MN-NENS PoE Temperature Monitor | Industrial Multi-Protocol IoT Sensor
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Origin: China | HS Code: 8517.62.3990
About This Variant
MN-NENS-TS: Temperature monitor with ultra-thin temperature probe (MNAC-TS) featuring 1mm diameter cable, perfect for minimizing cold air leakage in refrigerator/freezer applications.
Upgrade your temperature monitoring with MONIGEAR’s professional temperature sensors. Engineered for versatile deployment, they deliver precise, real-time readings for water tanks, ventilation ducts, refrigerators and freezers. Our ultra-thin probe cables are specially designed to minimize cold air leakage, making them ideal for cold storage equipment. Built for dependable performance and easy integration, they suit a wide range of industrial and commercial temperature measurement needs.
Key Features
- Industrial-Grade Connectivity: Seamlessly integrates with MQTT, BACnet, SNMP, and Modbus TCP protocols, ensuring compatibility with existing building management systems and IoT platforms.
- 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.
- Flexible Cloud or Local Operation: Sync with AWS/Azure/Tuya IoT cloud services or operate independently with your local server (e.g., Home Assistant), giving you complete control over your data.
- Advanced SNMP Support: Full compatibility with SNMP v1/v2/v3 and SNMP Trap v2c/v3, featuring enterprise-level security for critical infrastructure monitoring.
- Intelligent Alerts: Receive instant email notifications and leverage IFTTT integration to automate responses to environmental changes, keeping you informed and in control.
- PoE Power Efficiency: Simplify installation with Power over Ethernet (IEEE 802.3at compliant), eliminating the need for separate power cables and reducing maintenance complexity.
- High-Precision Sensing: Equipped with digital temperature sensors delivering industry-leading accuracy (Temperature: ±0.5°C), ensuring reliable environmental monitoring.
- User-Friendly Configuration: Intuitive graphical tool supports cross-platform operation, making setup and management accessible for both technical and non-technical users.
- 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.
Real-World Test Case: Refrigerator Temperature Monitoring
Below is a real-world test case of refrigerator temperature monitoring. Data collected by the device is uploaded in real time to our proprietary cloud platform built on AWS IoT. The system is currently under development and is expected to be officially available to customers in a few months.
The device adopts an open protocol architecture, enabling customers to seamlessly integrate monitoring hardware into their existing business systems.
The cloud platform generates full-day temperature trend charts for intuitive visualization, clearly displaying the refrigerator's normal low-temperature baseline, sharp temperature spikes triggered by door openings, and all abnormal temperature fluctuations.
Zooming into time-series curves of specific time windows reveals every sampled data point transmitted to the cloud, which directly verifies stable and reliable data transmission performance.
Additionally, the device implements an adaptive reporting logic: it sends data at a high frequency when temperature fluctuates drastically, and reduces transmission frequency when readings remain stable. This mechanism effectively cuts down data transmission and cloud storage overhead.
Technical Specifications
| Measurement Range | Temperature: -40°C~85°C (-40°F~185°F) |
|---|---|
| Measurement Accuracy | Temperature: ±0.5°C(±0.9°F) |
| Number of measurement channels | Up to 2 channels supported |
| Connection method between probe and main body | Wired |
| 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) |
| Product Dimensions | 86*86*48 mm |
Frequently Asked Questions
Do I have to use the thin-wire probe for refrigerator/freezer monitoring?
This depends on your accuracy requirements and the installation environment. We tested both probe types at the same position inside the same refrigerator and found that the two probes agree well at room temperature. However, when measuring inside the refrigerator (where the internal temperature is approximately 25°C lower than room temperature), the thick-wire probe consistently reads 4–5°C higher than the thin-wire probe over extended periods.
This discrepancy is caused by heat conduction along the thicker cable and the probe's own thermal mass, which pulls heat from the warmer ambient air into the cold measurement environment. For applications requiring high measurement accuracy, the thin-wire probe is recommended.
Note that the thin-wire probe is physically more delicate than the thick-wire version, so adequate cable protection should be planned during routing and installation.
How does the stainless-steel probe housing affect measurements?
To withstand harsh environments, the sensing element is encapsulated inside a small stainless-steel cylinder for mechanical protection. This encapsulation, however, introduces a small measurement trade-off: it increases the probe's effective thermal mass, which slows the response to rapid temperature changes and acts as a natural smoothing filter.
During door-open/door-close testing on a refrigerator, we compared the encapsulated probe against a bare (unencapsulated) sensor. The bare sensor showed a peak temperature rise approximately 2°C higher than the encapsulated probe when the door was opened, confirming that the steel housing slightly dampens transient temperature spikes while still accurately tracking steady-state temperatures.
What is the maximum cable length for the probe? Can the probe wire be extended?
Although the MN-NENS uses a digital temperature probe, cable length should generally be kept within 5 meters to avoid electromagnetic interference that could corrupt readings.
If longer cable runs are required, two measures must be taken:
- Use shielded cable: Replace the standard cable with a shielded twisted-pair or shielded cable suitable for digital signals;
- Ground the shield properly: The cable shield must be terminated to a good earth ground at one end.
With proper shielding and grounding, cable lengths of over ten meters can be achieved while maintaining data integrity.