Emerson i2P-100 - Relay Maintenance

i2P-100 Transducer
Instruction Manual
Form 5777
September 2004
12
VALVE PLUG
(KEY 39)
ONE OF THREE
TABS ON VALVE PLUG
END OF SPRING COIL
BODY PLUG
(KEY 32)
O-RING
(KEY 42)
INNER VALVE
SPRING
(KEY 35)
A6057-1/IL
Figure 12. Valve Plug, Inner Valve Spring and
Body Plug Assembly
3. Remove the three screws (key 26) and remove
the electronics module from the housing.
Replacement
1. Insert the electronics module into position in the
housing (key 1). Replace the three screws (key 26)
and tighten them.
2. Replace the electrical wiring removed in step 1 of
the removal procedures. Do not overtighten the
terminal screws. Maximum torque is 0.45 NSm (4
lbfSin).
3. Electrically calibrate the unit using the procedure
in the Calibration section of this manual.
4. Replace the housing cap (key 2), making sure to
re-tighten the set screw (key 8).
Relay Maintenance
Refer to figures 12 and 14 for key number locations.
Removal
1. Remove the four mounting screws (key 36,
shown in figure 14) and remove the relay from the
transducer. Be careful not to lose the bias spring
(key 34) and input diaphragm (key 38).
2. Remove the body plug (key 32) that holds the
inner valve spring (key 35) and valve plug (key 39) in
place from the relay body assembly.
3. Remove the exhaust port assembly (key 33) from
the relay assembly.
4. Inspect the springs, exhaust seat, valve plug, and
other parts for wear or damage; replace as
necessary. Note: the valve plug supply seat is an
insert in the relay body (key 41). If this insert is bad,
replace the relay body.
5. Make sure all parts of the relay are clean and that
all passages are clear of foreign matter.
Assembly
1. Assemble the inner valve spring (key 35) onto the
body plug (key 32) and fit the valve plug (key 39)
onto the inner valve spring as shown in figure 12. To
assure best alignment between the valve plug, inner
valve spring, and body plug; fit the valve plug onto
the inner valve spring so that one of the three tabs at
the base of the valve plug sets at the end of the last
coil of the inner valve spring.
2. Lubricate the O-ring (key 42) with Dow Corning III
(key 37). Insert the assembled valve plug, inner
valve spring, and body plug into the relay body (key
41). Compress the spring and thread the body plug
(key 5) into place. Then, tighten the body plug.
3. Insert two of the mounting screws (key 36) into
two opposite holes of the relay body (key 41). Hold
the screws in place while assembling the following
parts on the relay body. The screws serve as studs
to align the parts as they are being assembled.
4. When replacing the exhaust port assembly
(key 33), make sure all passages and screw holes
are aligned and that the hole in the center of the
exhaust port assembly fits over the valve plug
(key 39). Place the exhaust port assembly on the
relay body (key 41). Hold assembled parts in place.
5. Make sure the tabs on the body block (key 40)
align with the tabs on the relay body (key 41) and
that the side with 5 holes faces the relay body. Place
the body block on the assembled parts. Hold
assembled parts in place.