EU declaration conformity
TVOC sensor | wall mounting | LED indicators | 24 V DC
Product description
This sensor measures temperature, relative humidity, TVOC (Total Volatile Organic Compounds), and ambient light, and is typically used in commercial and residential HVAC applications.
Measurement and Output
It measures temperature, relative humidity, TVOC, and ambient light levels. Measured values are transmitted via three analog outputs (0-10 V default, with selectable types available) and Modbus RTU.
Control and Flexibility
The ambient light sensor can be used to control the ventilation system based on room occupancy.
All settings can be configured via Modbus RTU.
The light intensity of the LEDs used for status indication is adjustable.
Maintenance
The TVOC sensor element can be replaced when necessary.
This sensor offers comprehensive air quality monitoring and flexible control capabilities.
Documents
Additional specifications and description
TVOC stands for Total Volatile Organic Compounds. These are chemicals that can easily turn into gases and are often found in everyday items like cleaning products, paints, varnishes, and even some building materials and furniture. They are also produced by humans and animals. The most common compounds are benzene, ethylene glycol, formaldehyde, methylene chloride, tetrachloroethylene, toluene, xylene, and 1,3-butadiene.
This sensor has three analogue outputs. Each of them transmits one of the measured values. E.g. by default, output 1 will transmit 0 Volt at 0 °C and 10 Volt at 50 °C. Each output value varies proportionally in function of the measured temperature, humidity or TVOC concentration. The measured temperature is available via output 1, relative humidity via output 2 and TVOC concentration via output 3. By default the output type is 0-10 Volt but other output types can be selected via de Modbus holding registers.
This sensor requires very little configuration. It is almost directly usable once it has been installed. Temperature and relative humidity are often region- and seasonal-specific. The presence of VOCs depends on the specific sources and activities taking place in a particular environment. These parameters are still adjusted to the correct values during installation. The other default settings will be suitable for most applications. However, they can also be adjusted via the respective Modbus registers if necessary. A different output type, for example, can be selected to make it compatible with other devices: 0-10 V DC; 0-20 mA; 0-100% PWM; Modbus RTU. Also the light levels of the LEDs used for status indication are adjustable. The Modbus register map provides an exhaustive list of all programmable settings.
The spring contact terminal blocks shorten wiring and installation time. They eliminate the need for routine maintenance and ensure a reliable contact for solid or stranded wires. The supply voltage is 24 V DC. The power supply (V-) and output (GND) ground terminals are not connected internally. This means that a 4-wire cable is required to connect this sensor. Most 24 V DC power supplies have short-circuit, overload, and overvoltage protection. A 24 V DC supply voltage improves the safety and dependability of your installation.

How Is the Sensor Mounted Indoors?
This sensor can be installed indoors on a wall or on a surface. The mounting holes are adapted to standard European wall mounting boxes. The sensor can be attached to the wall mounting box with two screws. The sensor enclosure will cover the entire wall mounting box. To ensure optimal performance, the sensor should be protected from direct sunlight.
∞ Monitoring air quality
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