Product Description
The ANWETECH AT-S211 is a 4-wire photoelectric smoke detector designed for early smoke detection and alarm output in fire alarm applications. It uses infrared light scattering technology with a dedicated sensing chamber to detect smoke from smoldering fires and output an alarm signal when the preset threshold is reached.
Compared with the 2-wire version, the AT-S211 provides relay-based alarm output, making it suitable for systems requiring switching output for fire alarm panels, control systems or external interfaces. The relay output is selectable as NO or NC, giving more flexibility for engineering design and integration.
The detector also features SMT design, wide voltage input, strong environmental adaptability, 360-degree LED indication and improved reliability. It is suitable for houses, hotels, banks, markets, factories and warehouses where a 4-wire smoke detector with relay output is required.
Key Features
Technical Specifications
Operating voltage: DC9V–35V
Standby current: 2 mA (24V NO) / 13 mA (24V NC)
Alarm current: 18 mA (24V NO) / 6 mA (24V NC)
Alarm indication: Red LED ON
Temperature range: -10°C to +50°C
Humidity: 0%–95% RH (non-condensing)
Alarm output: Relay output
Contact rating: 100 mA @ DC28V
Sensitivity: 0.5 dB/m (±0.1 dB/m)
Standard: EN54-7 / UL268
Dimensions: 103 mm diameter × 53 mm deep
Connection Description
Base terminals 1 and 2: DC power input
Terminal 3: relay output COM
Terminal 4: relay output (NO / NC)
Applications
