Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 118)

<2. Installation, Piping, and Wiring>
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IM 11B08A01-01E
2. Installation, Piping, and Wiring
If the process gas chromatograph is installed in a hazardous area, do the wiring according to the
applicable explosionproof requirements.
2.1 Installation
Refer to “1.1 Wiring and Piping Diagram.”
2.1.1 Installing the Analyzer
Two types of analyzer are available: self-standing and wall-mounted. Install the chromatograph
according to the procedure for each type.
(1) Installation site
The following conditions must be met:
(a) Satisfying
specifi ed environmental conditions (atmospheric gases) even if it is a hazardous
area.
(b) No vibration
(c) Not subject to rainfall or direct sunlight
(d) No corrosive gas and little dust
(e) Environmental temperature: –10 to 50°C, humidity: 95% RH or less
(f) Altitude of installation site: Max. 2000 m above sea level
(g) Installation category based on IEC 1010: II (See NOTE)
(h) Pollution level based on IEC 1010: 2 (See NOTE)
NOTE:
• The “Installation category” indicates the regulation for withstanding impulse voltage. It is also called the
“Overvoltage category”. “II” applies to electrical equipment.
• “Pollution level” describes the degree to which a solid, liquid or gas which degrades dielectric strength is
adhering. “2” applies to a normal indoor atmosphere.
(2) Analyzer house
If the analyzer is installed outdoors, it should be constructed so as to protect it from rain and
direct sunlight and to facilitate inspection and maintenance.
Figure 2.1 shows an example of an analyzer house.
The house should be designed to provide space for standard gas cylinders because the effects
of the ambient temperature on standard gas can be better controlled indoors than outdoors.
It is also desirable for maintenance that the house accommodates an external sampling system if
any, except when leakage of toxic or fl ammable standard gas is to be avoided indoors.
The fl oor area shown in Figure 2.1 is the minimum requirement for the house. Allow as much
area as possible for the house taking into consideration the types of items to be accommodated
and the space required for maintenance.
For the maintenance space, refer to “1.2 External Dimensions.”
Provide ventilation openings in the upper portion (near the ceiling) and lower portion (near the
fl oor) of a side wall of the house.
Also provide a window and electric lights.
Carrier gas cylinders, should be protected from exposure to direct sunlight and rainfall by placing
them under the eaves of the house.
2nd Edition : May 11, 2012-00
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