Bill Of Materials

Bill Of Materials

Some Theory

Low Cost Air Quality Sensor

Characteristics

  • Sensitivity

  • Proven Accuracy

  • Location

  • Unit? Range of gases, particulates and environmental conditions

  • Secure

  • Credibility

  • Installation and Operation

  • Remote Management

  • High quality

Particle Phase

Larger particles (>0.1 μm)

Possible sensor measurement issues:

  • Particle detection capability – transport of particles to sensor, sensor sensitivity

    • Some use a passive means to move air through sensing region; others have a fan.

  • Signal translation to concentration estimate

Gas Phase

Metal oxide sensors

Possible sensor measurement issues:

  • Interfering gases in mixture

  • Measurement artifact due to temperature and humidity

  • Eventual failure of sensor

Electrochemical sensors

Possible sensor measurement issues:

  • Interfering gases in mixture

  • Measurement artifact due to temperature and humidity

  • Eventual failure of sensor

Photoionization sensors

Possible sensor measurement issues:

  • Baseline drift

  • Eventual failure of sensor based on lamp lifetime.

Seeed Studio

Libelium

Waspmpote

Waspmpote Plug and Sense

Sandbox

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