<11. Inspection and Maintenance>
11-7
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
Remove the four bolts (10) and terminal box (16) with care so that the already disconnected wire
will not get caught in the terminal box.
In case of the pressure compensation type detector, remove the screw (36) and the plate (37) on
the adapter (35). Remove the adapter (35), drawing out the wires of the heater strut assembly
(23) from it.
Loosen screw (19) until heater strut assembly (23) plate can be removed.
There’s no need to remove O-ring (18) which prevents screw (19) from coming out.
Pull out connector (13).
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
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-rings (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 the screw (19) in heater strut assembly
(23) until connector (13) can’t move.
Reassemble in reverse order to the above disassembly procedure.
The two wires with ceramic insulators from the heater strut assembly are heater wires, and the
translucent rubber-sheathed wire is the thermocouple + terminal, and the other wire is the
When installing the cell assembly (6), replace the metal O-ring (7) with a new one.
11.1.5 Replacement of Dust Filter
11.1.6 Replacement of O-ring
two O-rings (21) and (22) are used. (For a pressure compensating model, two O-rings are used
for individual uses. Two O-rings (21) and (22) are used for reference gas and calibration gas
Part No. Description
(7) * K9470BJ Metal O-ring
(14) K9470ZS O-ring with grease
(21), (22) K9470ZP Two pairs of O-rings with grease
*: O-ring used for sensor assembly
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