Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 10)

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IM 11B03A03-01E 3rd Edition : Aug. 23. 2006-00
(6) Maintenance and inspection
During usual maintenance and inspection, it is not necessary to check the explosion-
protected section.
Before opening the door of the explosion-protected section for maintenance and inspec-
tion, be sure to turn off the power. After completing maintenance and checks, close the
door completely then turn on the power after checking that the specified explosion protec-
tion performance is guaranteed. The parts to be checked are described in the Maintenance
and Inspection Manual (IM 11B03A03 - 04E).
If any of the following damage occurs, contact a Yokogawa sales representative or the
Yokogawa sales division
(1) If the screws securing the Protection System (explosionproof construction) are dam-
aged
(2) If the exterior or light transmission section of the enclosures is damaged
(3) If packings are cracked or conspicuously deformed
(7) Override function (The analyzer with optional code "FM/CSA Type Y
purg
ing" does not have this function.)
WARNING
• When the override function is used, Analyzer becomes an ignition source and the high
temperature and the high voltage part will be exposed.
• Please confirm that in the ambient atmosphere, the concentration of explosive gases
is less than the allowable limit, by using a gas detector.
To return to the normal operation, turn off “the override switch” and then close the door as it
was before turning on power.
In this analyzer, if the pressure of the pressurized / type X purged enclosure system (oven,
electronic section) drops while the power is on, the pressurized explosion protection sec-
tion is activated to stop power supply. Therefore, in case of opening the door of the oven or
of the electronic section inadvertently, for maintenance, while the power is on, the protec-
tion system is activated to cut off the power.
The “override function” intensively releases this function of protection system.
The override switch is installed in section.
(8) Replacing parts
Always use parts specified by Yokogawa when replacing parts, for replacement, refer to the
Maintenance and Inspection Manual (IM 11B03A03 - 04E).