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Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Pneumatic Hookup Procedures for On/Off Control Option

WARNING

To avoid personal injury or property damage resulting from bursting of parts, do not exceed maximum supply pressure.

Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and

appropriate preventive measures are not taken. Preventive measures may include, but are not limited to, one or more of

the following: Remote venting of the unit, re‐evaluating the hazardous area classification, ensuring adequate ventilation,

and the removal of any ignition sources. For information on remote venting of this controller, refer to page 26.

Severe personal injury or property damage may occur from an uncontrolled process if the instrument supply medium is not

clean, dry, oil‐free, and noncorrosive. While use and regular maintenance of a filter that removes particles larger than 40

micrometers in diameter will suffice in most applications, check with an Emerson Process Management field office and

industry instrument air quality standards for use with corrosive air or if you are unsure about the amount of air filtration or

filter maintenance.

WARNING

When using natural gas as the supply medium the following also applies:

D When disconnecting any of the pneumatic connections or any pressure retaining part, natural gas will seep from the

unit and any connected equipment into the surrounding atmosphere. Personal injury or property damage may result if

natural gas is used as the supply medium and appropriate preventive measures are not taken. Preventive measures

may include, but are not limited to, one or more of the following: ensuring adequate ventilation and the removal of any

ignition sources.

Supply pressure must be clean, dry, air that meets the requirements of ISA Standard 7.0.01.

Alternatively, natural gas must be clean, dry, oil-free, and noncorrosive. H

S content should not exceed 20 ppm.

A maximum 40 micrometer particle size in the air system is acceptable. Further filtration down to 5 micrometer

particle size is recommended. Lubricant content is not to exceed 1 ppm weight (w/w) or volume (v/v) basis.

Condensation in the air supply should be minimized.

Use of a 67CFR filter regulator with standard 5 micrometer filter, or equivalent, to filter and regulate supply air should

suffice in most applications. The 67CFR filter regulator can be integrally mounted with the position monitor. Supply

connections are 1/4 NPT.

Prior to connecting the supply air to the spool valve, flush the system to remove any debris or contaminates.

4-Way Spool Valves

The spool valve is a 5 port, 4-way valve driven by an internally mounted pilot. Refer to figure 18 for spool valve supply

port and work ports locations and installation options.

CAUTION

Failure to install the supplied vents in the exhaust ports (ports 3 and 5) can result in damage to the seals.

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Emerson Fisher 4320 Bedienerhandbuch Seite 24