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3610J and 3620J Positioners
CAUTION
To avoid damage to the nozzle during
the next step, be careful not to apply
force to the exposed nozzle primary
orifice. Excess force may loosen or
crack the orifice.
3. Remove the nozzle (key 116) from the nozzle
block (key 146) by carefully pushing on the nozzle
tip with the thumb or other soft object until the base
of the nozzle begins to protrude from the back of the
nozzle block. Grasp the base 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.
34
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).
Instruction Manual
June 2008
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