Detection principle | Smoke: Photo-electric detection of light scattered 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 | GaAIAs infra-red light emitting diode |
Sampling frequency | Once per second |
Supply Wiring | Two wire supply, polarity insensitive |
Terminal functions |
L1 & L2 Supply in & out connections |
Quiescent current | 400 µA |
Operating voltage | 17 - 28 V dc |
Communication protocol | XP95 and Discovery compatible 5–9 V peak to peak |
Power-up surge current | 1 mA |
Maximum power-up time | 10 seconds |
Alarm current, LED illuminated | 3.5 mA |
Remote output characteristics | Connects to a positive line through 4.5 kΩ (5 mA maximum) |
Clean air analogue value | 23 +4/-0 |
Alarm level analogue value | 55 |
Alarm indicator | Two colourless LEDs, illuminated red in alarm. Optional remote LED |
Operating temperature | -40°C to 70°C |
Storage temperature | -40°C to 70°C |
Humidity | 0% to 95% RH (no condensation or icing) |
Effect of temperature on optical sensor | None |
Effect of wind speed on optical sensor | None |
Vibration, impact & shock | EN 54-7 |
IP Rating | designed to IP44 |
Standards & approvals | EN 54-7 and IEC61508-1,2 |
Dimensions | 100 mm, diameter x 42 mm height (50 mm with XPERT 7 base) |
Weight | 105 g detector 160 g detector with XPERT 7 base |
Materials | Housing: White flame-retardant polycarbonate Terminals: Nickel plated stainless steel |