Modern automation technologies are rapidly developing, and one of the key issues remains ensuring the reliability and durability of equipment installed in automation cabinets. For this, specialized devices are used.
One of them is the iSN-811C-MTCP infrared temperature measurement module with Ethernet and PoE support, designed for non-contact monitoring. The device integrates thermal and visible image data, providing visual information on temperature distribution in real time.
Control cabinet devices: additional protection and optimization
Automation requires reliable protection of equipment from environmental influence. Control cabinets protect devices from water, dust and temperature changes. However, even inside the cabinet, it is important to consider possible problems, such as excessive heat or low temperatures. Overheating can cause failures, and cold contributes to the formation of condensation, which increases the risk of damage.
The solution is to maintain an optimal temperature inside the cabinet using heating, ventilation or cooling systems. This ensures reliable operation of the equipment in any conditions.
However, even inside the cabinet, conditions unfavorable for the operation of the equipment can arise. One of the main problems is excessive heat. Overheating is a common cause of breakdowns of various devices. On the other hand, low temperatures are also dangerous. Firstly, significant frosts can disable the equipment, especially if it is used in unheated rooms or outside in winter. To prevent this, it is important to provide heating systems inside the cabinet. Secondly, cold contributes to the formation of condensation, which is an additional risk. To avoid this problem, the temperature in the cabinet must be maintained above the dew point, thereby eliminating the possibility of condensation forming on the internal walls.
Key functionality of the iSN-811C-MTCP
- Contactless temperature measurement.
- Support for Modbus TCP, RESTful API and MQTT protocols for easy integration into SCADA and IoT systems.
- Web interface for configuration, monitoring and analysis.
- Support for temperature threshold function for deviation alerts.
Configuration using the iSN-8xx_Tool Utility
- iSN-8xx_Tool Utility includes the following components:
- LiveList.exe — scanning devices, displaying maximum, minimum, average temperature and diagnostics.
- IR_Configuration.exe — configuring communication parameters, displaying a heat map, setting thresholds, exporting and recording data.
Main parts of the web interface for module configuring
- «Settings» page — IP address configuration, Modbus TCP, RESTful and MQTT protocols.
- Modbus TCP. In this mode, the module acts as a server and receives incoming requests from the Modbus TCP client. The register map is provided in the module manual

- MQTT works in client mode, supports broker URI configuration, QoS levels, message sending interval, Last Will and authorization

- RESTful API. The module connects to a remote site and sends data in JSON format

- Sensor — emission, offset and threshold settings for each region.
- HeatMap — visualization of thermal data, customization of transparency, grid and color palette.

- Chart — temperature trend charts with CSV export option.
- Calibration — sensitivity calibration and measurement area calculation. This is done after the sensor is installed, since each cabinet may have a different distance from the camera to the measurement object, as well as different conditions (temperature, humidity, equipment materials).
Distance calculating. Since the module measures temperature based on radiated heat, the distance between the camera and the object affects the accuracy of the measurements. The further the object is, the weaker the signal becomes, and this can affect the temperature calculation. Calibration allows you to take this distance into account and adjust the measurement results to avoid errors..
Emission coefficient. There is also an emission coefficient in calibration: different materials have different radiation coefficients (emissions), and this affects the accuracy of temperature measurement. For example, metal and plastic reflect heat differently. Accordingly, setting the emission coefficient via the web interface or utility allows the camera to correctly interpret the thermal radiation data.
Temperature drift correction. The camera may show slight variations in temperature measurements due to manufacturing tolerances, changes in environmental conditions (humidity, ambient temperature) or other factors. Calibration eliminates these variations, allowing you to obtain more accurate data.
Measurement zone registration. Depending on the distance, the area covered by the sensor changes. Calibration helps to correctly calculate the length along the X and Y axes depending on the distance to the object.
Extended functionality
- Temperature points and their coordinates — the ability to select a specific location for displaying the temperature. This function allows you to determine the temperature at a specific point in the measurement area. For devices with an infrared matrix, such as iSN-811C-MTCP, each point (pixel) in the matrix has unique coordinates within the field of measurement (FOV).
- Segmentation of FOV measurement area measurements — division of the measurement area into areas with independent parameters. The measurement area (FOV) is divided into several independent segments, each of which can be configured individually. This provides detailed temperature control in different areas. Each segment (group of pixels) has unique parameters: maximum, minimum and average temperature, threshold values (warning and alarm). In the iSN-811C-MTCP the matrix is divided into 4 segments (64/4 - 16 pixels in each), which simplifies temperature control in different parts of the measured area. It is used to control several zones of one object, for example, in different parts of the engine or some surface.
- Temperature threshold value — Setting and managing thresholds for warnings and alarms. Has two parameters:
- The warning threshold indicates that the temperature is approaching a critical level.
- The danger threshold signals that the temperature exceeds the acceptable value.
Can be used to automatically shut down equipment installed in the cabinet when overheating or notifying the operator to prevent accidents.
- Diagnostic messages — displaying messages about module status or threshold exceeding. Message types:
- System errors, for example, sensor error, inability to read data.
- Threshold settings errors, if the specified threshold values conflict or are outside the acceptable range.
- Alerts on exceeding thresholds:
- Temperature above warning threshold.
- Temperature above danger threshold.

Mounting methods
- Standard option is DIN-rail mounting

- Additional mounting kits with universal joint or magnets
Mounting accessories:
ASO-0054 – bracket with hinge
ASO-0060 – bracket with hinge
WM01-M – DIN-rail with magnet
IR temperature sensor product comparison chart
Model name |
Measurement range |
Pixels |
FOV |
Protocol |
Camera |
-20℃ ~ 250℃ |
64 (8 * 8) |
60° * 60° |
Modbus TCP |
QVGA (320 x 240) |
|
-40℃ ~ 300℃ |
768(32 * 24) |
110° * 75° |
Modbus RTU |
- |
|
Modbus TCP |