OEM Transmitter for Optical CO2 Measurements

Electro-Optical Module EOM-CO2-FOM

The EOM-CO2-FOM are precise, single channel modules for non-invasive measurement. They are compatible with sensors type CD1 (measurement range from 10 - 250 hPa pCO2). The small outer dimensions and low power consumption enable a simple integration into custom monitoring and control systems. A serial communication protocol is offered for data exchange between a PC or another host unit and the EOM. RS232, RS485 or USB 2.0 is used as a digital interface. Additionally, the EOMs have 4 to 20 mA analog output. A Pt100 temperature sensor interface and the on-board pressure sensor ensure temperature and pressure compensated CO2 measurements.

  • Compatible with sensors type CD1
  • Small dimensions & low power consumption
  • Communication via RS232, or RS485 (PreSens proprietary or Modbus RTU)
  • 4 to 20 mA (current sink) analog output
  • Pt100 temperature sensor interface and on-board pressure sensor
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Biotechnology: Carbon Dioxide Monitoring in Process Development

In bioprocess development & production, monitoring dissolved CO2 in addition to pH and O2 provides valuable information. It ensures stress-free cultivation conditions during mammalian cell culture (e.g. CHO cell-line). Constant pH and / or oxygen supply and sufficient nutrition levels are key parameters to optimize yield. Thereby, excess CO2 can act as a stressor or even a toxin to the culture and has to be controlled. The chemical optical CO2 sensors can enhance performance of process monitoring during cultivation in disposables, leading to process optimization.

Scientific: Carbon Dioxide Monitoring for Biological Applications

Increased CO2 uptake from the atmosphere caused by anthropogenic sources is believed to cause ocean acidification, with not yet foreseeable effects on marine life and ecosystem. Monitoring pCO2 in experimental set-ups simulating future levels of carbon dioxide can help to gain knowledge on the effects of ocean acidification on marine fauna. Besides the marine application, monitoring pCO2 also allows knowledge to be gained on land-based plant physiology. Monitoring pCO2 helps increasing yield during aquaculture of fish (fish farming) by providing convenient growth conditions. Excess carbon dioxide levels need to be monitored as this leads to hyperventilation of sea animals.


CO2 sensors CD1 (optical SMA connector)
Phase resolution 0.01°
Sampling rate 0.11 sec. – 599.9 sec.
Temperature sensor Four-wire Pt100 sensor interface
Temperature performance 0.1 °C + Pt100 accuracy
Supply voltage 5 – 28 VDC
Power consumption in active mode 0.75 W
Power consumption in stand-by mode 0.25 W
Temperature: operating / storage From 0 °C to + 50 °C / from - 10 °C to + 70 °C
Relative humidity 0 % to 80 % (non-condensing)
Dimensions (L x W x H) 94.2 mm x 25.0 mm x 19.6 mm
Weight 39 g
Digital interface RS232, optionally RS485 (PreSens proprietary or Modbus RTU)
USB 2.0
1Depends on hardware configuration and parameter settings. < 0.7 s only possible without temperature sensor.


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