4660 Pressure Pilot
Instruction Manual
Form 5200
September 2004
8
to remove all flammable and
hazardous gas.
If a remote vent is required, use 19 mm (0.75 inch)
(minimum inside diameter) pipe for runs up to 6.09
meters (20 feet). For vent piping runs from 6.09 to
30.5 meters (20 to 100 feet), use 25.4 mm (1-inch)
(minimum inside diameter) pipe. Remove the vent
screen (key 20, figure 8) and install a remote vent
pipe to exhaust the vented gas to a safe,
well-ventilated area. The vent, as shown in figure 8,
or the end of a remote vent pipe must be protected
against the entrance of all foreign matter that could
block the vent. Check the vent periodically to be
certain it is not plugged.
Operating Information
For high-only and low-only constructions, perform
the procedures that are outlined in the adjustments
portion of this section. For high-only constructions,
perform only those procedures that pertain to setting
and checking the high set point. For low-only
constructions, perform only those procedures that
pertain to setting and checking the low set point. For
high-low constructions, perform procedures that
pertain to both the high and low set points.
WARNING
Avoid personal injury or property
damage from an uncontrolled process
or sudden release of process
pressure. Before starting any
adjustments:
D
Provide some temporary means
of process control before taking the
pilot out of service.
D
Shut off the process pressure line
and the supply pressure line, and
bleed all the supply pressure.
D
Bleed all process pressure from
the pilot so that no pressure is
contained in the Bourdon tube.
D
Use lock-out procedures to be
sure that the above measures stay in
effect while you are working on the
equipment.
D
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
Pilots Without Optional Set Point
Indication
Preliminary Adjustments
Make sure each of the following six steps have been
performed completely before setting either the high
or low set point pressures. Key numbers are shown
in figure 8.
1. Refer to the warning at the beginning of the
Operating Information section. Make sure the
Bourdon tube contains no pressure.
2. Install either a pressure gauge or an optional
output indicator in the output pressure line.
3. Remove the cover screws and the cover (keys 6
and 4).
4. Unlock each locking disk (key 69) that holds each
set point knob in place. Turn the HIGH SET knob
clockwise until it has reached the end of its travel.
Turn the LOW SET knob (key 67) counterclockwise
until it has reached the end of its travel.
5. Turn on the supply pressure. To check that the
supply pressure is turned on, push the SUPPLY
TEST button located in the cleanout assembly (key
54) on the front plate (key 74) until a flow sound is
heard.
WARNING
To avoid personal injury or property
damage caused by a sudden release of
pressure, do not exceed the process
pressure values in table 4.
6. Connect an external pressure source to the
process pressure connection. This external pressure
source should be a regulated air or gas supply that
is adjustable to zero. The external pressure source
must be capable of supplying a process pressure
that will be equal to or greater than the desired high
set point pressure.
7. Continue with the appropriate procedures
described below. Replace the cover and cover
screws after all adjustments are completed.
