GB/T 6285-2016Determination of trace oxygen in gases—Electrochemical method (English PDF)

3.1 Overview

The use of chemical batteries as a measure of oxygen in the gas sensor.

The gas to be measured in the appropriate form into the chemical battery, according to the oxygen in the chemical oxygen in the chemical characteristics of the battery, by measuring and oxygen

Content of a chemical function to determine the relationship between the potential of the chemical battery, or current, or conductivity and other physical quantities, to achieve the gas in the measured gas analysis

Determination.

3.2 fuel cell method

The battery used in the fuel cell method is a closed chemical charge consisting of an inert metal electrode (cathode), a lead electrode (anode) and an electrolyte

Pool. Oxygen in the gas diffuses into the cell through the polymer film, is reduced in the cathodic oxygen, and is oxidized at the anode lead. The battery reacts to electricity

The output signal of the flow sensor is proportional to the oxygen content in the gas.

The electrolyte of this type of equipment is acidic and alkaline two kinds of alkaline electrolyte is not suitable for the determination of trace oxygen in acidic gases, acidic

The solution is not suitable for the determination of trace oxygen in alkaline gases.

3.3 Hz battery method

The Hertz battery method uses a chemical cell consisting of a carbon alloy (cathode), a platinum wire (anode), and an electrolyte. Apply to the battery

Plus a DC voltage to provide electron transfer energy. The current generated by the battery reaction is the size of the sensor output signal and the oxygen content in the gas

Proportional.

This type of instrument is suitable for the determination of trace oxygen in inert and inactive gases, including hydrogen, nitrogen, carbon monoxide, freon, carbon

Compounds and so on.