Replacing The 3661 Converter Module; Parts Ordering - Fisher 3660 Instruction Manual

Instruction Manual
D101402X012
8. Install the three O‐rings (key 49) into the body assembly (key 41) and then carefully attach the body assembly to the
positioner using the two cheese head screws (key 47).
9. Turn the bypass lever (key 42) to the appropriate POSITIONER or BYPASS position, and secure with the plastic wire
tie (key 79).
10. Reconnect the supply, instrument and output tubing, and turn on pressure to the positioner.

Replacing the 3661 Converter Module

Refer to figure 25 for key number locations. After replacing the converter module, re‐calibrate the positioner.
1. Remove the cover and disconnect the input signal wires from the terminal strip.
2. Loosen the two captive screws securing the converter to the positioner housing, and lift out the converter module
(key 100).
3. When replacing the converter module, the restrictor assembly (key 35) also should be replaced. Before the
restrictor assembly can be removed, remove the positioner from the actuator. Refer to the Removing the Positioner
from the Actuator section.
4. Remove and replace the restrictor assembly (key 35). This assembly is marked with the letters EP on the removal
screw. For location purposes, the same letters appear on the back of the positioner case.
5. To mount the positioner on the actuator, refer to the Positioner Mounting section.
6. Install a new converter, and secure to the housing with the two captive screws. Reconnect the input signal wires.
7. Refer to the Calibration section for the calibration procedure.

Parts Ordering

When corresponding with your
positioner type number.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should
not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson Process
Management may void your warranty, might adversely affect the performance of the instrument, and could result in
personal injury or property damage.
Emerson Process Management sales office
3660 and 3661 Positioners
about this equipment, always mention the
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