| 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 |
TR