User Manual

IM 11M13A01-04E
11-7
11. Inspection and Maintenance
Replacement of heater strut assembly
Refer to Figure 11.4 as an aid in the following discussion.
Remove the cell assembly
11
, following Section 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
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
8
with grease (NEVER-SEEZ: G7067ZA) and
tighten the screw
8
with a special tool (part no. K9470BX or equivalent) with a
tightening torque of 12N•m 6 10%.
Next, to install the O-rings
22
on the calibration-gas and reference-gas pipes, disas-
semble 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 secure connector
13
.
When installing the cell assembly
6
, replace the metal O-ring
7
with a new one.
11.1.4 Replacement of flame arrester assembly
If it takes longer for the analyzer to return to read the concentration of a sample gas
after calibration, the flame arrester may have become clogged. Inspect the flame arrester
and if necessary, clean or replace it.
Set the flame arrester 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 arrester assembly that has
already been replaced once is used again, apply grease (NEVER SEAZE: G7067ZA) to
the threads of the flame arrester assembly.
If the flame arrester 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 arrester assembly
1
is bonded to the
detector
24
with an ceramic adhesive. To remove the flame arrester 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 arrester assembly
1
, apply a
small amount of ceramic adhesive (P/N 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.