Talk:Raw signal of the oxygen sensor

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Talk:Raw signal of the oxygen sensor

MitoPedia O2k and high-resolution respirometry: O2k-Open Support

Description

The raw signal of the polarographic oxygen sensor (POS) reflects the number of O₂ molecules reacting with the sensor. Calibration of the raw signal with the known air oxygen concentration at a given barometric pressure and temperature allows for exact measurement of the oxygen concentration in the O2k chamber. See O2k-Support page: Oxygen signal. Observation of the raw signal values is important for quality control and trouble-shooting procedures.

Abbreviation: R

Reference: MiPNet06.03 POS-calibration-SOP, MiPNet12.20_O2k-calibration_tutorial

DatLab 8

Raw data displayed in the status bar

Raw signal display

The control panel at the very bottom of the measurement window shows the raw signal values.

Typical values at atmospheric O₂ concentration

After equilibration with the stopper in open chamber position, the raw signal should be close to 2 µA (values between 1 and 3 µA are acceptable at temperatures between 25 and 37 °C and altitudes up to 1000 m above sea level).

Typical values at 'zero oxygen'

After O2 removal from the O2k chamber by dithionite or oxygen consuming biological samples, the raw signal should be stable and < 2% of the signal at air saturation, but < 5% is acceptable.

A raw signal of more than 5 % of air saturation level should be addressed by a service of the polarographic oxygen sensor.

DatLab 7

Raw data displayed in the status bar

Raw signal display

Raw data from the POS are shown together with other readings in the bottom status bar, the second value refers to chamber A, the third to chamber B (see orange arrows)

Typical values at atmospheric O2 concentration

After equilibration with the stopper in open chamber position, the raw signal should be close to 2 V (values between 1 and 3 V are acceptable at temperatures between 25 and 37 °C and altitudes up to 1000 m above sea level).

Typical values at 'zero oxygen'

After O2 removal from the O2k chamber by dithionite or oxygen consuming biological samples, the raw signal should be stable and < 2% of the signal at air saturation, but < 5% is acceptable.

A raw signal of more than 5 % of air saturation level should be addressed by a service of the polarographic oxygen sensor.

MitoPedia O2k and high-resolution respirometry: DatLab