Wireless & Networking

Minimising CO2 Sensor Power Consumption

The power consumed by the CO2 sensor depends on several interrelated factors. Attached application note describes the fundamentals that underpin the low power design of GSS sensors and how to calculate the power consumption of each device.

All GSS sensors use a technique called non‐dispersive infra‐red (NDIR) sensing where light is injected into the optical measurement 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 photo‐diode 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. The power consumed by the CO2 sensor depends on several interrelated factors.

Tough Gas Sensing Technology for Tough Situations



Pressure:

  • Survival from high vacuum up to 40bar
  • Operation from 400mbar up to 40bar
  • Operational 20,000 pressurisation / depressurisation cycles +- / 20mbar

 

Shock:

  • 70g Half Sine shock, 6ms pulse, 15 pulses

 

Vibration:

  • 2Hz to 13.2Hz: +-3.57mm Constant Displacement
  • 13.2Hz to 100Hz: +-2.5g Constant Acceleration
  • 2.5grms Random sweep, 5Hz, 350Hz, 500Hz

 

Lifetime:

  • Expected lifetime: > 15 years

Application Note

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