Milesight GS301 - Bathroom Odor Detector
Milesight GS301 - Bathroom Odor Detector
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The Milesight GS301-868M is a 4-in-1 LoRaWAN® bathroom odor detector that measures ammonia (NH₃, 0–10 ppm) and hydrogen sulfide (H₂S, 0–5 ppm) with solid-polymer electrochemical sensors, alongside built-in temperature and humidity. When a configured gas threshold is reached, its LED indicator and buzzer prompt ventilation.
Data and alarms are reported over LoRaWAN® Class A, and Milesight D2D lets it act as a controller for gateway-less ventilation control. Powered by four replaceable Li-SOCl₂ batteries (~3-year life) in a flame-retardant IP30 enclosure with a damp-proof coating; configured via NFC.
Before you install
- Setup: via the Milesight ToolBox app (NFC).
- Power: 4× lithium batteries (ER18505), ~3-year life.
- Alerts: above the threshold it triggers a local LED and buzzer; reports via a LoRaWAN gateway (sold separately) or directly via Milesight D2D.
Parameters
| Wireless Protocol | LoRaWAN®, Class A (OTAA/ABP), Milesight D2D support |
| Frequency | EU868, max. 16 dBm |
| Gas Detection | NH₃ 0–10 ppm (res 0.01 ppm), H₂S 0–5 ppm (res 0.001 ppm), accuracy ±5 % FS; electrochemical |
| Temperature | –40 °C to +85 °C, accuracy ±0.2 °C, resolution 0.1 °C |
| Humidity | 0–100 % RH, accuracy ±2 % (@25 °C), resolution 0.5 % RH |
| Detection | LED indicator + buzzer threshold alarm |
| Configuration | NFC via Mobile App, Downlink |
| Battery | 4 × 4000 mAh Li-SOCl₂ (ER18505), ~3 years |
| Enclosure | PC+ABS (flame retardant), IP30, damp-proof coating |
| Dimensions | 120 × 85 × 32.5 mm |
| Mounting | Wall screw |
| Certifications | CE, FCC, RoHS |

