VOC sensor includes control output, algorithm

August 31, 2020 // By Peter Clarke
VOC sensor includes control output, algorithm
Sensirion's SGP40 is a broad-band VOC sensor which detects high-VOC events and can place them in context for control, the company claims.

When built into an air quality monitor, it allows users to identify the sources of such events and take appropriate action. Integrated into smart air treatment devices, it enables automatic, demand-controlled operation.

The SGP40 is an integrated CMOSens sensor system on a single chip based on a metal oxide sensor. It provides a humidity-compensated indoor air quality signal via a digital I2C interface.

The technology used to make the sensor is robust against contamination by siloxanes resulting in long-term stability in terms of sensitivity and response time. It is also power efficient through the use of a micro-hotplate and this allows battery operated applications.

Sensirion's VOC algorithm analyzes VOC events detected by the SGP40 sensor and maps them to a VOC Index. This VOC Index provides a practical quantification of VOC events relative to each individual sensor's average indoor environment. The VOC Index indicates to what extent the indoor air quality has deteriorated or improved compared to the sensor's average VOC environment. This information can be used for gradually controlling the fan of an air treatment device or to provide users with feedback on their daily activity profile.

Both the SGP40 and the evaluation kit are available through Sensirion’s distribution network.

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