FP302 - Operation, Maintenance and Instructions Manual
1.2
Pneumatic Connections
The instrumentation air must be of better quality than industrial compressed air. Humidity,
suspended particles and oil can temporarily harm the device performance or definitely, if the internal
parts can be damaged.
In compliance with the
ANSI/ISA S7.0.01 - 1996 - Quality Standard for Instrument Air
standard, the
instrumentation air must bear the following characteristics:
Dew Point
10º C
below the minimum registered temperature.
Size of particles
40 µm (maximum).
Oil content
1 ppm w/w (maximum).
Contaminants
Must be free from corrosive or inflammable gases.
The standard recommends that the compressor inlet is in a place free from process spills and uses
the adequate filter. Also, that non-lubricated compressors are used to prevent contamination from
lubricant oil. When lubricated compressors are used, there must be means to clean the
contaminated air.
It is recommended the periodical filter cleaning, and more frequent ones in case of bad
instrumentation air quality.
For an
output signal from 3 psi (0,2 bar) to 15 psi (1 bar)
, it is required a minimum air supply of
18 psi (1.24 bar) and a maximum 100 psi (7 bar) supply.
For an
output signal from 3 psi (0,2 bar) to 30 psi (2 bar)
, it is required a minimum air supply of
40 psi (1.4 bar) and a maximum 100 psi (7 bar) supply.
NOTE
To get a maximum output pressure value, the converter requires the minimum necessary pressure described
above
An excessive pressure supply, above 100 psi, may be harmful.
The air pressure supply for the FP302 must be a minimum of 18 psi and a maximum of 100 psi. If
this condition cannot be met, an air pressure regulator is recommended.
The air supply inlet is marked with “IN” and the outlet with “OUT” (See figure 1.3 - Converter
Dimensional Drawing and Mounting Position)
The air supply inlet and outlet connections are ¼ “ NPT threaded. Before connecting the piping,
purge the lines completely. There must be no leaks, mainly on the outlet. Check all piping parts and
connection for leaks. Use good sealing practices before operating the equipment. Thread sealants
are recommended instead of PTFE (Teflon) sealant tape.
The vent is used to exhaust the air to relieve the output pressure. This vent must never be
obstructed for better air flow.
In case of loss of pressure supply, the output will drop near 0 Kgf/cm³ (0 psi). If the pressure is kept,
but communication is lost, the output may be pre-configured for a free value or a safe value.
Summary of Contents for FP302
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