YOKOGAWA GD402G /M1, User Manual

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<3. Operation>
3-1
IM 11T03E01-51E
3. OPERATION
This chapter explains how to operate the GD402 Analyzers.
3.1 Preparation for Operation
WARNING
• DO NOT supply power to the analyzer when inspecting it.
• Leave the power switch which is built in the converter, in the ON position.
• When using the converter under high ambient temperatures, be careful as the metal parts of
the converter will also be hot.
3.1.1 Inspecting Installation, Piping and Wiring
Workmanship
Before turning the power on, inspect workmanship with regards to installation, piping and wiring
as instructed below:
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Examine how the GD402 analyzer and its peripheral equipment are installed.
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Check the sample-gas line, which feeds the GD40

detector, for any gas leakage.
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Inspect the system to ensure that the GD402 analyzer and its peripheral equipment are
wired correctly. After inspection, shut the terminal box cover securely.
3.1.2 Supplying Power
First make sure that when the GD402 analyzer is turned on, no control instruments connected to
the analyzer will come into operation by the signals transmitted from the analyzer. Next, turn on
the external power switch to start the analyzer. At that point, make sure the internal power switch
is in the ON position if the converter is an explosion-protected model.
After power-on, the analyzer will begin to operate in the measurement mode.
[Major Items Shown in Measurement Mode]
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Measured Values
In the Message selection under the DISP mode, choose the item you want to show.
Item
No. of Digits and Position
of Decimal Point
Message
Physical density XX.XXXX KG/M3
Physical density X.XXXXX LB/FT3
Compensated density X.XXXX KG/M3
Compensated density X.XXXXX LB/FT3
Calorific value XXX.XXX MJ/M3
Calorific value X.XXXX KBTU
Specific gravity X.XXXX SP GR
Molecular weight XXX.XX MOL
Concentration XXX.X VOL%