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| As the heart of the OROBOROS Oxygraph the [[Polarographic oxygen sensor]] is of course the prime suspect when any kind of troubles are encountered. However, frequently problems can be traced either to inadequate software settings or to other hardware components (like the [[POS connector (technical service) |POS connector]]).
| | #REDIRECT [[OroboPOS]] |
| Therefore it is important to confirm the problem doing a [[Sensor test]] and to [[Locating a problem |localize the problem]].
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| ==Possible Problems==
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| ===Problems that require a full Sensor test and Localization of the Problem===
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| *unstable O2 signal
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| *unstable O2 flux
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| *high O2 signal at air saturation
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| *high O2 signal at zero oxygen
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| ===Special Cases: no further localization necessary ===
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| * [[Slow responding sensor]], if this has been confirmed by a [[Stirrer test]]. Note: The stirrer test is part of the sensor test. It is therefore recommended to do a full [[Sensor test]] whenever problems are encountered.
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| ==Performing the Sensor Test==
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| Confirm the problem by doing a [[Sensor test]] in the absence of biological material
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| ===Option 1.A: No problem was visible in the [[Sensor Test]]===
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| check the following DatLab settings
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| * [[Gain (O2 channel)]]
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| * [[POS calibration]]
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| * Scaling
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| If the problem is not visible when observing the [[Raw signal]] but is visible when observing the calibrated oxygen signal, then there is probable a problem with the [[POS calibration]].
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| ===Option 1.B: The problem was visible in the [[Sensor Test]]===
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| * proceed to Localizing the Problem
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| ==Localizing the Problem==
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| [[ Locating a problem|Locate the Problem ]] | |
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| ===Option 2.A: The problem could be localized on the [[POS]]===
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| '''Solutions 2.A'''
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| Follow the instructions for oxygen sensor service [http://www.oroboros.at/index.php?id=o2k-pos-service [MiPNet08.04]]. Use this opportunity to apply [[contact oil]] to the gold pin and thread connecting [[POS]] and [[sensor connector]]. After a sensor service or after applying anew membrane allow the oxygraph to run over night to achieve a stable signal before repeating the [[sensor test]].
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| If all service precautions fail to solve the problem, the [[POS]] has to be sent to us for further service (a recovery can not be guaranteed), or a new sensor is to be applied.
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| ===Option 2.B: The problem was not localized on the [[POS]]===
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| '''Solutions 2.B'''
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| If the problem was localized on an other component follow the instructions for this component. If you could not locate the problem contact OROBOROS Instruments.
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| {{#set: Technical service= Sensor|Technical service= O2 signal|Technical service= Sensor service| Technical service= O2 flux}}
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| {{Technical service}}
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| __SHOWFACTBOX__
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