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The XP95 Optical Smoke detector uses an internal pulsing infrared LED and a photo-diode at an obtuse angle. In clear air conditions the photo-diode in the XP95 detector receives no light from the LED and produces a corresponding analogue signal. The signal increases when smoke enters the chamber and light is scattered onto the photo-diode. The optical smoke detector has a clear indicator LED which emits red light when the detector is in alarm.
The XP95 range of analogue addressable fire detectors uses tried and trusted technology to give the best performance, and has unique features that benefit the installer and the end user. It is suitable for medium-to-large applications with simple installation requirements.
As it operates using digital communication, XP95 has a high immunity from corruption, and is, therefore, often preferred in a large system where life safety is critical. XP95 products are frequently used in commercial, industrial, financial, government, IT/telecoms and healthcare applications.
Electrical DescriptionThe detector is designed to be connected to a two wire loop circuit carrying both data and a 17V to 28V dc supply. The detector is connected to the incoming and outgoing supply via terminals L1 and L2 in the mounting base. A remote LED indicator requiring not more than 4mA at 5V may be connected between the +R and -R terminals. An earth connection terminal is also provided.
When the device is energised the ASICs regulate the flow of power and control the data processing. The optical ASIC is controlled by the communications ASIC and pulses the IR LED. The signal from the photo-diode is processed by the optical ASIC and transferred to the communications ASIC where it is then stored. When smoke enters the chamber the photo-diode signal increases.
The information to the A/D converter is updated once per second or when either the monitor or the preceding address is interrogated.
Whenever the device is interrogated this data is sent to the control equipment. EN54 threshold alarm levels are calibrated within theprocessing ASIC. If the eviceis not addressed within one second of its last polling and the analogue value is greater than the EN54 alarm level the alarm flag is initiated and the device address is added to the data stream every 32 polling cycles from its last polling for the duration of the alarm level condition, except when the alarming device is being interrogated. This can providea location identified alarm from any device on the loop in approximately two seconds.
The detector is calibrated to give an analogue value of 25±7 counts in clean air. This value increases with smoke density. A count of 55 corresponds to the EN54 alarm sensitivity level.
OperationThe XP95 optical detector uses the same outer case as the ionisation smoke detector and is distinguished by the indicator LED which is clear in standby and red in alarm. Within the case is a printed circuit board which on one side has the lightproof labyrinth chamber with integral gauze surrounding the optical measuring system and on the other the address capture, signal processing and communications electronics.
An infrared light emitting diode within its collimator is arranged at an obtuse angle to the photo-diode. The photo-diode has an integral daylight-blocking filter.
The IR LED emits a burst of collimated light every second.
In clear air the photo-diode receives no light directly from the IR LED because of the angular arrangement and the dual mask. When smoke enters the chamber it scatters photons from the emitter IR LED onto the photo-diode in an amount related to the smoke characteristics and density. The photo-diode signal is processed by the optical ASIC and passed to the A/D converter on the communications ASIC ready for transmission when the device is interrogated.
ApplicationThe choice of detector from the XP95 range follows the well established principles of system design. That is, the optimum detector type will depend on the type of fire risk and fire load, and the type of environment in which the detector is sited.
For general use, smoke detectors are recommended since these give the highest level of protection. Smoke detectors from the XP95 range may be ionisation, optical or multisensor types. It is generally accepted that ionisation types have a high sensitivity to flaming fires whereas optical detectors have high sensitivity to smouldering fires. As a result of this, ionisation types are widely used for property protection, and optical types for life protection. These general principles still apply to XP95 detectors although the availability of a multisensor in the range offers more choice to the systemdesigner.
The multisensor is basically an optical smoke detector and will therefore respond well to the smoke from smouldering fires.The detector also senses air temperature. This temperaturesensitivity allows the multisensor to give a response to fast burning (flaming) fires, which is similar to that of an ionisation detector. The multisensor can therefore be used as an alternative to an ionisation detector - particularly since restrictions on the transportation of ionisation detectors have been introduced.
Where the environment is smoky or dirty under normalconditions, a heat detector may be more appropriate. It must be recognised, however, that any heat detector will respond only when the fire is well stablished and generating a high heat output.
Unless otherwise specified, devices described in this guide are suitable for indoor use only.
Device AddressingThe XP95 detectors provide an alarm facility that automatically puts an alarm flag on the data stream and reports its addresswhen the pre-set EN54 thresholds are exceeded. The devices provide great flexibility in system design with the control equipment determining the characteristics of the system. A large and growing range of compatible control equipment is available from many sources - details are included in Apollo publication PP1010, which is available on request.
Maintenance & ServiceDetectors should be maintained according to BS 5839-1 or other locally applicable code. Test equipment can be ordered from Apollo for testing smoke and heat detectors.
Detectors should not be cleaned in the field except for careful removal of exterior dirt with a damp cloth. For cleaning and recalibration detectors should be returned to Apollo Fire Detectors or to the local distributor.
EMC Directive 2014/30/EUThe XP95 Optical Smoke Detector complies with the essential requirements of the EMC Directive 2014/30/EU, provided that it is used as described.A copy of the Declaration of Conformity is available from Apollo upon request.Conformity of the XP95 Optical Smoke detector with the EMC Directive, does not confer compliance with the directive on any apparatus or systems connected to them.
Construction products regulation 305/2011The XP95 Optical Smoke Detector complies with the essential requirements of the Construction Products Regulation 305/2011/EU.A copy of the Declaration of Performance is available from Apollo upon request.
Environmental CharacteristicsThe XP95 optical smoke detector is unaffected by wind or atmospheric pressure and operates over the temperature range -20°C to +60°C.
Product InformationThe XP95 Optical Smoke detector uses an internal pulsing infrared LED and a photo-diode at an obtuse angle.In clear air conditions thephoto-diode in the XP95 detector receives no light from the LED and produces a corresponding analogue signal. The signal increases whensmoke enters the chamber and light is scattered onto the photo-diode. The optical smoke detector has a clear indicator LED which emits red light when the detector is in alarm.
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