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Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply
Intelligent duct temperature humidity CO2 sensor - 24 VDC supply

Intelligent duct temperature humidity CO2 sensor - 24 VDC supply


This is an intelligent, multifunctional duct sensor. It measures temperature, relative humidity and CO2 (carbon dioxide). The supply voltage is 24 VDC. The sensor algorithm controls the single analogue output based on the measured values. This single output can be used to directly control an EC fan, an AC fan speed controller or a damper actuator. The output type can be selected: 0-10 VDC / 0-20 mA / 0-100 % PWM. All measurements and the output value are available via Modbus RTU. The CO2 sensor element is replaceable. All settings can be adjusted via Modbus RTU.


Article code DCMFF-2R
Category Duct CO2 sensors
Available
Current stock 27 U.
Next arrival 09/10/2020 - 160 U.
Factory lead time 4 Week(s)
Documents
- Selectable temperature, relative humidity and CO2 ranges
- Fan speed control based on T, rH and CO2 levels
- Bootloader for updating the firmware via Modbus RTU communication
- Modbus RTU (RS485)
- Removable CO2 sensor element for easy calibration and verification
- Long-term stability and accuracy
- Maintenance and control of temperature, relative humidity and CO2 levels in HVAC ducts

See this product in the following solutions:
Solution code
Title
Description
CO2 control, EC motor, 230 VAC
Demand based ventilation for EC fans. The intelligent sensor will control the EC fan speed and maintain temperature, relative humidity and / or carbon dioxide (CO2) levels within their selected ranges. The three ranges can be adjusted via Modbus RTU. By narrowing a range, it is possible to prioritise this parameter. The intelligent sensor features an enclosure for air duct mounting and the power supply is suited for DIN rail mounting in an electric cabinet. The power supply provides extra protection against short circuits and overload at the 24 VDC side.
CO2 control, EC motor, 230 VAC
Demand based ventilation for EC fans. The intelligent sensor will control the EC fan speed and maintain temperature, relative humidity and / or carbon dioxide (CO2) levels within their selected ranges. The three ranges can be adjusted via Modbus RTU. By narrowing a range, it is possible to prioritise this parameter. The intelligent sensor feature an enclosure for air duct mounting. The IP65 power supply is suited for direct wall mounting and features extra short circuit and overload protection for the 24 VDC circuit.
Frequently asked questions:
Together with the increased thermal insulation of our buildings, the importance of a smart ventilation system is rising in order to maintain a good indoor air quality and to minimize energy losses. The following parameters have a direct impact on the health, the sense of well-being and the comfort of the residents: - Temperature - Relative humidity - CO2 As a specialist in control solutions for HVAC and ventilation systems, Sentera developed a wide range of sensors – each with its own, specific purpose. To guide you in the process of determining the correct sensor for your application, we will explain these different parameters in detail. Temperature and relative humidity have a direct impact on the sense of well-being and comfort of the residents. Dry air leads to dry skin, itchy eyes, and irritated nasal passages. It can cause a bloody nose or an itchy throat and can aggravate symptoms of the common cold and some respiratory ailments. It also increases static electricity, which you feel in your clothes and hair and on furniture and carpeting. Too high relative humidity degrees will result in condensation forming on windows, walls and ceilings that are colder than the air temperature and potentially damaging building materials and causing odours in poorly ventilated spaces. Since temperature and relative humidity are the basic parameters that determine the comfort and well-being of residents, most Sentera sensors can measure these. CO2 - NDIR CO2 sensing technology Carbon Dioxide (CO2) is not only a by-product of combustion, it is also the result of the metabolic process in living organisms. Because carbon dioxide is also a result of human metabolism, concentrations within a building are often used to indicate whether adequate fresh air needs to be supplied to the space. Moderate to high levels of carbon dioxide can cause headaches and fatigue, and higher concentrations can produce nausea, dizziness, and vomiting. Loss of consciousness can occur at extremely high concentrations. To prevent or reduce high concentrations of carbon dioxide in a building or room, fresh air should be supplied to the room. NDIR is an industry term for “nondispersive infrared”, and is the most common and adequate type of sensor used to measure CO2. CO 2 gas molecules absorb the specific band of IR light while letting other wavelengths of light pass through. Finally, an IR detector reads the amount of light that was not absorbed by the CO2 molecules or the optical filter. The difference between the amount of light radiated by the IR lamp and the amount of IR light received by the detector is measured. The difference is proportional to the number of CO2 molecules in the air inside the room. Ventilation based on CO2-level is interesting in rooms with highly variable occupancy, such as meeting rooms, classrooms, universities, etc. Aerosols - The risk of becoming infected with the COVID-19 virus is higher in crowded and poorly ventilated spaces. Transmission of COVID-19 via aerosols rarely occurs outdoor or in enclosed spaces with a large volume. The general recommendation is to deactivate indoor air recirculation, to increase the supply rate of fresh air and the extraction rate of stale air. The ventilation system should remain active on continuous base. In case no ventilation system is available, window airing in combination with the monitoring of indoor air quality is recommended. For this purpose, Sentera advises to use CO2 transmitters. When many people share a limited space, the CO2 concentration will increase rapidly. Just like the risk of spreading COVID-19 virus particles. Long before occupants will perceive bad air quality or lack of ventilation, the Sentera CO2 sensors will alert you to increase ventilation or to open the window.
In general, the difference is the supply voltage: -M version: The –M versions are Power over Modbus supplied with 24 VDC via an RJ45 socket. They do not feature a physical out, however, there is an output value generated and read via Modbus RTU. When combining multiple Sentera products via Modbus RTU, we advise to use –M or -F series. -F version: The –F version is supplied with 18 - 34 VDC via a terminal block and features physical outputs. The -F version of the product is not suited for 3-wire connection. It has separate grounds for power supply and analogue output. Connecting both grounds together might result in incorrect measurements. Minimum 4 wires are required to connect -F type sensors. When combining multiple Sentera products via Modbus RTU, we advise to use –M or -F series. -H version: The –H version is a combination of –M and –F series. They can be supplied via Power over Modbus (24 VDC via an RJ45 socket) or via the terminal block, whichever the customer prefers. The –H series also features physical outputs via the terminal blocks. -G version: The –G version features 18 – 34 VDC or 15 – 24 VAC. The -G version is intended for 3-wire connection and features a ‘common ground’. This means that the ground of the analogue output is internally connected with the ground of the power supply. In case a Sentera sensor will be connected to other, non-Sentera branded products, we advise to use –G series.
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