Infrared spectrometry technology at your fingertips

Expert in breath analysis, Olythe developed OCIEngine an infrared spectrometer to measure VOC in the human breath. This sensor is specific to analyze a particular molecule such as ethyl alcohol molecules.

The measuring chamber of the sensor is crossed by infrared radiation. When the exhaled air is introduced into this chamber, the molecules of interest absorb a part of the radiation, and reduces the intensity of the optical signal. The concentration of the gas can therefore be deduced according to Beer-Lambert’s physical law.

OCIEngine, a NDIR sensor to analyse VOC in human breath

Miniaturized Infrared Spectroscopy sensor dedicated to breath analysis

  • Measures the amount of alcohol in the breath
  • Detects alcohol residues in the mouth
  • Analyzes other breath Volatile Organic Compounds on request: Acetone (C3H6O), Carbon Dioxide (CO2), Carbon Monoxide (CO)
  • Dimensions: 21 x 21 x 80 mm
  • Weight: 17 g

[PDF] Download the OCIEngine datasheet

Main specifications

Alcohol detection

  • Measurement range: From 50 to 4000 µg/L
  • Measurement accuracy (max error):
    ○ ± 20 µg/L @ 100 µg/L
    ○ ± 40 µg/L @ 400 µg/L
  • Sampling period: 125 ms
  • Alcohol in mouth detection: Detection above 250 µg/L


  • Can be calibrated in dry and wet gas
  • Test gas condition: 34°C / >95% HR

Electrical characteristics

  • Supply voltage: 3,7 VDC min, 4,2 VDC max
  • Input current: 1,5A max
  • Communication interface: RS232 protocol, Voltage level: ±5,5V, 3 wires mode
  • Recommended cable sections for all I/O: ≤ 0.13 mm² (AWG ≥ 26)

Environnemental condition

  • Operating conditions: From 0°C to 55°C
  • Storage: From -10°C to 70°C

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