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Oxygen Analyzers

Unit 3 RCT Test

QuestionAnswer
What are Oxygen analyzers used for? are used for measuring the oxygen concentration in inspired gases
Paramagnetic analyzers (Physical analyzers): Works on the Pauling Principle of Paramagnetic Susceptibility. Oxygen is attracted to a MAGNETIC field, while CO2 and N2 are REPELLED. May be used with flammables.
Paramagnetic problems: They are affected by high altitudes The batteries may fail and they are difficult to calibrate They are position sensitive and fragile They cannot measure a continuously flowing gas (uses a bulb aspirator) They are expensive Really not used anymore
Are the most commonly used oxygen analyzers. They generally are classified as galvanic or polarographic devices. Electrochemical Analyzers
Whats an example of paramagnetic analyzer? Beckman D-2; it uses blue (dry) silica gel as a desiccant to dry the gas sample and prevent corrosion of the analyzers internal parts.
What does the electrical analyzer do? Uses the principle of thermal conductivity using a Wheatstone bridge. 2 wires receive current from a battery. One wire is exposed to ROOM AIR, the other is exposed to the GAS being measured. The side with more O2 is COOLER. *green*
What are the problems with electrical analyzer? Cannot be used with flammable gases. If gases other then N2 & O2 are present, the temp CHANGES make the readings INACCURATE because different gases are able to dissipate heat differently. CANNOT measure flow. It uses battery.
Electrochemical analyzers: Galvanic fuel cell; oxygen triggers a chemical reaction to create an electrical current. The amount of current flow is directly related to the amount of Oxygen. ex: Teledyne *blue*
Which analyzer does not have to be turned on? galvanic oxygen analyzers do not have to be “turned on”. They continually read 21% oxygen when the sensor is exposed to room air, therefore it is important to keep the sensor capped to prolong its life.
Which analyzer is green? Electrical analyzer
Which analyzer is grey? Paramagnetic "Physical" analyzer
Which analyzer is blue? Eletrochemial analyzer , teledyne
Electrochemcial analyzers explained: The gas sample to be analyzed is separated from the bath by a Teflon membrane. As the Oxygen travels through the membrane, a chemical reaction occurs, causing electrons to flow from the gold to the lead.
Created by: asiap23
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