4660 Pressure Pilot
Instruction Manual
Form 5200
September 2004
7
Figure 3. Cutout Dimensions for Panel Mounting
REAR REMOVAL
FRONT REMOVAL
mm
(INCH)
18A3804-F
A3299-1 / IL
Figure 4. Location of Pressure Connections
18A3804-G/DOC
Supply pressure must be clean, dry air or
non-corrosive gas that meets the requirements of
ISA Standard S7.3. Use a suitable filter regulator,
such as the Type 67CFR regulator to remove solid
particles and to maintain the supply pressure source
within the normal operating range of 1.4 to 2.4 bar
(20 to 35 psig). Refer to table 1 for the pilot supply
flow requirement (relay construction only). As shown
in figure 4, connect supply pressure to the
connection marked SUPPLY on the bottom of the
pilot case.
Process Pressure
Connect process pressure to the connection marked
PROCESS on the bottom of the pilot case as shown
in figure 4. When installing process pressure piping,
follow accepted practices to ensure accurate
transmission of the process pressure to the pilot.
Install shutoff valves, vents, drains, or seal systems
as needed in the process pressure line. Install a
needle valve in the process pressure line to dampen
pulsations.
Output Pressure
Connect output pressure piping to the connection
marked OUTPUT on the bottom of the pilot case as
shown in figure 4. Refer to the appropriate control
valve or actuator instruction manual to complete the
connection of output pressure piping from the pilot to
the loading connection of the control valve actuator.
Vent
WARNING
Where flammable, or hazardous gas is
used as the supply pressure medium,
personal injury or property damage
could result from ignition or explosion
of accumulated gas or from contact
with hazardous gas. Because the
instrument case and cover assembly
do not form a gas-tight seal when the
assembly is enclosed, a remote vent
line, adequate ventilation, and
necessary safety measures should be
used to prevent the accumulation or
flammable or hazardous gas. Vent line
piping should comply with local and
regional codes, should have adequate
inside diameter, and should be be as
short as possible to reduce case
pressure buildup. However, a remote
vent pipe alone cannot be relied upon
