The ANWETECH AT-S235 is a battery-powered LoRaWAN® photoelectric smoke detector designed for wireless fire monitoring in indoor applications.
It combines local audible and visual fire warning with LoRaWAN wireless alarm transmission, allowing smoke, high-temperature and low-battery events to be transmitted through a compatible LoRaWAN gateway to a server or monitoring platform.
With no external signal or power wiring required, AT-S235 is suitable for retrofit projects, existing buildings and distributed fire monitoring applications where conventional cabling is difficult or undesirable.
The AT-S235 LoRaWAN Smoke Detector uses photoelectric sensing technology to monitor smoke generated during developing fire conditions.
When smoke reaches the alarm threshold, the detector activates its built-in red LED and buzzer while transmitting the alarm event through the LoRaWAN network.
The detector also supports high-temperature alarm, low-battery alarm, self-test and alarm silence functions, providing both local warning and remote status monitoring.
A built-in LoRaWAN wireless communication module eliminates normal fire alarm signal cabling between the detector and gateway. The device is powered by one CR17450 battery and is designed for low-power operation.
Typical system architecture:
AT-S235 Detector → LoRaWAN Gateway → Network Server / Cloud → Monitoring Platform
This allows multiple distributed detectors to be centrally supervised from a compatible monitoring system.
AT-S235 communicates through a standard LoRaWAN wireless network. Alarm and status information can be transmitted to a compatible LoRaWAN gateway and subsequently forwarded to a server or monitoring platform.
The detector uses photoelectric smoke detection technology for early warning of developing fire conditions.
A built-in red LED and buzzer provide local alarm notification when a smoke alarm is detected.
In addition to smoke monitoring, the device supports high-temperature alarm reporting.
Battery status is monitored automatically. When the battery voltage falls below the defined low-voltage threshold, the detector provides a local indication and reports the condition.
The detector includes a local test button for routine functional verification.
During an alarm, the local buzzer can be temporarily silenced using the detector button. If the alarm condition remains after the silence period, the alarm can restart.
The detector operates from one CR17450 battery, eliminating the need for external operating-power cabling.
| Parameter | Specification |
|---|---|
| Model | AT-S235 |
| Product Type | LoRaWAN® Wireless Photoelectric Smoke Detector |
| Detection Principle | Photoelectric smoke detection |
| LED | 1 × Red LED |
| Buzzer | 1 × Integrated buzzer |
| Button | 1 × Self-test / silence button |
| Effective Range | 60 m³ |
| Alarm Sound Pressure | ≥80 dB at 3 m directly in front |
| Alarm Delay | <12 seconds |
| Alarm Method | Audible and visual alarm |
| Communication Protocol | Standard LoRaWAN® 1.0.3 |
| Standard Frequency | EU868 |
| Optional Frequency Bands | CN470 / IN865 / US915 / AU915 / AS923 |
| Transmission Power | 14 dBm; up to 22 dBm maximum |
| Receiver Sensitivity | -125 dBm @ SF=12 |
| Network / Operating Mode | OTAA Class A |
| Configuration Method | Server configuration |
| Alarm Functions | Smoke alarm / low-battery alarm / high-temperature alarm |
| Power Supply | 1 × CR17450 battery, 2400 mAh |
| Battery Life | >3 years at 3 data reports/day under laboratory conditions |
| Operating Temperature | -10°C to +50°C |
| Operating Humidity | ≤90% RH, non-condensing |
| Dimensions | 102 × 102 × 51 mm |
| Installation Method | Screw-fixed ceiling installation |
| Recommended Environment | Indoor installation without obstruction |
These technical values follow the internally consistent LoRaWAN product datasheet corresponding to the original SD-300 product data.
Effective range: 60 m³
Actual detector quantity and installation spacing should be determined according to the applicable local fire alarm design requirements, ceiling geometry, airflow and site conditions.
Alarm delay: <12 seconds
Sound pressure: ≥80 dB measured at 3 m directly in front of the detector.
The source product documentation states a wireless communication distance of up to approximately 3 km in an open environment.
Actual communication distance depends on:
For indoor projects, actual LoRaWAN coverage should therefore be verified during commissioning.
The AT-S235 is a wireless detector and does not require conventional fire alarm signal wiring for normal LoRaWAN communication.
Typical communication path:
AT-S235 Smoke Detector
↓ LoRaWAN Wireless
LoRaWAN Gateway
↓ Internet / Network
Cloud or Network Server
↓
PC / Web / Monitoring Platform
The detector must use the same compatible LoRaWAN regional frequency configuration as the selected gateway.
AT-S235 does not directly require a traditional fire alarm control panel for LoRaWAN data transmission. Remote monitoring is performed through the gateway and associated server or platform.
The detector is designed primarily for indoor ceiling installation.
Recommended installation considerations include:
AT-S235 is especially suitable for applications where wireless installation, distributed monitoring or reduced cabling is required, including:
The source documentation specifically identifies office, living and residential indoor areas as typical applications.
