Apollo Discovery ASD-2 Aspirating Smoke Detector (29650-082APO)

The Apollo Discovery Aspirating Smoke Detector (ASD) is a point based professional air-sampling unit, designed to complement analogue addressable system technology. It combines standard field serviceable smoke detectors with a stand-alone air sampling solution to provide protection of difficult to access, environmentally demanding, aesthetic or architecturally restricted areas.

The Discovery ASD-2 is supplied as a fully functional aspirating smoke detector containing 2 Discovery Optical Smoke Detectors and a Mini Switch Monitor for fault reporting purposes. For ease of installation and commissioning, the assembly is factory pre-wired and only requires a panel loop and 24Vdc connection to be made in order to bring it into service.

Operation

Air is drawn from the protected area through one or two perforated 25mm pipes per channel. A powerful fan together with sophisticated air-flow monitoring and control circuitry ensures that transport delays are minimised and air-flow is kept within working limits. System status and flow control is continuously displayed (per channel), with on-board fault relays allowing remote fault monitoring of each channel.

Power management ensures that operating current is kept to a minimum, allowing superior performance and optimisation of external power supply and standby battery resources.

Communication

Discovery uses a digital communications protocol which has been developed from the XP95 protocol but differs in that it allows communication in three different modes: (Normal, Read and Write) to allow a more extensive exchange of information and commands than previous analogue addressable ranges. In addition, Discovery can store data in non-volatile memory. 

The Normal mode is identical to the XP95 protocol with the exception that the five additional analogue value bits in the XP95 protocol extension have been re-defined so that the fire control panel is able to distinguish between Discovery and XP95 devices.

The Read mode is used to check information stored in the non-volatile memory of each detector. It is accessed by using a simple extension to the Normal mode communication method from the fire control panel to the detector.

In Write mode the fire control panel is able to write information to the detector by extending the communication method in the same way as in Read mode. During Read or Write modes a detector can signal an alarm by means of the alarm flag and alarm address bits.

Discovery detectors are compatible with XP95 and Soteria. It should be noted, however, that Discovery features will not be available when Discovery is used with XP95 fire control panels. Fire control panels with drift compensation algorithms should disable the algorithms when communicating with Discovery.

For fire control panels running CoreProtocol, please refer to the fire control panel manufacturer’s operating instructions.

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