ATO smoke detection sensor is equipped with a high-precision probe, with an accuracy of ±5% FS, and can stably detect smoke concentrations in the range of 0~10000ppm. It comes with a waterproof rubber strip and a high-density waterproof casing, supporting operation in environments with temperatures ranging from -20~50℃ and humidity ranging from 15~90% RH without condensation. Gas sensor with probe is equipped with multiple protections such as lightning protection and surge protection, and has high repeatability and stability. Its data transmission is fast and reliable, making it a reliable choice for smoke monitoring in industrial, household and other scenarios.
Specification
| Model |
ATO-SN3002-SMK |
| Power Supply |
10~30V DC |
| Output Signal |
RS485 / 4~20mA / 0~5V / 0~10V |
| Power Consumption |
0.9W |
| Operating Temperature |
-20~50°C |
| Operating Humidity |
15~90%RH No Condensation |
| Pressure Range |
90~110KPa |
| Stability |
≤2% Signal Value/Month |
| Smoke Zero Drift (-20~40°C) |
±3%FS |
| Repeatability |
≤2% |
| Service Life |
≥12 Months |
| Measurement Range |
0~2000ppm, 0~10000ppm |
| Accuracy |
±5%FS (at C3H8,2000ppm, 25°C, 50%RH) |
| Resolution |
1ppm |
| Response Time |
≤35S |
| Preheating Time |
≥24H |
| Weight |
300g |
| RS485 Wiring Method |
Brown: Positive power supply Black: Negative power supply Yellow: 485-A Blue: 485-B |
| Analog Signal Wiring Method |
Brown: Positive power supply Black: Negative power supply Blue: Positive smoke signal Black: Negative smoke signal |
Notes:
- RS485: 10~30V wide-voltage input; do not reverse 485 A/B lines, and avoid address conflicts among multi-device bus.
- Analog Signal: 10~30V wide-voltage DC input; 0-10V output devices require 24V power supply only.
Features
- Waterproof tape: Equipped with internal waterproof tape, delivering excellent moisture-proof performance.
- High-density housing: Smoke gas sensor made of high-density materials; the waterproof shell enables reliable operation in rainy/snowy environments.
- Multiple protection: Integrated with lightning, surge and miswiring protection; proven stable via years of project applications.
- High-precision probe: Gas sensor with probe built-in high-precision probe for more sensitive and accurate detection.
Dimension

Application

Tips: What is Working Principle of Smoke Gas Sensor with Probe?
Smoke gas sensor with probe features tin dioxide (SnO₂) as the core semiconductor material: In clean air, the material exhibits low conductivity; when smoke particles enter the sensor, they react with the semiconductor surface, changing its carrier concentration and causing conductivity to increase with rising smoke density. The sensor converts this electrical signal variation into readable detection data, enabling smoke concentration monitoring.
With fast response (≤ 35S), high accuracy (± 5%FS), and reliable waterproof & multi-protection design, ATO smoke detector is the ideal safety solution for homes, workshops, chemical plants, and other scenarios. Come and choose our high-performance semiconductor smoke sensors for comprehensive safety protection!