In modern IT infrastructures, industrial plants, and in the administrative and research sectors, reliable monitoring of temperature and humidity has long been indispensable. The Wiesemann & Theis Web-Thermo-Hygrometer combines high-precision sensor technology with an extensive digital infrastructure to record, evaluate, and make all relevant climate data available worldwide in real time. The combination of temperature sensor, humidity sensor, and integrated dew point measurement makes the device a universal tool for preventive climate control – from server rooms to production halls to archival storage.

This network thermometer is fully Industry 4.0 ready and offers maximum integration possibilities thanks to its support for numerous communication protocols such as MQTT, OPC UA, and REST. The W&T Cloud enables worldwide data access, while security features such as TLS-encrypted communication, user role management, and precise timestamps via battery-backed real-time clock ensure the highest data integrity. Power is supplied via either Power-over-Ethernet (PoE) or an external power supply, making the Web-Thermo-Hygrometer highly versatile.

With a temperature measurement range from ‑40 °C to +85 °C and a humidity range from 0 to 100 % RH (non-condensing), it covers virtually all practical applications. Integrated dew point calculation provides protection against condensation damage to hardware or stored materials, especially in critical environments. In addition, the temperature and humidity data logger allows for long-term storage of measurement values – from 12 weeks up to 20 years – and offers export options for Excel, FTP, or ODBC-based systems.

Technical Precision for Demanding Climate Measurements

The Web-Thermo-Hygrometer uses state-of-the-art measurement electronics. The temperature sensor offers high resolution and low tolerance, while the humidity sensor is temperature-compensated to provide stable values even under changing environmental conditions. Dew point measurement uses both parameters to deliver precise assessments of condensation risk. These values can be accessed, analyzed, and used for automation processes instantly via the intuitive web interface or direct API requests.

For server room monitoring, administrators can define individual thresholds for temperature, relative humidity, and dew point. When a threshold is exceeded, the system automatically responds: it sends notifications via e-mail, SNMP trap, or Syslog, and through IoT integrations, enables direct control of connected climate systems. This feature set ensures not only operational safety but also optimized energy management.

Technical Specifications in Detail

• Temperature measurement range: ‑40 °C to +85 °C
• Humidity measurement range: 0 to 100 % RH (non-condensing)
• Dew point measurement: Real-time calculation for condensation prevention
• Data logger: Long-term storage from 12 weeks to 20 years
• Protocols: OPC UA, REST API, MQTT, SNMP, Modbus‑TCP
• Interfaces: HTTP, TCP/UDP sockets, Sensobase, ODBC
• Alarm options: Up to 12 configurable thresholds with notifications
• Power supply: PoE or external power adapter
• Certifications: EN 61000‑6‑2, EN 55032 Class B
• Mounting: DIN rail compatibility

Cloud-Based Climate Monitoring

Integration with the W&T Cloud enables worldwide access to current and historic measurement values. Cloud dashboards show temperature and humidity trends in graphical form, including dew point trends. Through user management, teams can view and process measurement data collaboratively. All data is transmitted securely in accordance with current IT security policies. For companies with distributed locations, cloud integration offers a clear advantage by centralizing monitoring and reporting, saving time and costs.

Advantages at a Glance

• Precise measurement of temperature, humidity, and dew point
• Seamless IoT integration via MQTT, OPC UA, REST
• Alerts via e-mail, SNMP, Syslog
• Long-term data storage and analysis options
• Web interface for monitoring without software installation
• PoE or external power supply
• Standards-compliant for industrial environments
• DIN rail mounting for easy installation
• Five-year warranty

Practical Use Cases

• Server room monitoring: Prevents overheating and moisture damage.
• Office climate optimization: Reduces energy costs and improves comfort.
• Industrial processes: Ensures consistent quality through climate stability.
• Archiving and storage: Protects against damage from excessive humidity.
• Green IT: Efficiency improvement of cooling systems through data analysis.
• IoT networks: Automated responses to changes in climate conditions.
• Compliance requirements: Comprehensive documentation for audits.

Optimization Tips for Users

• Place the device centrally for representative measurements.
• Define alarm thresholds for temperature, humidity, and dew point.
• Export data regularly to analyze long-term trends.
• Use MQTT option for integration into control systems.
• Calibrate sensors according to manufacturer recommendations.
• Combine the device with other environmental sensors for 360° monitoring.

Complete Solution for Modern Climate Monitoring

The Wiesemann & Theis Web‑Thermo‑Hygrometer is a future-proof investment for precise and flexible indoor climate monitoring. It combines high-resolution sensors, versatile IoT interfaces, and user-friendly cloud integration into a robust industrial device. With detailed dew point measurement and energy-efficient design, it is ideal for server rooms, workplaces, production lines, and storage environments where climate control is critical to safety and performance. For those focused on reliability, ease of use, and digital integration, this device offers a fully optimized solution for temperature and humidity monitoring in the era of Industry 4.0.