Instruction Manual
D103621X012
4320
January 2018
20
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 22.
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 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.
D
The 4320 does not incorporate explosive fluid and/or process seals. Follow appropriate local, regional, and national,
codes for installation of these types of products when using natural gas as the supply medium.
CAUTION
Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed
by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.
Supply pressure medium must be clean, dry, and noncorrosive and meet the requirements of ISA Standard 7.0.01 or
ISO 8573-1. 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 supply medium 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. 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 15 for spool valve supply
and work port 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.