Instruction Manual

<6. Maintenance>

6-33

IM 11B08A01-01E

CAUTION

The isothermal oven is extremely hot after turning off the power immediately. Keep the purging

air supplied for more than an hour after turning off the power. Keep hands away from the oven

components.

(3) Turn off the supplies of the purging air, carrier gas, hydrogen (or nitrogen) gas for

combustion, combustion air, and sample gas.

(4) Open the control unit door using a key included in the accessory kit.

(5) Remove the three couplings connected to the FID. When removing the couplings, label

them for ease of identifying the connections later.

(6) Remove the six screws from the cover of the electronics section in the oven unit by using a

hex wrench (an accessory) and open the cover.

(7) Remove the wires connected to the FID card from the connectors, and pull into the

isothermal oven through the bushing holes.

(8) Remove the two screws which ﬁ x the FID.

(9) Install a new FID.

(10) Reconnect the wires and pipes in the reverse order of steps (5) to (8). Conﬁ rm wiring and

perform a leak test.

Low temp. type K9194XA For normal usage (SUS316)

K9194XB Corrosion-resistant type (Hastelloy C)

High temp. type K9803UN For normal usage (SUS316)

K9803UQ Corrosion-resistant type (Hastelloy C)

F0229.ai

Mounting screws

Figure 6.29 FID

(5) Methanizer

The methanizer is used in conjunction with the FID to measure low-concentration carbon

monoxide or dioxide. See Figure 6.30.

(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).

(2) Stop the supply of power.

2nd Edition : May 11, 2012-00