Which of the following is not a cause of error that could occur in Hartman and Braun oxygen analyzer based on magnetic wind?
A. The filament temperature could be affected by changes in thermal conductivity of the carrier gas
B. Hydrocarbons in sample stream may react on the heated filaments
C. Gravitation chimney flow effect lead to errors when cross tube is horizontal
D. Combustible gases may react on the heated filaments
Answer:C
Which of the following is not a cause of error that could occur in Hartman and Braun oxygen analyzer based on magnetic wind?
A. The filament temperature could be affected by changes in thermal conductivity of the carrier gas B. Hydrocarbons in sample stream may react on the heated filaments C. Gravitation chimney flow effect lead to errors when cross tube is horizontal D. Combustible gases may react on the heated filaments
Explanation: Error occurs when cross tube is vertical. When cross tube is horizontal, errors due to gravitation chimney flow effect is avoided.