Yokogawa DM8C/VD6 Liquid Density Analyzer - Manual (Page 21)

< 1. GENERAL >
1-11
IM 12T03A01-02E
1.4 Cautions in Handling Flameproof, Explosionproof
Instruments
1.4.1 Outline of Explosionproof Instruments
Specifi cations of “Explosionproof Instruments” conform to the regulations of relevant public
organizations.
Model DM8 Vibration Type Liquid Density Meter consists of a density detector and a density converter.
Model VD6DF density detector, explosionproof instrument, can be installed in hazardous area where
explosive gases may be generated.
It should be noted, however, that the method of installation, ambient conditions, and the handling of
these instruments must conform to the regulations of relevant public organizations. The applicable
explosionproof regulations and the cautions marked on the analyzer shall be strictly observed when
using Model VD6DF in a hazardous location.
CAUTION
Model VD6D and Model VD6DS Density Detector, which are not “explosionproof instrumment”,
cannot be installed in hazardous location.
Model VD6DF density detector has either TIIS or FM fl ameproof type of explosionproof specifi cations.
The TIIS type has passed tests conducted by a public authority in accordance with the Labor Safety
and Health Law (Japan) which regulates domestic explosionproof electrical equipment. The FM type
has been certifi ed to have an explosionproof construction meeting the requirements of NEC (National
Electrical Code) by Factory Mutual Research Corporation, U.S.A. (FM), a testing organization. It also
conforms to requirements of OSHA (Occupational Safety and Health Act, U.S.A.).
Items 1.4.2 to 1.4.6 cover general cautions in using the Model VD6DF density detector. For further
details, see the following publications:
• For TIIS fl ameproof requirements
‘RECOMMENDED PRACTICE’ for Electrical Equipments for Use in Explosive Gas Atmosphere
published by The Research Institute of Industrial Safety, Ministry of Labor.
• For FM Flameproof requirements
National Electrical Code, Chapter 5, Special Occupancies.
1.4.2 Labeling the Explosionproof Specifi cations
TIIS Flameproof type of explosion-protected construction
The Model VD6DF density detector is labeled data plate on which type of the explosion-protection
constructions, approval number, symbols for the type and working ambient temperature range.
Table 4.1 TIIS Flameproof Type (Explosionproof) Construction of Vibration Density Detector
Model and codes Type Approval No.
Symbol for the type (including
explosion class and ignition group)
Model VD6DF-N1
Model VD6DF-S3
No. T21726
No. T21727
d2G3
d2G3
FM Explosionproof Specifi cations
The Model VD6DF density detectors complying with FM explosionproof specifi cations is labeled data
plate which is marked with an approval mark, classifi cation of hazardous location, working ambient
temperature range, and handling cautions.