Instruction Manual

<6. Maintenance>

6-53

IM 11B08A01-01E

(6) Remove the pipes connected to the atmospheric pressure balancing valve and needle valve

for controlling the ﬂ ow rate.

(7) Remove the four screws holding the bracket.

(8) When replacing atmospheric pressure balancing valve, remove two screws on the back side

of the bracket. When replacing ﬂ ow rate control needle valve, remove the nuts on the front

side of the bracket.

(9) After replacing each components with new ones, reassemble in the reverse order of steps

(6) to (8).

(10) Conﬁ rm that the piping is correct and there are no leaks.

L9853AA Needle valve

K9192WP

Atmospheric pressure balancing valve (Diaphragm: Teﬂ on, Wetted surface: Viton)

K9192WQ

Atmospheric pressure balancing valve (Diaphragm: Teﬂ on, Wetted surface: Silicone)

F0246.ai

Atmospheric Pressure

Balancing Valve

Sample Flow Rate

Adjusting Needle Valve

Screw (four)

Figure 6.46 Atmospheric Pressure Balancing Valve and Sample Flow Rate Adjusting Needle Valve

(3) Flowmeter

See Figure 6.47.

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

(2) Turn off the supply of the sample.

(3) If the sample is liquid, purge the sample line with the purge gas (nitrogen gas or instrument

air).

• When the stream switching valve is a pneumatic valve, change the analyzer status to

Manual and turn on the stream switching valve on the sample line to let the purge gas ﬂ ow

in.

• When the stream switching valve is a stop valve, close all the stop valves and open the stop

valve on the sample line to let the purge gas ﬂ ow in.

(4) Close all the stream switching valves.

2nd Edition : May 11, 2012-00