Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 40)

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IM 11B03A03-01E 3rd Edition : Aug. 23. 2006-00
4.1.2 Manual
In the Manual status, various operations and measurements can be performed manually.
The operations available in the Manual mode are:
• On/off of various valves
• On/off of stream valves
• On/off of several heaters
• On/off of several types of detector (only On for FID and FPD)
When the status is transferred from Process to Manual, all the various valves and stream
valves turn Off.
The Manual mode contains the following operation modes.
• Stop: Mode in which measurement stops
• Run: Mode in which measurement runs
For the transitions of the operation modes, refer to Figure 4.1.
The following explain each operation mode in detail.
(1) Stop
In the Stop mode the manual measurement stops.
(2) Run
In the Run mode the manual measurement runs. During the Run mode, the GC1000 Mark
II detects peaks automatically until the mode turns to Stop. When the mode turns to Stop,
the concentration in area percentage is calculated from the area of peaks detected. The
calculated concentration values are displayed on the Laboratory Analysis Results display
panel. For five seconds after the operation mode turns from Run to Stop, the GC1000
Mark II does not accept the run command in order to process analysis calculations and
others.
4.1.3 Lab
In the Lab status the lab measurement runs. The GC1000 Mark II performs continuous
measurements for times specified in the lab settings.
In the Run mode in Process, peaks are detected according to the on/off of the set gate,
while in Lab, peaks are detected automatically like a laboratory GC. This mode can be
used for determining gate timing when a column system is changed.
The Lab mode contains the following operation modes.
• Stop: Mode in which measurement stops
• Run: Mode in which measurement runs
For the transitions of the operation modes, refer to Figure 4.1.
The following explain each operation mode in detail.
(1) Stop
In the Stop mode the lab measurement stops.
(2) Run
In the Run mode the lab measurement runs. In the Run mode, GC1000 Mark II performs
measurements according to the lab settings. If a level 1 alarm occurs during the Run
mode, the mode changes to the Stop mode after an ongoing lab measurement has been
completed.