Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 51)

<1. Overview>
1-24
IM 11B08A01-01E
(2) Electronic Section
The electronic section of the control unit and the electronic section of oven units 1-3 (including
the EPC box) connect with one another to form a single pressurized enclosure.
The electronic section of the control unit controls the electronic section of oven units 1 to 3,
calculates, and communicates I/O data with external devices.
The GC-HMI (Human Machine Interface: a 12-inch color LCD touch panel) mounted on the
front makes it easy to check analysis results, trend data, and parameters, and thus monitor the
measurement condition of devices on the screen.
The electronic section of oven units 1 to 3 controls the large isothermal oven or the isothermal
oven; detector, RV, LSV, hydrogen limiting unit, atmospheric-pressure balancing valve, and EPC,
and sends the data to the electronic section of the control unit.
(3) Pressure and Flow Control Section
The pressure and fl ow control section controls the pressures and fl ow rate of protection gas (air),
carrier gas, and utility gas, and displays their pressures. The connections for supplying carrier
gas and utility gas or air output, the hydrogen limiting unit, and the vortex tube (cooling device for
FDD) are installed. The specifi cation determines the number and types of parts installed.
This section is on the right side of the control unit and on the front and right side of oven units 1 to
3.
(a) The pressure control section of the control unit
The connection for air output for stream valves is equipped in the pressure control section on the
right side of the control unit, and the pressure regulator is equipped under the cover.
There are up to eight air outputs for stream valves. The connection is a 6-mm or 1/4-inch tube. Air
pressure is 350 kPa. They may be used in GCSMP or sampling units.
The manifold regulators adjust the following pressures, and display them. Each setting
pressure is described in the operational manual, and can be checked on the operation condition
confi guration screen of the EtherLCD.
• Pressure for operating solenoid valves:
Air pressure which is applied to the solenoid valves for operating RV, LSV, air-operated
valves of the hydrogen limiting unit, atmospheric-pressure balancing valves (including air
output to outside), and stream valves (including air output to outside). Setting pressure: 350
kPa.
• Air pressure for the electric chamber:
Air pressure which is applied as protection gas to the pressurized enclosure, which consists
of the electronic section of the control unit and the electronic section of oven units 1 to 3
(including the EPC box).
The setting pressure is described in the operational manual.
• Air pressure for oven units 1 to 3:
Air pressure which is applied as protection gas to the large isothermal oven or the
isothermal oven. The setting pressure is described in the operational manual.
Refer to Figures 1.6 to 1.7.
2nd Edition : May 11, 2012-00