Under ideal conditions, electrochemical oxygen (O2) analyzers have approximately what degree of accuracy?
a. 1%
b. 2%
c. 3%
d. 4%
ANS: B
There are two common types of electrochemical oxygen analyzers: (1) the polarographic (Clark) electrode and (2) the galvanic fuel cell. Under ideal conditions of temperature, pressure, and rela-tive humidity, both types are accurate to within ±2% of the actual concentration.
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