GS301 – Indoor LoRaWAN NH₃/H₂S Gas Detector – Milesight
 General Description
 The Milesight GS301 is a compact industrial gas detector capable of monitoring ammonia (NH₃) and hydrogen sulfide (H₂S) concentrations in indoor air. It incorporates high-precision electrochemical sensors and offers reliable data transmission via LoRaWAN® and Milesight D2D. Equipped with a buzzer and LED indicator for local alerts, it provides real-time monitoring in industrial buildings, farms, or laboratories.
 Targeted Applications
-  Air quality monitoring in industrial areas
 
-  Gas leak detection in farms
 
-  Laboratories and research facilities
 
-  Water or waste treatment facilities
 
-  Technical rooms or maintenance areas
 
 Highlights
 - Precise electrochemical sensors for NH₃ and H₂S
 
-  Dual transmission technology: LoRaWAN® + D2D
 
-  Local signaling via buzzer and alert LED
 
-  Easy configuration by NFC via mobile application
 
-  3-year battery life with replaceable batteries
 
-  Extended operating temperature range (-40°C to +55°C)
 
-  Quick and easy wall installation
 
 Technical Specifications 
|  Wireless transmission | 
|  Protocols | 
 LoRaWAN®, Milesight D2D | 
|  Supported frequencies | 
 CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1/2/3/4 | 
|  Transmit power | 
 16 dBm (868 MHz) / 22 dBm (915 MHz) / 19 dBm (470 MHz) | 
|  Sensitivity | 
 -137 dBm | 
|  Fashion | 
 OTAA / ABP – Class A | 
|  Sensors | 
|  Ammonia (NH₃) | 
 0 ~ 10 ppm, ± 5%, resolution 0.01 ppm | 
|  Hydrogen sulfide (H₂S) | 
 0 ~ 5 ppm, ± 5%, resolution 0.001 ppm | 
|  Detection principle | 
 Solid polymer electrochemical | 
|  Long-term stability | 
 < 1% accuracy drift per month | 
|  Temperature | 
 -40 to +85°C, accuracy ± 0.2°C, resolution 0.1°C | 
|  Humidity | 
 0 ~ 100% RH, ± 2%, resolution 0.5% RH | 
|  Physical characteristics | 
|  Food | 
 4 × 4000 mAh ER18505 Li-SOCl₂ (replaceable) | 
|  Autonomy | 
 About 3 years (10 min interval) | 
|  Operating temperature | 
 -40°C to +55°C | 
|  Relative humidity | 
 0% to 95% (non-condensing) | 
|  Protection index | 
 IP30 | 
|  Dimensions | 
 120 × 85 × 32.5 mm | 
|  Material / Color | 
 Flame retardant PC+ABS, white | 
|  Facility | 
 Wall mounting | 
 Interfaces and Connectors
 The GS301 has an internal reset button, an audible (buzzer) and visual (LED) alert, and is configured via NFC with the Milesight ToolBox mobile app.
 Pack Contents
-  1 × Milesight GS301 Gas Detector
 
-  4 × ER18505 Li-SOCl₂ Batteries
 
-  1 × Wall mounting kit
 
-  1 × Quick Start Guide