Air Sensor

SCA is a multi-sensor microsystem (MSM) to monitor for the presence of toxic chemicals (TICs), pollutants, volatile organic compounds (VOCs) and flammable gases in air.

The SCA integrates temperature, relative humidity, ionic compounds and metal oxide hotplate sensors. It exploits Temperature and Voltage Cycled operation combined with Electrical Impedance Spectrometer (EIS) to achieve improved gas discrimination. Alternate Current (AC) readout is less sensitive to drifts plus EIS allows to derive the sensor’ R/C equivalent circuit to decouple components that drift from the ones that represent the response to the gas, in support of drift mitigation algorithms. Thanks to its versatile analytical instruments and availability of on-board Interdigitated Electrodes, SCA is also an excellent experimental board for new sensitive materials. Several SCAs can be installed onto long cables for large area continuous monitoring.

Specifications

ELECTRICAL
Supply Voltage 1.5-3.6V
Max Current 1.4mA continuous when reading on-chip sensors with EIS
Size 5.5×3.9mm
Interface I3C or SENSIBUS, single data wire multidrop sensor array cable interface, 1.5-3.6V
Unique Identifier OTP 48bits Unique Device Identifier, 16bits User Defined
ELECTRICAL IMPEDANCE SPECTROSCOPY
Frequency 3.1mHz to 1.2MHz
Vpp output sinewave 156mV to 2.8Vpp
Coherent demodulation 1st, 2nd or 3rd harmonic
Output Reciprocal of real or imagery component
Wide Measurement Range From ohms to 100MΩ
TEMPERATURE
Range -40°C to 125°C
Accuracy ±0.1°C
POLYMMIDE
Detects Relative Humidity, Vapors
Range 0% to 100%
Accuracy ±0.5%
ALUMINUM OXIDE
Detects Ionized Particles and Vapors, i.e. Acids, Ammonia dissolved in water
Limit of detection 1ppm Ammonium
HEATED TIN OXIDE
Detects Air contaminants, Flammables, Cigarette smoke
Limit of detection 100ppb H2

Measurements

Applications

  • Indoor air quality monitors
  • Air cleaners
  • Ventilation control
  • Hazards monitor
Cables equipped with SCA arrays allow large area monitoring of gases, and estimation of gas cloud propagation direction, velocity and concentration.

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