59000-605

Оптический детектор дыма, XPlorer 59000-605

Operating Principles

The XPlorer optical detector has a moulded selfextinguishing white polycarbonate case designed to allow free entry of smoke while minimising the effects of dust contamination. Stainless steel wiper contacts connect the detector to the terminals in the mounting base. Within the case is a printed circuit board which on one side has the light proof labyrinth chamber with integral gauze surrounding the optical measuring system. The other side has the address capture, signal processing and communications electronics.
An infra-red light emitting diode (IR LED) within the optical chamber is arranged at an obtuse angle to a photodiode. 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.
When smoke enters the chamber it scatters light from the IR LED onto the photodiode in an amount related to the smoke characteristics and density. The photodiode 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.

Electrical Description

The 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 in the mounting base. Connection is polarity sensitive. (Figs 1a & 1b).
A remote LED driver base is also available. In addition to the supply terminals a connection for a remote LED is provided. The remote LED is connected between the positive supply line of the base and the remote negative terminal. The negative connection incorporates a 4k3 limiting resistor to protect the loop from accidental short circuit remote wiring. The LED current should be limited to 4mA.
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 A/D converter in 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. Whenever the device is interrogated this data is sent to the control equipment.
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 calibrated alarm threshold.

Environmental Characteristics

The XPlorer optical smoke detector is unaffected by wind or atmospheric pressure and operates over the temperature range –20°C to +60°C.

ТЕХНИЧЕСКИЕ ХАРАКТЕРИСТИКИ

Address Range:	1–63 (6 bits)
Detector Type:	Products of combustion (smoke)
Detection Principle:	Photo-electric detection of light scattered in a forward direction by smoke particles
Chamber Configuration:	Horizontal optical bench housing an infrared 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 second
Supply Wiring:	Two wire supply, polarity sensitive
Detector Terminal Functions:	Supply positive and negative in and out connections (polarity sensitive). Remote indicator connection to LED driver base
Supply Voltage:	17 to 28 Volts dc
Quiescent Current:	340μA
Duration of Power-up Surge Current:	1 second
Maximum Power-up Time:	(measured from application of power and protocol) 4 seconds for communications 10 seconds to exceed 10 counts 35 seconds for stable clean air value
Storage Temperature:	-30°C to +80°C
Operating Temperature: (No condensation or icing)	-20°C to +60°C
Clean Air Analogue Value:	25±7 counts
Alarm Level:	55 counts
Alarm Indicator:	Red Light Emitting Diode (LED)
Alarm LED Current:	2mA
Remote LED Base Connection:	4.3kΩ connected to negative line
Type Code:	(210 43) 101 00
Sensitivity:	Nominal threshold of 2.4% light grey smoke obscuration per metre
Humidity: (No condensation)	0% to 95% relative humidity
Wind Speed:	Unaffected by wind
Atmospheric Pressure:	Insensitive to atmospheric pressure
Vibration, Impact & Shock:	To EN54–7:2000
IP Rating:	43
Dimensions: (diameter x height)	Detector: 100mm x 39mm Detector in Base: 100mm x 47 mm
Weights:	Detector: 100g Detector in Base: 157g
Materials:	Detector Housing: White polycarbonate V-0 rated to UL 94 Terminals: Stainless Steel