How to monitor indoor air quality? Indoor air quality or IAQ is not merely a matter of how the environment feels, polluted indoor air has a direct impact on our health and well-being. Together with the increased thermal insulation of our buildings, the importance of smart ventilation systems is rising in order to maintain a good indoor air quality and to minimise 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 – carbon dioxide or CO2 – VOC or Volatile Organic Compounds – carbon monoxide or CO – nitrogen dioxide or NO2. To monitor or control the amount of fresh air that is supplied into a building, it is important to monitor and control differential pressure, volume flow and air velocity. As a specialist in control solutions for HVAC and ventilation systems, Sentera developed a wide range of HVAC transmitters and sensor controllers – each with its own, specific purpose. All of them can be found in this section.
Temperature and humidity sensors
Sentera temperature and relative humidity sensors are available in different enclosures. They measure temperature and relative humdity. 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. 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 determining the comfort and well-being of residents, most Sentera sensors can measure or control these.
Sentera CO2 sensors are available in different enclosures. These NDIR CO2 sensors measure temperature, relative humidity and CO2. Carbon dioxide or CO2 is a result of human metabolism. Moderate to high levels of CO2 can cause headaches and fatigue. 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.
Sentera air quality transmitters are available in different enclosures. These TVOC sensors measure temperature, relative humidity and TVOC concentration. VOC or Volatile Organic Compounds evaporate from substances such as cleaning products, adhesives, paints, new carpets, copiers and printers to building materials and furnishings. VOCs are also emitted from humans and animals in their breath, sweat and directly from their skin. VOCs are known to cause eye, nose and throat irritations, headache, drowsiness, dizziness, nausea, difficulty concentrating and fatigue. Therefore, it is important to monitor the VOC levels and to extract the contaminated air from the area. TVOC is the sum of the different VOCs and is a good indicator of indoor air quality or IAQ.
Sentera CO - NO2 transmitters are available in different enclosures. They measure temperature, relative humidity, CO and NO2 concentration. Combustion processes - for example cars moving around in an enclosed parking garage - release toxic gases like nitrogen dioxide (NO2) and carbon monoxide (CO). In order to maintain an adequate health and comfort level, the concentration of these toxic fumes must be monitored so that fresh air can be supplied in time.
How to measure ambient temperature? Temperature is one of the basic parameters in the HVAC industry. These sensors measure temperature and transfer the measured value into an analogue output or a Modbus RTU register. From simple passive temperature sensors to more advanced digital temperature transmitters in different enclosures for a variety of applications - the Sentera product range covers it all. Discover all temperature sensors here.
How to detect a differential pressure level? Differential pressure relays or differential pressure switches can be used to detect clogged air filter, to generate an alert if the air flow drops below a critical level, etc. The differential pressure switch is activated when the differential pressure exceeds the setpoint. This setpoint or trigger point can be adjusted via a trimmer on the pressure switch.
Differential pressure transmitters are indispensable in a smart ventilation system. They can be used to monitor differential pressure over an air filter to generate an alert in case the filter gets polluted. Another typical application is to monitor volume flow and guarantee the supply of fresh air. The most recent series feature a fully digital, high resolution differential pressure transducer. These devices can also monitor air velocity in HVAC applications. The measured value is transferred into an analogue output or Modbus RTU register. All settings can be adjusted via Modbus RTU.
Differential pressure controllers can be used to guarantee a constant volume flow under fluctuating demands, to maintain a difference in pressure between two rooms, etc. Sentera differential pressure controllers are designed to control a fan or a valve in function of differential pressure, volume flow or air velocity in HVAC applications. The control output can be used to control a fan, a fan speed controller or an actuator powered damper. All parameters can be adjusted via Modbus RTU.
Accessories for differential pressure transmitters and controllers
Accessories for professional installation of differential pressure transmitters and controllers: transparent PVC tubes, differential pressure connection sets and pitot tubes to measure or control differential pressure, volume flow or air velocity.
Sentera provides innovative, easy-to-use control solutions for HVAC installations and ventilation systems. How to optimise your comfort, indoor air quality, safety and overall wellbeing? We have the answer!