Precise temperature measurement is now a central component of modern industrial and building technology. With the Wiesemann & Theis Web-Thermometer Relay, a reliable solution is available that combines temperature monitoring and automatic control at the highest technological level. This IoT temperature sensor system is specifically designed to capture precise temperature data in real time while simultaneously taking over switching functions for connected devices. Whether in data centers, industrial production plants, or technical building systems – the system enables intelligent, networked control based on current sensor data.

The Web-Thermometer offers a unique combination of precise measurement technology, a powerful relay switching output, and a user-friendly web interface. It measures temperatures ranging from -50 °C to +180 °C and supports measurements up to +650 °C via an optional sensor connection. This makes it suitable for both standard processes and high-temperature applications. Through the integrated digital relay output, devices or fans can be automatically activated as soon as predefined threshold values are exceeded. This automation function protects critical systems and significantly increases operational reliability.

The Web-Thermometer Relay from Wiesemann & Theis is fully network-capable and operates cloud-based. Temperature monitoring can be performed remotely via web access – from the workplace, the control room, or via smartphone. Alarm messages are automatically sent via e-mail, Syslog, or SNMP trap when threshold values are exceeded. At the same time, the integrated monitoring allows all temperature data to be stored in a cloud or on local servers. This combination of monitoring and control makes the thermometer an indispensable tool for building technicians, IT administrators, and process engineers.

The robust housing, standards-compliant electronics, and low-maintenance design make the device ideal for long-term use in industrial and commercial facilities. The simple installation via Power over Ethernet (PoE) or external power supply allows for easy integration even in challenging installation environments. With its ability to combine measurement, alerting, and control in one system, the Wiesemann & Theis Web-Thermometer Relay marks a significant advancement in automation technology.

Functional Integration and Smart Technology

The main strength of this monitoring system lies in the close integration of temperature measurement, relay control, and network communication. Through the integrated web interface, users can access and configure all functions directly via a browser. No additional software installation is required. The thermometer communicates via established industrial protocols such as OPC UA, MQTT, and REST, allowing seamless integration into modern IoT monitoring and building management systems. Thanks to this openness, the device is ideal for automated control processes, energy management, or climate control systems.

The internal web server visualizes temperature trends and offers extensive analysis functions. Data can be exported directly or stored permanently via the integrated temperature data logger. Up to twenty years of data storage is possible, supported by precise timestamps and a battery-buffered real-time clock. The cloud-based architecture simplifies global remote access – ideal for regional and international installations in industrial networks or IT centers. When defined threshold limits are reached, not only is an alarm triggered, but the switching action via the relay is also activated, eliminating the need for manual intervention.

Technical Features at a Glance

• Measurement range: -50 °C to +180 °C, optional up to +650 °C
• Relay switching output: Automatic switching during temperature exceedance
• Communication: MQTT, OPC UA, REST API, SNMP
• Network connection: Ethernet with PoE or external power supply
• Web interface: Browser-based, no software setup required
• Data storage: Temperature data logger for up to 20 years
• Alarm functions: Up to 12 configurable thresholds; notifications via e-mail, SNMP, app or Syslog
• Data security: TLS encryption and user authentication
• Analysis functions: Real-time graphics and trend statistics
• Housing: Industrial-grade and robust for continuous operation

Automatic Control via Relay Output

The key distinguishing feature of the Web-Thermometer Relay is its integrated relay switching output. This allows direct control of external devices – such as fans, heaters, or air conditioning components – without the need for an additional control unit. The switching output responds to previously defined temperature limits, creating an autonomous control logic. In a server room, for example, the relay output can be activated to switch on ventilation systems as soon as a temperature above 30 °C is recorded. Likewise, in storage areas, the cooling system can be automatically activated when values rise.

This functionality reduces human intervention, automates operational processes, and ensures higher operating reliability. Especially in systems where constant temperatures are vital for electronics, chemicals, or food, the relay output proves indispensable. Combined with cloud-based notifications, this system ensures that temperature deviations are not only detected but immediately corrected.

Fields of Application and Use Cases

Whether in industry, IT, or infrastructure – the Wiesemann & Theis Web-Thermometer Relay can be used in a wide variety of contexts. It can serve as a standalone monitoring unit or as an integral part of an automation solution:

• Server rooms and data centers: Monitoring ambient temperatures and automatic switching of cooling systems via relay.
• Industrial plants: Reliable temperature control in production lines and paint booths.
• Building technology: Integration into ventilation, heating, and air conditioning systems for energy-efficient control.
• Storage: Monitoring temperatures in cold storage or freezers – ideal for cold chains and fresh logistics.
• Transport and logistics: Remote monitoring of temperature zones in refrigerated vehicles.
• Healthcare and research: Reliable temperature control for laboratories, medicine storage, and clinical environments.
• Energy and utilities: Temperature measurement on generators, pumps, and switch cabinets for early fault detection.
• Automation and smart building: Linking with other IoT sensors for autonomous responses to climate changes.

Cloud-Based Temperature Monitoring

With its cloud-based temperature monitoring function, all measured data can be stored and retrieved in real time. Users can access the system from anywhere to analyze trends, generate reports, or define automatic alarm rules. Through integration with common IoT services, temperature data can be directly embedded into energy management systems or automation processes. The temperature data logger ensures that no measurement values are lost – even in the event of network interruptions, they are securely retained in internal memory.

Operational Advantages and Reliability

• Minimal installation effort through PoE power supply and web interface
• Energy-efficient continuous operation with low power consumption
• Completely maintenance-free thanks to passive cooling and robust design
• Compliant with industry-standard EMC and safety regulations
• Integrated relay output for direct control of peripheral devices
• Five-year manufacturer warranty and long-term spare parts availability

Intuitive Operation and Configuration

Thanks to the user-friendly web interface, commissioning is possible within minutes. All measurement parameters, switching thresholds, and alarm options can be configured without special software. Via tabs, users can set thresholds, assign relay actions, and organize data retrieval. Numerous graphical visualizations provide instant insight into temperature trends. Integration with higher-level systems or cloud services is also easily achieved via API interfaces. This openness provides maximum compatibility for system integrators and automation engineers.

Smart Complete Solution for Modern Infrastructure

The Wiesemann & Theis Web-Thermometer Relay is more than a simple temperature sensor – it is an intelligent control center for reliable temperature management. The combination of precise measurement technology, relay control, cloud connectivity, and energy efficiency makes it one of the most comprehensive solutions in the field of digital building automation and industrial process control. It ensures continuous control, reduces energy costs, protects systems, and enables data-driven decision-making. This makes the Web-Thermometer Relay from Wiesemann & Theis a future-proof investment for any application where temperature plays a decisive role.