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Ventilation
Making sense of air quality sensors
All building ventilation, controls and BMS systems rely on accurate air quality sensors to provide minute by minute information, so that an informed decision can be made on the buildings operation. Here BAPI unlocks the world of air quality sensors
I
f air quality sensors start to provide irregular data, it means the BMS and ventilation are not working eff ectively or effi ciently, and people’s health and
productivity is greatly aff ected ... perhaps better known as Sick Building Syndrome. This is where sensors come in and below are a few
of the available air quality sensor options to combat and achieve a good level of indoor air quality (IAQ).
Particulate matter (PM) sensors
One aspect of IAQ is the amount of dust and other particles in the air. Particulate matter ranges • PM10 – very small particles found in dust and smoke • PM2.5 – 100 times thinner than a human hair and remain suspended for longer • PM1.0 – ultra-fi ne dust particles that penetrate directly through the lungs into the bloodstream Particulate matter sensors monitor the size and
concentration of these particles, communicating that data back to the BMS so that an informed decision can be made on the building’s operation, for example suppling more fi ltered air in to the occupied space. BAPI’s PM sensors, fi nalist in the HVR Awards,
for example, provide numerous options from a wall- mounted room unit, to duct applications and both provide three fi eld selectable ranges PM10.0, PM2.5 and PM1.0 via internal dip switches.
Carbon dioxide (CO2) sensors Research has proven that even low quantities of
CO2 can have a negative eff ect on your health and performance, ranging from breathing diffi cu ties, cullties, headaches, drowsiness and lack of concentration. This is why it is vital you have the right sensor for your application. One of the best sensors for occupied spaces would be a CO2 sensor (humans emit CO2).
Pick the right CO2 sensor?
Majority of CO2 sensors use single beam technology and this type of sensor requires annual calibration. They are not suitable for 24/7 applications such as hospitals, hotels and 24-hour
BAPI AIR QUALITY SENSORS
• Particulate Matter (PM) • Carbon Dioxide (CO2) • Volatile Organic Compound (VOC) • Total Volatile Organic Compound (TVOC) • Carbon Dioxide Equivalent (CO2e) • Refrigeration Leak Detection (RLD) • Carbon Monoxide (CO) • Nitrogen Dioxide (NO2)
supermarkets as they need to reset back to the factory base level every 24 hours and therefore will switch off for a number of hours to achieve this. BAPI recommends using a Dual Channel CO2 sensor, as it is suitable for all applications including 24/7. The award-winning technology used continuously self-calibrates and is guaranteed to provide accurate measurements for fi ve years, so no need for costly annual maintenance visits to recalibrate the sensor.
VOC sensors
What is a Volatile Organic Compound sensor (VOC)? VOCs evaporate from substances such as food and drink, cleaning products, paints, new carpets and furnishings (known as off gassing), even humans – from perfumes, colognes, breath and sweat. These cause eye, nose and throat irritations, headaches, dizziness fatigue; all summarised under the term SBS (Sick Building Syndrome). VOC sensors come in wall mounted, duct and harsh environment enclosure variations.
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November 2021
COMMERCIAL & INDUSTRIAL
25
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