Halma Ampac Orbis IS ORB-OP-52027-APO Product Manual Download

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MAN3041-1

Intrinsically safe circuits

When using these enclosures with intrinsically safe systems, it is important that segregation be provided
between the IS and non-IS circuits. A distance of at least 50mm must be preserved between live conducting
parts of IS and other circuits.

If the enclosure is used as part of an IS circuit, then it must always be installed inside the safe area.

Never

install these enclosures in the hazardous area.

Summary of Contents for Ampac Orbis IS ORB-OP-52027-APO

Page 1: ...Fire detection and evacuation solutions that save lives Orbis IS Product Guide MAN3041 1...

Page 2: ...nviornmental Performance 11 6 4 Technical Data 12 7 Orbis IS Heat Detector 13 7 1 Where to use heat detectors 13 7 2 Choosing the correct class of heat detector 13 7 3 How does Orbis IS heat detectors...

Page 3: ...detectors which has been developed from the standard range of Orbis smoke and heat detectors Orbis IS is a range with modern styling and a TimeSaver IS base It is electrically compatible with Series 6...

Page 4: ...uipment Regulations 1999 Detectors have been declared as being compliant with the essential requirements of the EMC Directive 98 336 EEC the Construction Products Directive 89 106 EEC and the ATEX Dir...

Page 5: ...tion and cable termination Wide operating temperature range StartUp for fast commissioning DustDefy housing which limits ingress of dirt into detector New optical sensor for high reliability reduced f...

Page 6: ...of optical detectors in the standard test fires described in the European standard EN54 7 2000 The results of these tests are given in Figure 1 The graph shows the acceptable response in terms of smok...

Page 7: ...een Orbis Optical Multisensor How are heat detectors classified EN54 5 2000 classifies heat detectors according to the ambient temperature in which they will be working An additional classification ma...

Page 8: ...MAN3041 1 8 So what is the best way to choose a heat detector To make things easier we have produced a flow chart to help you decide Figure 3 Choosing a Heat Detector...

Page 9: ...ensation for slow changes in sensitivity Extra confirmation of smoke before alarm signal given The algorithms are used to verify signals from the sensing chamber to filter out transients and to decide...

Page 10: ...20 seconds Minimum detector active voltage 12V dc Switch on surge current 105 A at 24V dc Quiescent current 85 A at 24V dc Alarm load 325 in series with 1 0V drop Material Detector and base moulded i...

Page 11: ...reas where the fire risk is likely to include heat at an early stage in the development of the fire As with Orbis IS optical smoke detectors the increased reliability of detection is combined with hig...

Page 12: ...A at 24V dc Alarm load 325 in series with 1 0V drop Material Detector and base moulded in white polycarbonate Alarm Indicator Integral indicator with 360 visibility Dimensions and weight of detector...

Page 13: ...er possible since smoke detection provides earlier warning of fire than heat detection There are however limits to the application of smoke detectors and these are described in the section 4 Choosing...

Page 14: ...midity unless specified otherwise Detector operating principle Measurement of heat by means of a thermistor Sampling frequency Once every 2 seconds Supply voltage 14 28V dc Supply wiring 2 wires polar...

Page 15: ...re positive IN positive OUT negative IN and OUT common terminal remote LED negative connection functional earth screen The terminal screws are captive screws and will not fall out of the terminals The...

Page 16: ...ovided It is not necessary for the correct operation of the detector nor is it provided as a termination point for a safety earth If screened cable is used screen continuity should be maintained and t...

Page 17: ...ts for 4 minutes so it may be necessary to reset or de power the circuit to allow all detectors to be observed The LED status is the same as method 1 above 8 3 Orbis LED Status Indication Feature Desc...

Page 18: ...ng passive devices they also impose the minimum of restrictions on the operation of the fire detectors Thus single channel barriers are available either as positive or negative polarity where the pola...

Page 19: ...max out 93 3mA W max out 0 67W In any safety barrier used the output current must be limited by a resistor R such that I max out Uz R A number of shunt zener diode barriers meet this specification and...

Page 20: ...The connection must be such that the impedance from the connection point to the main power system earth is less than one ohm Intrinsically safe circuits in the hazardous area should be insulated from...

Page 21: ...ulate the total capacitance or inductance for the length of cables in the hazardous area refer to Table 5 which gives typical per kilometre capacitance and inductance for commonly used cables Note All...

Page 22: ...at segregation be provided between the IS and non IS circuits A distance of at least 50mm must be preserved between live conducting parts of IS and other circuits If the enclosure is used as part of a...

Page 23: ...eCatalogue Note that the earth terminal in the base is provided for convenience where continuity of a cable sheath or similar is required It is not necessary for the correct operation of the detector...

Page 24: ...should be carried out as recommended by the code of practice BS 5839 Part 1 or other local regulations in force 17Achnowledgement All Orbis IS detectors and products are manufactured for Ampac by Apo...

Page 25: ...MAN3041 1 25 AMPAC TECHNOLOGIES UNCONTROLLED DOCUMENT NOTE Due to AMPAC s commitment to continuous improvement specifications may change without notice...

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