OCIEngine Pro ethanol sensor

Miniaturized infrared spectroscopy sensors dedicated to ethanol measurement

OCIEngine PRO is an infrared spectrometer that measures Volatile Organic Compounds (VOC) in the air. It is specific to analyse a molecule of interest, such as ethyl alcohol.

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

Technical specifications

Alcohol detection

Unit of measurement Alcohol content in air: 1/10 ppm
Measurement range From 5 to 500 ppm
Measurement accuracy
(max error)
– ambient temperature: 23°C (± 3°C)
– wet air inlet (>95% RH, 23°C): ethanol gas
– flow rate: ~ 1 L/min
± 2 ppm @ 10 ppm
± 8,5 ppm @ 50 ppm
± 11 ppm @ 300 ppm
Sampling period 125 ms
Response time 1s (τ=63%), at a flow rate of 1L/min

Sampling characteristics

Air inlet Minimal relative pressure at measuring cell inlet port: 0.3 millibars
Maximal relative pressure at measuring cell inlet port: 10 millibars
Flow rate range From 0,1 to 1,5 L/min
Humidity  < 100% relative humidity (RH), not condensing

Environnemental conditions

Operating conditions From 0°C to 50°C
Storage From -10°C to 70°C
Typical starting time at 23°C 5 minutes (30 minutes at full spec)

Electrical conditions

Supply voltage 3,7 VDC min
5,5 VDC max
Input current 1,5 A max
Communication interface RS232 protocol
x3 Pico-SPOX MOLEX connector (2, 3 and 5 contacts)

Package information

Dimensions  125 x 30 x 22 mm
Weight ~20 g
Fixing parts 2 tapped holes for M3 fixing

Sensor architecture

Mechanical drawings