Description

Apollo Discovery Optical Smoke Detector

Part Number: 58000-600APO

The Discovery Optical Smoke Detector operates using the light scatter principle and is ideal for applications where slow-burning or smouldering fires pose a potential risk.

Operation

The Discovery Optical Detector has a white moulded polycarbonate case with wind-resistant smoke inlets. The two indicator LEDs are red in alarm.

Within the case is a printed circuit board which:

• On one side has the light-proof chamber with integral gauze surrounding the optical measuring system
• On the other side contains the signal processing and communications electronics

An infra-red 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 due to the angular arrangement and chamber baffles.
• When smoke enters the chamber, it scatters light from the IR LED onto the photo-diode in an amount related to the smoke characteristics and density.

The photo-diode signal is processed to provide an analogue value for transmission when the detector is interrogated.

Communication

Discovery uses a digital communications protocol developed from the XP95 protocol. It allows communication in three different modes:

• Normal Mode
• Read Mode
• Write Mode

This allows a more extensive exchange of information and commands than previous analogue addressable ranges. Discovery can also store data in non-volatile memory.

• Normal Mode is identical to the XP95 protocol, except that the five additional analogue value bits in the XP95 protocol extension have been re-defined so the fire control panel can distinguish between Discovery and XP95 devices.

• Read Mode is used to check information stored in the non-volatile memory of each detector. It is accessed by extending the Normal mode communication method from the fire control panel to the detector.

• Write Mode allows the fire control panel 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 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, refer to the fire control panel manufacturer’s operating instructions.

Product Specification
Specifications are given at 23°C and 50% relative humidity unless stated otherwise.

Product Code:	58000-600
Detection Principle:	Photo-electric detection of light scattered in a forward direction by smoke particles
Chamber configuration:	Horizontal optical bench housing infra-red emitter and sensor, arranged radially to detect forward scattered light
Sensor:	Silicon PIN photo-diode
Emitter:	GaAlAs infra-red light emitting diode
Sampling frequency	1 per second
Supply wiring:	Two-wire supply, polarity insensitive
Terminal Functions:	L1 & L2: Supply in and out connections – +R: Remote indicator positive connection (Internal 2.2kΩ resistance to positive)  – -R: Remote indicator negative connection (internal 2.2kΩ resistance to negative)
Operating Voltage:	17-28V DC
Communication protocol:	Apollo Discovery 5-9V peak to peak
Quiescent Current:	300µA
Power-up surge current:	1mA
Maximum power-up time:	10 seconds
Remote output characteristics:	Connects to positive line through 4.5kΩ (5mA maximum)
Clean-air analogue value:	23 +4/-0
Alarm level analogue value:	55
Alarm indicator:	2 colourless Light Emitting Diodes (LEDs);  illuminating red in alarm. Optional remote LED
Temperature Range:	-40°C to +70°C
Humidity:	0 to 95% relative ( No condensation or icing)
Effect of atmospheric pressure:	None
Effect of wind:	None
Vibration, Impact & Shock:	To EN54-7:2000
IP Rating:	44 in accordance with BSEN60529
Dimensions (D x H):	100 x 42mm, 100 x 50mm (Height in Base)
Weight:	Detector: 105g Detector In Base: 160g
Materials:	Housing: White polycarbonate V-0 rated to UL94 – Terminals: Nickel plated stainless steel