IFD-E(IS) Intrinsically Safe Flame Detector User Manual
Hochiki Europe (UK) Ltd General Description This Installation Guide gives information on the intrinsically safe (I.S.) version of the flame detectors that have been approved by BASEEFA (British Approvals Service for Electrical Equipment in Flammable Atmospheres). The requirements of the European Community Directive 94/9/EC, the ATmosphere EXplosives ATEX Directive have been met. The approval have been accessed to European Standards EN 50014, EN 50020 and EN 50284.
Hochiki Europe (UK) Ltd 3 These flame detectors are designed to meet the requirements of Group II apparatus. For the type of protection “i” intrinsically safe, Group II is subdivided into Equipment Categories, Type of Explosive Atmosphere (Table 1), Type of Protection Code (Table 2), Temperature Class (Table 3) and Gas Group (Table 4).
Hochiki Europe (UK) Ltd Temperature Class Referred to ambient of -20°C to +40°C T6 Type of Protection Code Equipment Category ia Intrinsic safety 1 ib Intrinsic safety 2 d Flameproof 3 Code These Flame Detectors are approved ia.
Hochiki Europe (UK) Ltd 5 Intrinsically Safe Product Technical Data Mechanical Housing Material: See Fig 1 Housing Colour: Housing Dimension: (Excluding Mount) Cable Gland Entries: Die Cast Zinc Alloy Blue (typical) Height = 142mm Width = 108mm Depth = 82mm 2 X 20mm Electrical Fig. 1 Intrinsically Safe Flame Detector (Alloy Housing) The flame detectors respond to light emitted from flames during combustion.
Hochiki Europe (UK) Ltd System Design Engineers familiar with codes of practice for hazardous area systems should only undertake the design of an intrinsically safe fire detection system. In Europe the standard is EN 50014, Electrical apparatus for potentially explosive atmospheres – General requirements. The fire detector performance is the same as the standard none intrinsically safe counterparts.
Hochiki Europe (UK) Ltd 7 Galvanically isolated barriers are widely used with conventional flame detector systems. If the system is of an addressable type with signal pulses on the supply lines then the response time of most standard barriers will be too slow to allow their use. In these applications special galvanically isolated barriers are required that can freely transmit the required protocol pulses without introducing severe voltage drops.
Hochiki Europe (UK) Ltd Wiring and Cable Types It is not permitted to connect more than one barrier circuit in the hazardous area to any other circuit. Both separate and twin cables may be used. A pair contained in a type ‘A’ or ‘B’ multicore cable (as defined in clause 5.3 of EN50 039) may also be used, provided that the peak voltage of any circuit contained within the multicore does not exceed 60V.
Hochiki Europe (UK) Ltd 9 Installation It is important that the IS detectors are installed in such a way that all terminals and connections are protected to at least IP20 with the detector cover fitted. The earth bonding terminals are provided for convenience where continuity of a cable sheath or similar is required Service & Repairs Servicing of IS flame detectors may be carried out only by a BASEEFA or equivalent authorised body.
Hochiki Europe (UK) Ltd IS System Drawing NOTE 1 Each Barrier fed circuit must be a separate circuit and must not be connected with any other electrical circuit. NOTE 2 The electrical circuit in the hazardous area must be capable of withstanding an AC test voltage of 500 volts RMS to earth or frame of the apparatus for one minute.
Hochiki Europe (UK) Ltd 11 Hochiki Europe (UK) Ltd Grosvenor Road, Gillingham Business Park, Gillingham, Kent, ME8 0SA, England Telephone: +44(0)1634 260133 Facsimile: +44(0)1634 260132 Email: sales@hochikieurope.com Web: www.hochikieurope.com Hochiki Europe (UK) Ltd. reserves the right to alter the specification of its products from time to time without notice.
