<1. GENERAL>
1-11
IM 12T03A01-02E
1.4
Cautions in Handling Flameproof,
Explosion-proof Instruments
1.4.1
Outline of Explosion-proof Instruments
Specifications of “Explosion-proof 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, explosion-proof 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 explosion-proof regulations and the cautions marked on the analyzer shall be strictly
observed when using Model VD6DF in a hazardous location.
WARNING
Model VD6D and Model VD6DS Density Detector, which are not “explosion-proof instrument”,
cannot be installed in hazardous location.
Model VD6DF density detector has either TIIS or FM flameproof type of explosion-proof
specifications. The TIIS type has passed tests conducted by a public authority in accordance with
the Labor Safety and Health Law (Japan) which regulates domestic explosion-proof electrical
equipment. The FM type has been certified to have an explosion-proof 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 flameproof 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 Explosion-proof Specifications
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 1.1 TIIS Flameproof Type (Explosion-proof) 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 Explosion-proof Specifications
The Model VD6DF density detectors complying with FM explosion-proof specifications is labeled
data plate which is marked with an approval mark, classification of hazardous location, working
ambient temperature range, and handling cautions.
5th Edition : Dec. 11, 2015-00
Содержание vigilantplant DM8
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