Disassembling The Input Module; Positioner Reassembly; Assembling The Input Module - Emerson Fisher 3610J Instruction Manual

Instruction Manual
D200149X012
of the nozzle and pull the nozzle from the nozzle block. Inspect the O‐rings (keys 120 and 121) and replace them if
necessary. Apply lubricant (key 153) to the O‐rings before replacement.
4. Remove the core and wire assembly (key 147) from the nozzle block (key 146) by unscrewing the core from the
nozzle block.

Disassembling the Input Module

During the following input module disassembly procedures, refer to figure 25 for key number locations.
1. Perform steps 1 through 5 of the Disassembling the Summing Beam Assembly procedure.
2. Unscrew the remaining two input module machine screws (key 177) and remove the input diaphragm flange
(key 138).
3. Remove the following as an assembly: the lower and upper diaphragms (keys 118 and 119), the lower and upper
diaphragm plates (keys 132 and 134), the diaphragm spacer (key 133), the diaphragm connector (key 135), the
diaphragm spacer (key 137), and the sealing screw (key 136). To disassemble this sub‐assembly, unscrew the
sealing screw (key 136) from the diaphragm connector (key 135) and separate the parts. Inspect the diaphragms
and sealing screw O‐ring and replace if necessary [earlier positioners use a standard machine screw instead of a
sealing screw; replace the old standard screw with a sealing screw (key 136)].

Positioner Reassembly

Assembling the Input Module

Refer to figure 25 for key number locations while assembling the input module.
1. Orient the input module sub‐assembly parts as shown in figure 25 and tighten the sealing screw (key 136) into the
diaphragm connector (key 135).
CAUTION
Failure to use lubricant in the next step may cause damage to the sealing ribs during assembly and subsequent leakage.
2. Apply a light lubricant silicone spray to the sealing ribs on the lower and upper input diaphragms (keys 118 and
119). See figure 25 for location.
3. Place the input module sub‐assembly into the positioner case (key 115A) and align the four lower diaphragm
(key 118) screw holes with the four screw holes in the positioner case. Ensure that the hole in the lobe of the lower
diaphragm is aligned with the instrument air passageway in the positioner case.
4. Install the two input module machine screws (key 177) in the two holes not used to mount the zero spring bracket
(key 144) and tighten. These are the two shorter screws of the four which mount the input module.
5. If the nozzle assembly was previously removed, perform the Assembling the Nozzle Assembly procedure.
6. Perform the Assembling the Summing Beam Assembly procedure and then, continue with steps 7 through 9 below.
7. If the reversing plate (key 23) was previously removed, install the gasket (key 24) and reversing plate, and reversing
plate screw (key 49). When installing the gasket, make sure one of the three gasket holes is over the exhaust slot in
the positioner case (key 115A). Adjust the reversing plate so the letter R is showing and the letter D is entirely
covered. Tighten the screw (key 49).
8. Connect an air line to the positioner instrument connection and apply 2.4 bar (35 psig). Check the input module
sealing surfaces for air leaks using a soap solution or other suitable solution compatible with nitrile rubber.
9. If reverse action is required, leave the reversing plate (key 23) as it is. If direct action is required, loosen the machine
screw (key 49) and rotate the reversing plate so the letter D is showing and the letter R is entirely covered. Tighten
the screw (key 49).
3610J and 3620J Positioners
September 2017
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