Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 177)

<3. Basic Operation and Startup>
3-26
IM 11B08A01-01E
(4) Checking the baseline
To confi rm that the detector operates normally, press the (CHROM) in the navigation bar
on the analyzer operation screen and display the baseline on the Chromatogram screen and
compare it with the chromatogram in the Operation data. If the signal level and noise of the
baseline signifi cantly differ from those of the chromatogram in the Operation data, there may be
something wrong with the detector, detector card, or wiring.
3.2.5 Measuring the standard sample (gas or liquid)
CAUTION
Always measure the standard sample after installation to confi rm that nonconformity has not
occurred with equipment by transportation, installation work, or others. The measurement result
at the factory is attached to the Operation data; compare it with the measurement result of the
standard sample.
(1) Connecting a standard gas cylinder or standard liquid pump
Connect a standard gas cylinder or a standard liquid pump to the standard sample line. If there
are two or more streams of the standard sample line, connect a standard gas cylinder properly
according to the Stream setting and Individual peak setting in the Operation data. When a small-
sized standard liquid pump is connected to the standard sample line, the capacity of the standard
liquid may become short. In such a case, remove the joint of the pipe connecting the sample
process section with the isothermal oven and connect a standard liquid pump.
(2) Substituting the standard sample line
Measure the standard sample after thoroughly substituting the sample stream according to the
following procedure:
 The automatic stream valve
(1) Change the user level.
(2) Press
the (OPR) in the navigation bar on the analyzer operation screen.
(3) Open the GCM tab.
(4) Set the operation mode to Manual.
(5) Press GCM VLV Control in the GCM tab.
(6) Press ON/OFF under Str VLV.
(7) Confi rm that all stream valves are closed.
(8) Select the number of the valve to be operated and press OK.
(9) The message “Turn on the stream valve number
* ” appears on the screen, and then press
Yes.
(10) The stream valve switches.
(11) Control the throttle valve of the sample process section, let the standard sample fl ow and
substitute the standard sample line.
(12) After the substitution of the standard sample is fi nished, operate the stream valve again and
turn it off.
 The manual stream valve
(1) Confi rm that all stream valves are closed.
2nd Edition : May 11, 2012-00