Hochiki IFD-E(EXD) - Manual (Page 7)

Hochiki Europe (UK) Ltd 7
2-3-0-810/ISS3/OCT11
System Design
Engineers familiar with codes of practice for hazardous area systems should only undertake the design of
an flameproof fire detection system. In Europe the standard is EN 60079-0 (formally EN 50014), Electrical
apparatus for potentially explosive atmospheres – General requirements.
The fire detector performance is the same as the standard none flameproof counterparts. Performance
information given in standard product guides is therefore applicable to the flameproof range.
The ISSeP certification of the flameproof device enclosure covers their characteristics as components of
a flameproof system. This indicates that the flame detectors can be used with a margin of safety in such
systems.
Service & Repairs
Frequent inspection should be made. A schedule for the maintenance check should be determined by the
environment and frequency of use but should be regular enough to ensure the detector continues to
operate in the designed manner. It is recommended that it should be at least once a year.
1. External surfaces of the enclosure should be periodically cleaned to ensure dust deposits are not
allowed to accumulate.
2. Check flamepath/threads on enclosure body and lid for signs of corrosion. If badly pitted, replace
component.
3. All components that are replaced must be in accordance with the manufactures specification.
Failure to use such components may invalidate the certication/approval on the enclosure and
may make the enclosure dangerous.
4. After inspection and maintenance have been carried out, items 3 & 4 of the installation
instructions should be adhered to when resealing the enclosure.
5. Servicing of the fire protection system should be carried out as recommended by the local
regulation in force.
Selection of Cable Glands
Application of barrier glands certified and approved to meet EN 60079-14 for Thermo Plastic,
Thermosetting and Elastomeric Cables.
Hazardous Area Type Gland Method
1)
Zone 1, 2 21 & 22 Hazardous areas
requiring IIC apparatus EExd Barrier Glands
mandatory
2)
Zone 2 & 22 Hazardous areas requiring IIA
& IIB apparatus. Any EExd Gland
permitted
Table 5 Examples of barrier glands