Why do I see peaks in the graphs of the SDR software (especially in the oxygen signal) when I open the incubator door / take the plates out of the incubator?

There are different reasons:

• Temperature effect: The signal of the optical sensor, especially the oxygen sensor, depends on temperature. If you open the incubator, the temperature changes, but the software uses the constant, user-defined temperature typed into the software for calculation. A temperature drop leads to decreasing oxygen / pH signals and vice versa.
• <link products category sensor-probes element>OxoDish® & hypoxic conditions: Opening of the incubator door leads to an upward peak in oxygen because ambient air enters the hypoxic sample.
• <link products category sensor-probes element>HydroDish® & CO₂ atmosphere: Opening the incubator door leads to an upward peak because CO₂ leaves the incubator. As the pH of the buffer for cell cultivation is regulated by the CO₂ atmosphere in the incubator, this leads to a higher pH within the sample.