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<11. Inspection and Maintenance>
11-7
IM 11M13A01-04E
Replacement of heater strut assembly
Refer to Figure 11.4 as an aid in the following discussion.
Remove the sensor assembly, following Subsection 11.1.2, earlier in this manual.
Remove the four bolts
10
to remove the converter
16
. Then remove the three connectors to which
lead wire from the heater and thermocouple is connected.
Loosen screw
19 until it can be removed from hole in heater strut assembly
23
plate.
O-ring
18
prevents screw 19 from dropping out. The O-ring does not loosen and remove the screw
for the heater assembly fixation
8
with a special wrench (part no. K9470BX or equivalent) and then
remove the heater strut assembly
23
from the detector
24
.
To reassemble the heater strut assembly, reverse the above procedure:
Insert the heater strut assembly
23
into the detector
24
, while inserting the calibration pipe in the
detector
24
into the heater section in the heater strut assembly
23
as well as in the bracket hole.
Coat the screw for the heater assembly fixation
8
with grease (NEVER-SEEZ: G7067ZA) and
tighten the screw for the heater assembly fixation
8
with a special wrench (part no. K9470BX or
equivalent) with a tightening torque of 12N•m ± 10%.
Next, to install the O-rings 22 on the calibration gas and reference gas pipes, disassemble the
connector
13
in the following procedure:
First, remove the screw
25
and then remove the plate
17
and two caps
20
. If the O-ring
22
remains
in the hole, pull them out from the back. Pass the heater and thermocouple lead wire through the
connector 13 . Also, pass the calibration-gas and reference-gas pipes through the opening of the
connector
13
. If the O-ring
22
fails, replace it with a new one.
Push the two caps 20 into the associated opening of the connector
13
. Insert the plate
17
, aligning it
with the groove of the cap
20
, and tighten it with the screw
25
. If you attempt to insert the calibration
gas and reference gas pipes into the connector
13
without disassembling the connector
13
, the
O-ring may be damaged. Tighten screw
19
to the plate
17
of heater strut assembly until connector
13 can’t move.
When installing the cell assembly 6 , replace the metal O-ring
7
with a new one.
11.1.4 Replacement of Flame Arrestor Assembly
If it takes longer for the analyzer to return to read the concentration of a sample gas after calibration,
the flame arrestor may have become clogged. Inspect the flame arrestor and if necessary, clean or
replace it.
Set the flame arrestor assembly
1
in place using a special pin spanner (with a pin 4.5 mm in
diameter: part no. K9471UX or equivalent). If a flame arrestor assembly that has already been
replaced once is used again, apply grease (NEVER-SEEZ: G7067ZA) to the threads of the flame
arrestor assembly.
If the flame arrestor assembly is clogged with dust, replace it with new one or wash it.
In case of the ATEX flameproof model (MS Code: ZR202S-A-...) or IECEx flameproof model (MS
Code: ZR202S-D-...), the flame arrestor assembly
1
is bonded to the detector
24
with an ceramic
adhesive. To remove the flame arrestor assembly
1
, crack the hardened adhesive on the joint
by tapping it with a flat head screwdriver and a hammer or appropriate tools. After reattaching the
flame arrestor assembly
1
, apply a small amount of ceramic adhesive (part no. G7018ZA), with a
diameter not exceeding 10 mm, to the joint part. Be careful not to allow the ceramic adhesive to enter
between the female and the male screws. Before applying, stir the ceramic adhesive thoroughly. The
ceramic adhesive should be stored in a cool, dark place and has a shelf life of 6 months from the date
of shipment.