Instruction Manual
D102005X012
846 Transducer
June 2017
32
Module Final Assembly
WARNING
Refer to the Maintenance WARNINGS at the beginning of this section.
The active mechanical and electrical components of the transducer are incorporated into a single, field‐replaceable
module called the module final assembly, as shown in figure 15. Electrical connection between the terminal
compartment and module final assembly is made by electrical feedthroughs that extend into the module
compartment. The feedthroughs enter sockets on the electronic circuit board. The span and zero screws extend
through the terminal compartment wall into the module compartment. Connection to the span and zero
potentiometers on the electronic circuit board is made by hook and loop fasteners.
The module final assembly has three separate radial ports. The upper port is for supply air, the middle port for the
output signal, and the lower ports for exhaust. Three O‐rings separate the ports. The two lower O‐rings are the same
size, and the upper O‐ring is slightly smaller. Table 4 shows O‐ring sizes.
The module final assembly is attached to the module cover, which allows insertion and removal, and can be separated
from the module cover for further disassembly. A module cover O‐ring provides a seal between the module cover and
module final assembly. Table 4 shows the O‐ring sizes. A slip ring is located around the module feet. It allows the
module cover to turn easily when the module final assembly is being removed from the housing.
The module final assembly consists of three major subassemblies, as shown in figure 15. They are the electronic circuit
board, pilot/actuator assembly, and module subassembly.
Table 4. O‐Ring Sizes
Description Qty. Size
Module O‐rings 1
2
043
042
Pilot/Actuator O‐rings 2 006
Circuit Board O‐rings 1
1
- - -
005
Module Cover O‐ring 1 238
Terminal Cover O‐ring 1 238
Filter‐Regulator O‐ring 1 114
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