INFICON Crystal 12 Sensor - Manual (Page 50)

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Crystal12 Sensor Operating Manual
4.3.3 Replacing the Bellows Assembly (750-286-P2)
Replace the bellows assembly with INFICON part number 750-286-P2. This will
require the removal of the used bellows assembly and reattachment of the
replacement bellows assembly to the feedthrough airline (refer to
section 1.1.1,
Installation Requirements, on page 1-2 ).
4.3.3.1 Equipment required:
Š 1/16" Allen wrench (Included in 750-268 kit)
Š 3/32" Allen wrench (Included in 750-268 kit)
4.3.3.2 Procedure
1 Remove the two #4 fasteners (item 7, Figure 1-6 on page 1-9 ) that secure the
actuator cover (item 22, Figure 1-6 on page 1-9 ) to carousel housing weldment
(item 14, Figure 1-5 on page 1-8 ).
2 Remove the actuator cover. Remove the front deposition shield (item 17,
Figure 1-5 on page 1-8 ) by unthreading the two knurled captive screws.
3 Remove the extension spring (item 27, Figure 1-4 on page 1-7 ) from the pawl
and actuator stem assembly (item 18, Figure 1-4 on page 1-7 ).
4 Remove the two #4 fasteners (item 9, Figure 1-4 on page 1-7 ) that secure the
bellows assembly (item 37, Figure 1-5 on page 1-8 ) to the carousel housing
weldment (item 14, Figure 1-5 on page 1-8 ).
5 Carefully remove the bellows assembly. The pawl and actuator stem assembly
(item 18,
Figure 1-4 on page 1-7 ) and the detent (item 25, Figure 1-5 on page
1-8 ) will be removed with the bellows assembly.
6 Unthread the Pawl and Actuator stem assembly (item 18, Figure 1-4 on page
1-7 ) from the bore of the Bellows assembly being replaced (item 37, Figure 1-5
on page 1-8 ) and install it into the replacement Bellows Assembly. Continue to
thread the Pawl and Actuator assembly until the shoulder of the Actuator stem
is approximately 0.034" away from the bellows assembly. This distance
specification is for reference only — the actuator stem position may need to be
adjusted to obtain the desired condition as illustrated in
Figure 1-4 on page 1-7 .
7 Remove the Detent and related hardware (items 1, 3, 5, 26, Figure 1-5 on page
1-8 ) from the bellows assembly and attach them to the replacement bellows
assembly. Do not tighten the fastener. Discard the used Bellows Assembly.
8 Using the 1/16" allen wrench, loosen the set screws (item 12, Figure 1-4 on
page 1-7 ) that secure the ratchet (item 29, Figure 1-5 on page 1-8 ) and the stop
ratchet (item 31, Figure 1-5 on page 1-8 ) to the carousel spindle body (item 24,
Figure 1-5 on page 1-8 ).