Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 110)

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IM 11B08A01-01E
It is not recommended to use the auto-operation starting function for FPD detector because it
is necessary to operate pneumatic pressure for fuel two times as the value written in “operation
condition setting” in the Operation Material.
If FPD is lit up with the pneumatic pressure for fuel at the operation condition setting value as is, a
peak may not appear in the chromatogram and only the base line may be output.
The operation of the analyzer when “Auto-operation setting” is set to “Yes” is described below.
(1) Following the power supply for the electronic section of the control unit, immediately after
power is supplied to the oven unit circuit section, the hydrogen limiting unit is turned on
automatically.
For the model in which H2 is not used for carrier gas and utility gas, the hydrogen limiting unit is
not equipped. If there is no hydrogen limiting unit, move to 2) operation after power is supplied to
the electronic section of control unit and oven unit.
(2) After a lapse of “the 1st auto-start time,” automatically turn on the oven, LSV, and FPD
heater.
(3) After a lapse of “the 2nd auto-start time,” automatically turn on the detector.
(4) After a lapse of “the 3rd auto-start time,” automatically perform the Run command of
the stream sequence 1 at process status. When the mode is switched from Stop mode
to run mode, start “warming up time” to substitute the sample stream according to the
method, which was set at the fi rst stream sequence 1. When the “warming up time” lapsed,
measurement starts.
When the measurement start condition is not met at the starting of Run mode due to the reasons
such as SV value of each types of heater temperature is not PV value, or detector is not at ON
status, the level 3 alarm “#434 operation mode change failure” occurs, and auto-operation will not
be started.
In addition, if the level 1 alarm is generated during the Run mode after the auto-operation is
started, the mode is switched to Stop mode after a lapse of the main cycle time of the stream
during measurement, when an alarm is generated.
The following table explains the setting for auto-operation starting functions.
The changed set values become effective by restarting the analyzer.
The analyzer has one setting overall, not for each GCM.
2nd Edition : May 11, 2012-00
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