3660 and 3661 Positioners
Instruction Manual
Form 5265
March 2006
25
make adjustments as described in the Calibration
section.
WARNING
Avoid personal injury or property
damage from sudden release of
process fluid. Before performing any
Maintenance procedures:
D
Always wear protective clothing,
gloves, and eyewear to avoid personal
injury.
D
Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
D
Use bypass valves or completely
shut off the process to isolate the
valve from process pressure. Relieve
process pressure on both sides of the
valve.
D
Vent the power actuator loading
pressure and relieve any actuator
spring precompression.
D
Use lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
D
For 3661 positioners in
intrinsically safe areas, current
monitoring during operation must be
with an approved meter for hazardous
areas in order to avoid personal injury
or property damage caused by an
explosion or fire.
D
Check with your process or safety
engineer for any additional measures
that must be taken to prevent against
process media.
Changing the Positioner Action
This section explains changing the positioner action
from direct to reverse or reverse to direct. With direct
action, the positioner output pressure increases as
the instrument input signal to the positioner
increases. With reverse action, the positioner output
pressure decreases as the input signal to the
positioner increases. To change the action of a
positioner that is already mounted on an actuator,
remove the positioner from the actuator. Refer to the
Removing the Positioner from Actuator section.
Refer to figure 24 or 25 for key number locations.
1. Unscrew the two captive cover screws and
remove the cover (key 21). Carefully lift the flapper
spring at the location shown by key 10.
2. Slide out the flapper (key 9) and rotate it so that
the desired letter (D or R for direct and reverse) is
nearest the adjusting screw (key 18). When inserting
the flapper, be sure the end of the flapper engages
the groove in the end of the screw and that the
flapper spring (key 10) sets into the V-notches of the
flapper.
3. Mount the positioner to the opposite actuator leg
as explained in the Positioner Mounting section and
4. Refer to the Calibration section of this manual for
the calibration procedure.
Changing the Range Spring
Refer to figure 24 or 25 for key number locations.
1. Unscrew the two captive cover screws and
remove the cover (key 21). Loosen the retaining
screw (key 19P) and pull the feedback lever
assembly (key 19) out slightly to release the range
spring (key 30) tension.
2. Remove and replace the range spring (key 30).
3. Push the feedback lever assembly (key 19) back
into position and retighten the retaining screw
(key 19P).
4. Refer to the Calibration section for the calibration
procedure.
Changing the Input Signal Range on
Type 3660 Positioners
To change the input signal range from 0.2 to 1.0 bar
(3 to 15 psig) to 0.4 to 2.0 bar (6 to 30 psig) or vice
versa, change the input diaphragm assembly (key
28, figure 24) by performing the Changing the Input
Module Diaphragm Assembly procedure in this
Maintenance section.
