Dahua HY-SA20A – Standalone Smoke Alarm, Photoelectric Sensor, 85 dB, Coverage up to 40 m²

The Dahua HY-SA20A is a standalone smoke alarm designed for continuous monitoring of smoke concentration in indoor environments. The device operates fully autonomously — it requires no connection to a control panel or external security system — enabling straightforward ceiling installation without complex wiring. Thanks to split-spectrum sensor technology, the device detects smoke particles rapidly while maintaining a low false alarm rate. Once the alarm threshold is reached, a high-volume audible and visual alert is triggered to warn occupants of a potential fire hazard.

Key features

• Sensor type: Photoelectric with split-spectrum technology for accurate detection and low false alarm rate
• Alarm volume: >85 dB(A) at 3 m
• Alarm mode: Audible and visual alarm (red LED)
• Alarm types: Smoke detection, device fault, low battery warning
• Alarm response threshold: 0.2–0.3 dB/m
• Sampling period: 9 seconds
• Coverage area: 20–40 m² (for ceiling heights up to 8 m)
• LED indicators: Standby – green LED flashes once per minute; alarm – red LED flashes once per second; fault / low battery – red LED flashes once per minute
• Silencing function: Yes – test and hush via a single button
• Power source: 3 V CR123A lithium battery (replaceable, included)
• Battery life: Up to 10 years
• Operating current: Monitoring ≤ 15 µA; alarm ≤ 35 mA
• Operating temperature: –10 °C to +55 °C
• Relative humidity: ≤ 95% RH (non-condensing)
• Casing: ABS plastic, white
• Dimensions: Ø98 mm × H43.1 mm
• Weight: 136 g
• Installation: Ceiling surface mount
• Certifications: TÜV, CE; compliant with EN 14604:2005+AC:2008

Suitable for residential and commercial indoor use including apartments, villas, dormitories, living rooms, bedrooms, hallways and offices. Not suitable for outdoor use or rooms with a ceiling height exceeding 8 m.