Yokogawa GD40 Gas Density Detector - Manual (Page 2)

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IM 11T3E1-01E
Introduction
The GD402 gas density meter and the GD40 detector not only provide continuous measurement
of gas density, but also several other valuable parameters, including specific gravity and molecu-
lar weight. The GD40 detector is designed for intrinsically safe and flame-proof, explosion pro-
tected applications. It is designed to be virtually maintenance free for all accepted applications.
The GD402 is a rugged microprocessor-based converter designed in two versions to meet both
general area and explosion-proof application requirements. In addition to the display of several
key data items, the converter also provides the choice of three different means for calibration:
automatic; semi-automatic and one-touch manual operation.
Before use, read this manual thoroughly in order to fully realize the capabilities of the Meter.
The topics and information that require special attention when handling the product are given in
the text of this manual along with cautionary notes - WARNING or CAUTION - which reflect the
importance of the information.
For safety reasons or to avoid possible damage to your equipment, strictly adhere to every
cautionary note that appears in this manual. Cautionary notes, such as a WARNING, that also
appear on the product itself are indicated together with the alert symbol shown below:
Throughout this user’s manual, you will find several different types of symbols are used to identify
different sections of text. This section describes these icons.
WARNING
Identifies instructions that must be observed in order to avoid physical injury and electric shock or
death of the operator.
CAUTION
Identifies instructions that must be observed in order to prevent the software or hardware from
being damaged or the system from becoming faulty.
NOTE
Identifies important information required to understand operations or functions.
TIP
Identifies additional information.
SEE ALSO
Identifies a source to be referred to.
Clicking a reference displayed in green can call up its source, while clicking a reference
displayed in black cannot.
Media No. IM 11T3E1-01E (CD) 7th Edition : June 2012 (YK)
All Rights Reserved Copyright © 1998, Yokogawa Electric Corporation