Important: It is very important to calibrate the O
2
electrode at the temperature that will be used during
experiment. The output of the O
2
electrode is not temperature compensated and it is sensitive to
temperature. Follow the instructions provided by electrode manufacturer and description in the PBR
Software manual to perform the calibration.
5.5 CO
2
MODULE
The CO
2
module is designed for continuous monitoring of dissolved carbon dioxide concentration in the medium. The
module consists of external electronic unit for connection with Photobioreactor FMT150 Control Unit, sensor probe and
sensor communication cable (Fig. 24).
InPro5000/12/120 sensor from METTLER TOLEDO (www.mt.com) with integrated temperature probe is used for
potentiometric CO
2
concentration measurement. The InPro5000 sensor employs a gas permeable silicone membrane
which is tightly stretched around a special engineered flat pH membrane. CO
2
partial pressure can be calculated using the
pH and the temperature. For more information about CO
2
probe please refer to manual provided by electrode
manufacturer.
Fig. 24 CO
2
Module.
5.5.1 INSTALLATION
Follow these instructions to install and operate the CO
2
sensor:
• Before the first use of the electrode we recommend reading the manual provided by the electrode manufacturer
(www.mt.com).
• Assemble the electrode according to the manual provided by the electrode manufacturer. Individual steps of the
assembly are schematically shown in Fig. 25.
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