Category
VOC and Air Quality Sensors for HVAC
Measure VOCs and pollutants to control ventilation and keep indoor air healthy.
A VOC sensor for HVAC picks up pollutants that CO2 alone misses, so ventilation can respond to the air people actually breathe rather than just occupancy. VOCs from cleaning products, furniture, printers and cooking can build up even when a room is quiet, and our Produal range covers room and duct sensing for this.
3 Products · PM / VOC / CO Sensors
Selection guide
VOC and Air Quality Sensors for HVAC Guide
Why measure VOC as well as CO2 in HVAC
CO2 tells you about ventilation for the people in a room, but it doesn't capture everything. VOCs from cleaning products, furniture, printers and cooking can build up even when few people are present. Measuring them lets the BMS ventilate for the air people actually breathe, not just for occupancy, which matters most where materials or activity vary more than headcount does.
VOC sensor products on this page
- RTX-VOC: room VOC and temperature, with motion detection, for individual spaces that need their own control.
- ILK: duct VOC, temperature and humidity, using a MEMS sensor that gives a reading related to CO2 level.
- RTX-CO2-D-RH-VOC: a touchscreen room transmitter measuring CO2, VOC and humidity together, for the fullest picture in one device.
Typical applications
- Offices and meeting rooms with changing activity through the day.
- Hotels, restaurants and retail, where cleaning products and cooking add to the VOC load.
- Schools and healthcare waiting areas, where both occupancy and materials matter.
For particulate (PM) or carbon monoxide (CO) measurement, contact us with your application and we'll suggest options, since these need a different sensing technology to VOC. For CO2-based ventilation control, see CO2 Sensors for Demand-Controlled Ventilation.
FAQ
Common questions
Do these sensors measure PM2.5 or CO?
The products listed here measure VOC, with CO2, temperature and humidity available on some models. They do not measure PM2.5 or carbon monoxide directly. For PM2.5 or CO monitoring, contact us with your application and we'll suggest suitable options.
Why measure VOC as well as CO2 in an HVAC system?
VOCs come from materials and activities such as cleaning, furniture and cooking, not just from people, so they can rise even when CO2 stays low because the room is quiet. Measuring both gives the BMS a fuller picture and better ventilation control than CO2 alone.
Should I use a room or a duct VOC sensor?
Use a room sensor such as the RTX-VOC for individual spaces that need their own control. Use the ILK duct sensor where one air handling unit serves a larger area, giving one average VOC reading for that zone instead of a reading per room.
What is a MEMS VOC sensor?
MEMS stands for micro-electromechanical systems, a manufacturing method that packs the sensing element onto a small chip. The ILK's MEMS VOC sensor gives a reading related to CO2 level, small and consistent enough to use for duct-based demand ventilation control.
Can VOC sensing detect occupancy in a room?
Not directly, but the RTX-VOC pairs VOC and temperature measurement with a PIR motion sensor, which does detect occupancy. Together they let the BMS respond both to how many people are in a room and to pollutant levels from materials and activity.
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