Rotary valve, Important – Yokogawa GC8000 Process Gas Chromatograph User Manual

Page 388

<6. Maintenance>

6-35

IM 11B08A01-01E

Valve material

•••••••••••••••••

Gas sampling

Liquid sampling

Back fl ash & column switching

Gas sample (for GC6)

Liquid sample (for GC6)

Back fl ash & column switching (for GC6)

Sheet material

•••••••••••••••••

Rulon

Tefl on

Grand material

•••••••••••••••••

SUS316

Hastelloy C

Sample volume of B side

•••••••••••••••••

Not provided

Switching valve

Liquid sample: 0.33 μl

Liquid sample: 1 μl

Liquid sample: 2 μl

Liquid sample: 3 μl

Gas sample: 10 μl

Gas sample: 25 μl

Gas sample: 50 μl

Gas sample: more than 100 μl

Sample volume of A side

•••••••••••••••••

Not provided

Switching valve

Liquid sample: 0.33 μl

Liquid sample: 1 μl

Liquid sample: 2 μl

Liquid sample: 3 μl

Gas sample: 10 μl

Gas sample: 25 μl

Gas sample: 50 μl

Gas sample: more than 100 μl

Purge/Suction

Yes/No

•••••••••••••••••

Not provided

Purge

Suction



Rotary valve

(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.

IMPORTANT

• During the purge, purge gas may fl ow into the sample return line, causing pressure

fl uctuation.

Prepare the sample return line and collection tank, if necessary.
• Prepare the sample return line so that the sample does not return.

(5) Stop the supply of power.

2nd Edition : May 11, 2012-00