Gas Sensing Solutions (GSS) has released a new technical engineering paper demonstrating how power consumption in CO2 sensors can be minimised to reduce utility costs.

All GSS sensors use a technique called non-dispersive infra-red (NDIR) sensing where light is injected into the optical measure chamber, which contains the gas of interest.

The light that passes through the optical cavity is detected by the photo diode. The signal from the photodiode is digitised by the microcontroller and compared with a reference level stored in memory.

The microcontroller can then calculate the level of CO2 in the optical measurement chamber.

In comparison to many other sensors that use incandescent light sources, GSS sensors use a highly efficient light emitting diode (LED) to illuminate the CO2 gas.

The length of time the light source is active is also a major contributor to how much power is consumed by the sensor. The light source in a CO2 sensor can be run continuously or pulsed to minimise overall power consumption. 

GSS’ full paper describes the fundamentals that underpin the low power design of GSS sensors and how to calculate the power consumption of each device.

Strategies for reducing power consumption whilst optimising overall performance are also presented, including the new CozIR®‐Blink sensor.

The full paper can be accessed here.