MN-NVOC PoE 4-in-1 Air Quality Monitor | Industrial Multi-Protocol IoT Sensor
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Origin: China | HS Code: 8517.62.3990
The MONIGEAR MN-NVOC PoE 4-in-1 Air Quality Monitor is engineered for continuous, long-term environmental monitoring in professional settings. Our PoE-powered solution delivers uninterrupted 24/7 monitoring for industrial IoT and SCADA applications.
Key Features
- 4-in-1 Environmental Monitor (TVOC, CO₂,Temperature,Humidity). High accuracy:Temperature measurement accuracy: ± 0.3° C; Humidity measurement accuracy: ±3%;CO₂ measuring accuracy: ±(50ppm + 5% of reading).
- Supports Multiple Industry-Standard Communication Protocols: Modbus TCP, SNMP, BACnet, and MQTT. Our system is compatible with all these protocols and can deliver data in multiple formats simultaneously. Comprehensive support for SNMP v1/v2/v3 and SNMP Trap v2c/v3 with high security level.
- A web service can be enabled to view sensor data directly through a browser. Support for the REST API protocol can also be enabled to return JSON data from the sensors. However, these two features are disabled by default for network security reasons, and can be enabled by configuration tool.
- Advanced SNMP Support: Full compatibility with SNMP v1/v2/v3 and SNMP Trap v2c/v3, featuring enterprise-level security for critical infrastructure monitoring.
- Can be integrated to AWS/Azure/Tuya loT cloud directly with low cost. Can be directly integrated into Home Assistant
- Proactive Alerts – Instant email notifications when thresholds are exceeded (fully customizable triggers). IFTTT Automation – Trigger smart actions (e.g., activate HVAC, log to Google Sheets, or Telegram alerts) via Webhook integration.
- PoE power supply: Centralized power supply: Simply provide uninterrupted power supply at the PoE switch to ensure power supply to the sensor.
- Easy to use: A graphical interface configuration tool supporting Windows, Linux, and macOS platforms with online remote upgrade capability for simplified product deployment and maintenance.
- Sleek, Durable Design: Compatible with standard 86×86 junction boxes, featuring a flame-retardant PC housing that meets stringent safety standards while complementing modern building aesthetics.
- Professional Certification: Certified through FCC/CE-EMC/ROHS, meeting the high standards and strict requirements of the market.
- Your Data, Your Control: MONIGEAR's sensor puts security first—whether cloud-connected or fully self-contained
Typical Scenarios
For detailed information about the capabilities across all our Network Sensors, please visit our common features page.
Technical Specifications
| Measurement Range | Temperature: -30°C~85°C (-22°F~185°F); Humidity: 0-100% RH; Carbon dioxide concentration: 400ppm–2000ppm; TVOC: 0-10,000 ppb |
|---|---|
| Measurement Accuracy | Temperature: ±0.3°C @0-65°C (±0.54°F @32-149°F); Humidity: ±3%@10-90% RH; Carbon dioxide: ±(50ppm+5% of reading); TVOC: typical error of <12% of the measured value |
| Communication Protocol | Supports multiple TCP/IP application layer protocols: MQTT/MQTTS, ModbusTCP, SNMP, BACnet, REST API, email etc. |
| Power Supply | POE Power: Compatible with IEEE 802.3at standard. Power supply can be customized to DC 5V or DC 12V on request. |
| Power Consumption | 0.5W |
| Operating Storage Temperature | -30~+85℃ (-22°F~185°F) |
| Operating Storage Humidity | 5~95% RH, non-condensing |
| Product Dimensions | 86*86*48 mm |
Frequently Asked Questions
What types of volatile organic compounds (VOCs) can the MN-NVOC detect?
The MN-NVOC is equipped with a high-sensitivity Metal-Oxide-Semiconductor (MOS) sensor that provides broad-spectrum response to a wide range of volatile organic compounds commonly found in indoor environments, including alcohols, benzene derivatives (aromatics), ketones, aldehydes, hydrogen, and certain oxidizing gases.
The device continuously monitors gas molecules released from the following pollution sources and calculates a Total Volatile Organic Compound (TVOC) concentration value to provide a comprehensive air quality assessment:
- Alcohols: Such as ethanol, commonly found in alcoholic beverages, disinfectants, and some personal care products;
- Aromatics (benzene series): Such as toluene, commonly found in paints, coatings, adhesives, and new furniture;
- Ketones: Such as acetone, commonly found in nail polish removers and degreasing cleaners;
- Other VOCs: Including cooking fumes, perfume sprays, and various organic gases emitted from household products.
Note: The MN-NVOC monitors and outputs the total concentration of the above gases as a single TVOC value — a composite indicator of overall pollution levels. It does not differentiate between individual gas species or provide separate concentration readings for specific gases.
After initial installation, the readings seem consistently low. Is the sensor accurate?
Low initial readings are normal and result from the combined effects of the sensor's physical adaptation and automatic calibration logic:
1. Physical environment adaptation: When the sensor is first removed from its packaging, it transitions from a high-VOC environment (caused by outgassing from packaging materials) to the actual indoor air. The gas-sensitive material on the sensor surface undergoes a desorption and re-equilibration process, during which readings gradually adjust until the sensor stabilizes with the ambient environment.
2. Automatic Baseline Correction (ABC) algorithm: Upon power-on, the sensor runs an Automatic Baseline Correction algorithm that typically requires 24 hours of continuous operation. During this calibration phase, the algorithm learns and establishes a baseline for the environmental background concentration. In the first few hours after power-on, because there is no historical minimum value as a reference (or the reference has not yet converged), the algorithm applies filtering to the raw data before the baseline is locked, which can result in lower initial readings.
Note: Although absolute values may read low during the calibration period, the sensor responds to relative changes in gas concentration in real time. If you open a window for ventilation or bring a volatile aerosol source (such as alcohol or perfume) near the sensor, you will still observe significant value fluctuations. After the 24-hour calibration period, the device locks its baseline and provides accurate air quality data.
Is DIN rail mounting available?
The mounting accessories included with standard shipments are designed for wall mounting. However, DIN rail mounting is possible using custom mounting adapters similar to the ones shown in the gallery, which attach the device to a standard DIN rail with simple modification. This is considered a custom mounting solution. If you require DIN rail mounting, please contact us — we can provide customized accessories and supply arrangements to meet your installation needs.
When I exhale directly onto the sensor, why doesn't the CO2 reading change much?
The 4-in-1 MN-NVOC has three sensing elements: one for temperature/humidity and one for TVOC, both located in the external probe head. However, the CO2 sensor is positioned at the inner edge of the device housing — the area marked by the red outline in the adjacent image. To observe a clear CO2 response from breath testing, exhale toward this specific position on the device rather than directly at the external probe.
