Milesight GS301 LoRaWAN Bathroom Odor Detector

<h2>Milesight GS301 LoRaWAN Bathroom Odor Detector</h2>

<p>The Milesight GS301 is a LoRaWAN bathroom odour detector designed to monitor ammonia (NH₃) and hydrogen sulphide (H₂S) concentrations in real time, helping facilities respond to deteriorating air conditions in washrooms and similar spaces. Its four-in-one sensing platform also measures temperature and humidity, while configurable alarms, a built-in buzzer, status indicator and Milesight D2D connectivity support automated ventilation and smart facility-management applications.</p>

<h3>Key Features</h3>

<ul>
<li>
<strong>Four-in-one environmental monitoring:</strong> Measures ammonia, hydrogen sulphide, temperature and relative humidity from a single compact device.</li>
<li>
<strong>Ammonia detection:</strong> Solid polymer electrochemical sensing measures NH₃ concentrations from 0 to 10 ppm with 0.01 ppm resolution.</li>
<li>
<strong>Hydrogen sulphide detection:</strong> Measures Hâ‚‚S concentrations from 0 to 5 ppm with a fine 0.001 ppm resolution.</li>
<li>
<strong>Configurable threshold alarms:</strong> High gas concentrations can trigger the integrated status indicator, buzzer and LoRaWAN uplink to help staff respond to changing conditions.</li>
<li>
<strong>Milesight D2D:</strong> Enables direct low-latency communication with compatible Milesight devices for applications such as automatic ventilation control without relying on a gateway for the D2D control path.</li>
<li>
<strong>LoRaWAN connectivity:</strong> Provides long-range, low-power wireless communication with compatible LoRaWAN gateways and network servers.</li>
<li>
<strong>Multi-year battery operation:</strong> Four replaceable 4000 mAh Li-SOClâ‚‚ batteries provide around three years of operation under Milesight's specified test conditions.</li>
</ul>

<h3><img src="https://www.lockstok.com//ProductImages/Milesight/67339515-2117-4575-BE3B-55A83CB8D401_424861.jpg?1787237391022"></h3>

<h3>Four-in-One Bathroom Environment Monitoring</h3>

<p>The GS301 combines ammonia, hydrogen sulphide, temperature and humidity sensing in one device. Ammonia and hydrogen sulphide are common contributors to unpleasant washroom odours, allowing the sensor to provide measurable information that can support more responsive cleaning and ventilation strategies.</p>

<h3>Ammonia and Hydrogen Sulphide Detection</h3>

<p>Solid polymer electrochemical sensing provides a 0 to 10 ppm measurement range for ammonia and a 0 to 5 ppm range for hydrogen sulphide. Both gas sensors have a specified accuracy of ±5% FS between -40°C and 35°C, while resolutions of 0.01 ppm for NH₃ and 0.001 ppm for Hâ‚‚S support detailed concentration monitoring. Milesight recommends operating the gas sensors below 35°C.</p>

<h3>Threshold Alarms and Ventilation Control</h3>

<p>Customisable thresholds allow the GS301 to react when ammonia or hydrogen sulphide concentrations reach configured levels. Events can activate the built-in buzzer and status indicator while transmitting data through LoRaWAN. Milesight D2D can additionally communicate directly with compatible Milesight equipment with a response time below one second, supporting applications such as automated ventilation control.</p>

<h3>LoRaWAN Connectivity</h3>

<p>The GS301 is compatible with standard LoRaWAN gateways and network servers and supports OTAA and ABP activation in Class A mode. Milesight specifies transmission distances of up to 2 km in urban areas and up to 15 km in rural areas, although actual wireless range depends on buildings, interference, gateway placement and other deployment conditions. NFC provides convenient local configuration using the Milesight ToolBox mobile application.</p>

<h3>Technical Specifications</h3>

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<th width="38%"><font color="#ffffff" data-darkreader-inline-color="" style="--darkreader-inline-color: var(--darkreader-text-ffffff, #e8e6e3);">Specification</font></th>
<th><font color="#ffffff" data-darkreader-inline-color="" style="--darkreader-inline-color: var(--darkreader-text-ffffff, #e8e6e3);">Details</font></th>
</tr>
<tr bgcolor="#f2f2f2" data-darkreader-inline-bgcolor="" style="--darkreader-inline-bgcolor: var(--darkreader-background-f2f2f2, #1f2223);">
<td>Brand</td>
<td>Milesight</td>
</tr>
<tr>
<td>Model</td>
<td>GS301</td>
</tr>
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<td>Manufacturer Part Number</td>
<td>GS301</td>
</tr>
<tr>
<td>Product Type</td>
<td>LoRaWAN Bathroom Odor Detector</td>
</tr>
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<td>Sensors</td>
<td>Ammonia (NH₃), hydrogen sulphide (H₂S), temperature and relative humidity</td>
</tr>
<tr>
<td>NH₃ Detection Principle</td>
<td>Solid polymer electrochemical</td>
</tr>
<tr bgcolor="#f2f2f2" data-darkreader-inline-bgcolor="" style="--darkreader-inline-bgcolor: var(--darkreader-background-f2f2f2, #1f2223);">
<td>NH₃ Measurement Range</td>
<td>0 to 10 ppm</td>
</tr>
<tr>
<td>NH₃ Accuracy</td>
<td>±5% FS (-40°C to 35°C)</td>
</tr>
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<td>NH₃ Resolution</td>
<td>0.01 ppm</td>
</tr>
<tr>
<td>NH₃ Long-Term Stability</td>
<td>&lt;1% accuracy drift per month</td>
</tr>
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<td>Hâ‚‚S Detection Principle</td>
<td>Solid polymer electrochemical</td>
</tr>
<tr>
<td>Hâ‚‚S Measurement Range</td>
<td>0 to 5 ppm</td>
</tr>
<tr bgcolor="#f2f2f2" data-darkreader-inline-bgcolor="" style="--darkreader-inline-bgcolor: var(--darkreader-background-f2f2f2, #1f2223);">
<td>Hâ‚‚S Accuracy</td>
<td>±5% FS (-40°C to 35°C)</td>
</tr>
<tr>
<td>Hâ‚‚S Resolution</td>
<td>0.001 ppm</td>
</tr>
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<td>Hâ‚‚S Long-Term Stability</td>
<td>&lt;1% accuracy drift per month</td>
</tr>
<tr>
<td>Temperature Range</td>
<td>-40°C to 85°C</td>
</tr>
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<td>Temperature Accuracy</td>
<td>±0.2°C</td>
</tr>
<tr>
<td>Temperature Resolution</td>
<td>0.1°C</td>
</tr>
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<td>Humidity Range</td>
<td>0% to 100% RH</td>
</tr>
<tr>
<td>Humidity Accuracy</td>
<td>±2% RH</td>
</tr>
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<td>Humidity Resolution</td>
<td>0.5% RH</td>
</tr>
<tr>
<td>Wireless Protocols</td>
<td>LoRaWAN and Milesight D2D</td>
</tr>
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<td>LoRaWAN Frequency Plans</td>
<td>CN470, IN865, RU864, EU868, US915, AU915, KR920 and AS923-1/2/3/4</td>
</tr>
<tr>
<td>LoRaWAN Activation</td>
<td>OTAA / ABP</td>
</tr>
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<td>LoRaWAN Device Class</td>
<td>Class A</td>
</tr>
<tr>
<td>Antenna</td>
<td>Internal</td>
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<td>Transmit Power</td>
<td>16 dBm at 868 MHz; 19 dBm at 470 MHz; 22 dBm at 915 MHz</td>
</tr>
<tr>
<td>Sensitivity</td>
<td>-137 dBm</td>
</tr>
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<td>Specified LoRaWAN Range</td>
<td>Up to 2 km in urban areas / 15 km in rural areas, subject to deployment conditions</td>
</tr>
<tr>
<td>Milesight D2D Response Time</td>
<td>Less than 1 second</td>
</tr>
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<td>Alarm</td>
<td>1 × status/alarm indicator and 1 × buzzer</td>
</tr>
<tr>
<td>Threshold Alarm</td>
<td>Supported; configurable</td>
</tr>
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<td>Button</td>
<td>1 × external reset/reboot button</td>
</tr>
<tr>
<td>Configuration</td>
<td>Mobile application via NFC</td>
</tr>
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<td>Power Supply</td>
<td>4 × 4000 mAh ER18505 Li-SOClâ‚‚ replaceable batteries</td>
</tr>
<tr>
<td>Specified Battery Life</td>
<td>Around 3 years at a 10-minute interval and 25°C</td>
</tr>
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<td>Sensor Life</td>
<td>More than 3 years</td>
</tr>
<tr>
<td>Operating Temperature</td>
<td>-40°C to 55°C</td>
</tr>
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<td>Operating Humidity</td>
<td>0% to 95% RH, non-condensing</td>
</tr>
<tr>
<td>Ingress Protection</td>
<td>IP30</td>
</tr>
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<td>Housing Material</td>
<td>Flame-retardant PC + ABS</td>
</tr>
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<td>Colour</td>
<td>White</td>
</tr>
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<td>Installation</td>
<td>Wall screw mounting</td>
</tr>
<tr>
<td>Dimensions</td>
<td>120 × 85 × 32.5 mm</td>
</tr>
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<td>Weight</td>
<td>221.4 g including batteries</td>
</tr>
<tr>
<td>Regulatory Approvals</td>
<td>CE, FCC</td>
</tr>
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<td>Safety Standard</td>
<td>EN 62368-1</td>
</tr>
<tr>
<td>Environmental Compliance</td>
<td>RoHS</td>
</tr>
</tbody>
</table>

<p>Improve washroom environmental monitoring with real-time ammonia, hydrogen sulphide, temperature and humidity sensing, and add the Milesight GS301 to your smart facility-management system today.</p>