IOP Institute of Physics

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Gas Sensing Solutions (GSS) Ltd

For developing and commercialising an optical carbon dioxide gas sensor. The low-power sensor allows for greater accuracy and energy savings for customers in a range of markets.


Elevated CO2 levels inside buildings can have potentially harmful health effects. Current and incoming legislative requirements are driving demand for low-power-consumption, long-life and wireless-compatible CO2 gas sensors. To meet the requirements, these sensors must be able to stabilise – power up, take a measurement and power down – as quickly as possible.

Non-dispersive infrared (NDIR) sensors are the most widely used for real-time measurement of CO2. Standard NDIR sensors use an incandescent bulb and pyroelectric detector combination, which require optical filters, take time to stabilise and can use a lot of power. The GSS solution uses novel mid-infrared light-emitting diodes (LED) and photodiode (PD) detectors. The LED and PD can be precisely tuned to the absorption wavelengths of the gas to be detected without the need for an additional optical filter. This combination offers low power consumption and minimal stabilisation time.

The GSS sensors are wireless-compatible, portable, accurate and can be battery powered. As a result, they are finding a growing number of applications, including industrial safety, building control and horticulture. In diving, the technology is being incorporated into rebreathing apparatus where it provides a valuable enhancement for customers.


The company
Gas Sensing Solutions Ltd was founded in 2006 to develop and manufacture unique, high-performance CO2 sensors. It began trading after two years of research and development and trademarked sensors are now in full production at its Glasgow facilities.

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