The quality of indoor air is a decisive factor for health, comfort, and productivity. Elevated CO₂ concentrations significantly affect concentration, well-being, and performance – whether in offices, educational institutions, production facilities, or agricultural buildings. With the Web-IO Carbon Dioxide, Wiesemann & Theis offers a powerful IoT-capable measuring system that accurately detects the CO₂ concentration in the ambient air and provides it in real time over the network.

The device is far more than a simple sensor: it combines measurement accuracy, long-term data archiving, flexible network connectivity, and cloud integration in a compact unit. Thanks to versatile communication protocols, it can be easily integrated into industrial, building, or agricultural technology systems – optimized for Industry 4.0 applications and smart energy-saving management. The Web-IO Carbon Dioxide is therefore a reliable solution for permanent air quality monitoring in indoor and climate-sensitive environments.

Precise CO₂ Measurement for Critical Environments

Equipped with a high-resolution infrared CO₂ sensor, the Web-IO Carbon Dioxide measures concentrations from 0 to 5,000 ppm (parts per million). This measuring range covers typical indoor CO₂ levels in schools, daycare centers, offices, or laboratories and also provides reliable results in agricultural installations. This allows continuous monitoring of air conditions in greenhouses or animal stalls to ensure optimal growth conditions for plants and animals.

A key feature of the device is the integrated LED traffic-light display that visually represents CO₂ values. If the carbon dioxide concentration exceeds predefined limits, the indicator lights up yellow or red, clearly signaling a critical air condition – ideal for rooms with high occupancy or food production areas with strict air quality limits. This direct display can be individually parameterized, making the device instantly operational even without a monitor or cloud connection.

Intuitive Operation and Web Interface

Through the easy-to-use web interface, users have direct access to live CO₂ measurement data and historical trends. All visualizations can be displayed in the browser – no additional software is required. Dynamic charts record long-term trends and support the analysis of seasonal or operational correlations. Limit values and alarm settings are configured via a menu and can be adjusted at any time.

The open HTTP interface allows current measurement data to be integrated at any time via AJAX or JavaScript queries – for example, into custom dashboard solutions or customer portals. Thus, the Web-IO Carbon Dioxide is also suitable for developers who want to create user-defined visualizations or mobile interfaces.

Comprehensive Alarm Functions for Maximum Safety

Up to 12 independent alarm channels can be configured individually. The device automatically responds to defined CO₂ limits and triggers real-time notifications. Alerts are sent via email, SNMP trap, Syslog, or visual LED signals. This multi-channel functionality ensures that both security and maintenance personnel are promptly informed – crucial for schools, laboratories, or agricultural environments with sensitive climate conditions.

Additionally, the Web-IO Carbon Dioxide can generate automated reports. Periodic measurement summaries can be sent via email or uploaded to an FTP server, allowing convenient documentation for audits, quality management, or regulatory compliance. All reporting intervals are freely selectable.

Industry 4.0 Integration with OPC UA and MQTT

The Web-IO Carbon Dioxide is consistently designed for networking and digital automation. Industrial interfaces such as OPC UA, REST, MQTT, and Modbus TCP enable integration into IoT, SCADA, and cloud systems. With SNMP protocol support (v1 to v3), the device can also be incorporated into traditional network and monitoring infrastructures. For developer-oriented applications, direct TCP and UDP socket access is available for implementing customized control or notification scripts.

With the integrated W&T cloud connection, an optional centralized, globally accessible IoT platform is available. Measurement points can be centrally monitored and analyzed graphically – including trend analysis and automated alarm notifications. This makes the device an essential component of networked building technology and digital air quality management.

Long-Term Data Logger and Global Analysis

The internal data logger records CO₂ measurements at configurable intervals (15 seconds to 1 hour). Local storage capacity covers several weeks up to 20 years – ideal for long-term environmental and energy analysis. Data can be exported in formats such as Excel, CSV, or via FTP upload and is provided with precise, battery-buffered timestamps. To enhance data security, the internal time base can be synchronized via an NTP server.

Cloud synchronization enables worldwide data access – a key advantage for distributed facilities, building complexes, or mobile agricultural sites. Especially in smart building concepts, this function aids in centralized trend analysis and system optimization in energy management.

Technical Specifications

• Measurement range: 0–5,000 ppm CO₂ (±50 ppm + 3% of reading)
• Data acquisition: 15 s to 1 h sampling rate – storage up to 20 years
• Communication: MQTT, OPC UA, REST API, SNMP (v1–v3), Modbus TCP
• Alerting: 12 configurable thresholds via email, Syslog, or SNMP
• Display: LED traffic light for CO₂ status (green/yellow/red)
• Data access: HTTP, TCP/UDP sockets, JavaScript/JSON
• Data export: Excel (.xls/.csv), FTP, email reports
• Power supply: Power over Ethernet (PoE) or external 24 V DC
• Certification: EN 61000-6-2, EN 55032, EN 61000-3-2/-3-3
• Enclosure: Robust industrial housing with DIN-rail mounting

Applications

• Offices and schools: Regulation of ventilation and enhanced concentration through continuous CO₂ monitoring.
• Building automation: Combination with ventilation systems for energy-efficient climate control in smart buildings.
• Agriculture: Monitoring of barn and greenhouse climate for plant and animal health.
• Food processing: Reliable quality assurance through controlled atmospheric conditions.
• Research and laboratories: Stabilization of environmental parameters in test setups or experimental installations.
• IT infrastructure: Integration into monitoring systems to prevent climate-related hardware issues.

Energy Efficiency and Standards Compliance

With Power over Ethernet (PoE), the Web-IO Carbon Dioxide reduces cabling effort while supporting Green IT strategies for energy savings. Its power consumption is low, and the electronics are optimized for 24/7 operation. All components meet industrial EMC requirements according to EN 61000-6-2 and EN 55032 Class B. An external power supply can optionally be used where no PoE infrastructure is available.

Durability and Reliability

Wiesemann & Theis develops and manufactures the Web-IO Carbon Dioxide in Germany under strict quality control. The compact industrial design ensures durability and maintenance-free operation for many years. The standard five-year warranty underscores the reliability and longevity of the product line. The DIN-rail mounting allows quick integration into existing infrastructures.

A Multifunctional CO₂ Monitoring System for Modern Environments

The Web-IO Carbon Dioxide from Wiesemann & Theis provides a high-precision, network-based solution for all applications where air quality plays a crucial role. With its IoT capability, cloud connectivity, and integrated alarm architecture, it represents a future-proof tool for energy optimization and health management. Whether for monitoring classroom air, office climate, or industrial process air – this device combines precision, reliability, and digital networking at the highest level.