installed as well.
To further increase operational safety, we recommend
that the working air is clean, dry and free of moisture,
water, oil, particles and other contaminants, in accord-
ance with the international standard ISA S7.3-81.
The serial number tag The product model
tag for V100P
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V100 Positioner