This website uses cookies primarily for visitor analytics. Certain pages will ask you to fill in contact details to receive additional information. On these pages you have the option of having the site log your details for future visits. Indicating you want the site to remember your details will place a cookie on your device. To view our full cookie policy, please click here. You can also view it at any time by going to our Contact Us page.

Internet of Things and compensated air quality sensors

04 February 2019

By adding air quality sensors to smart building systems, engineers can implement early warning of the buildup of hazardous gases and chemicals, but commercial air quality sensors lack the integrated capabilities required to join a smart building network.

This deficiency can be overcome by turning to easy-to-use development kits which can add the processing power and wireless capability required.

MOS sensor basics

Metal oxide semiconductor (MOS) type sensors most closely match the monitoring requirements for smart building applications. The devices are compact, relatively inexpensive, can run from batteries, and the detection range matches the typical concentrations of C02 and VOCs (volatile organic compounds) in indoor workplaces.

In operation, the sensing element is heated to several hundred degrees Celsius (°C). The precise temperature determines the element’s selectivity to a specific gas or chemical. The sensitivity depends on the material’s thickness. 

The sensors are manufactured with either n-type or p-type semiconductor sensing elements. The sensing element has an electromechanical reaction with the target compound which changes resistivity causing a linear change from a known baseline value.

Read the full article in the February issue of DPA

Contact Details and Archive...

Print this page | E-mail this page