Method and apparatus for zero calibration of oxygen-sensing pola

Details Method and apparatus for zero calibration of oxygen-sensing pola Method and apparatus for zero calibration of oxygen-sensing pola

1984-04-25

1985-09-17

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204402, 204415, G01N 2746

Patent

active

045419019

ABSTRACT:
The calibration of a polarographic oxygen sensor (20) at zero oxygen concentration is accomplished by providing an oxygen-free liquid environment at the sensor active surface. This is accomplished electrolytically by depleting a thin film of electrolyte (24) of oxygen to zero concentration with an oxygen-reducing cathode (6), and complementary anode (4), connected via a battery (10) and switch (12). The sensor (20) is placed into close proximity with the electrodes (4,6) and the oxygen in the electrolyte (24) reduced while its concentration is measured by the sensor (20). A low steady-state signal for the sensor provides the zero oxygen concentration calibration point.

REFERENCES:
patent: 2805191 (1957-09-01), Hersch
patent: 3088905 (1963-05-01), Glover
patent: 3328277 (1967-06-01), Solomons et al.
patent: 3454485 (1969-07-01), Hauk et al.
patent: 3526577 (1970-09-01), Molloy
patent: 4092233 (1978-05-01), Clemens et al.
patent: 4170523 (1979-10-01), Buzza et al.

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