Oxygen Analysers

Question 1

Wht is o2 analyzer

Answer 1

★used to measure trace or percent levels of o2 concentration present in gas streams or the surrounding atmosphere

Question 2

Principle

Answer 2

★it has o2 sensor react with o2 present in atmosphere or gas stream

★it produce a electrical current tht is proportional to level of 02 it is reacting with

Question 3

Types

Answer 3

Electrical analyzer

Physical or paramagnetic analyzer

Electrochemical analyzer
*Polygraphic
*Galvanicfuel cell

Question 4

Electrical analyzer

Answer 4

Comparing cooling effect of o2 enriched gas sample on heated wire

O2 enriched air cools faster thn room air gas

Principle (thermal conductivity)

Sample drawn into analyzer through capillary line

Only for 02 and nitrogen

Failure to calibrate
*Device battery weak
*Plugged capillary line
*Defect in electrical component

Question 5

Physical /paramagnetic analyzer

Answer 5

*Uses paramagnetic property of oxygen
*The more oxygen=more magnetic field altered
*All type of gases can be used
*Safe in room with flammable things
*Silca gel-dry out sample before entering analyzer
*Failure
*Water
*Chamber defect
*Plugged capillary line

Question 6

Electrochemical Analyzer

Answer 6

Each o2 molecule accept 2 electrons and become chemically reduced

↑o2↑current. ↓o2↓current

Electrical current=o2 percentage

Both types can be used in flammable situations

Polographic analyzer
Battery to polarized the gas sampling probe
Faster response

Galvanic fuel cell
No battery

Failure-weak battery exhausted supply of chemical reaction damaged membrane over probe