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nature : ion-selective electrode in a different category. Instructions from the electrode, a reference electrode and the electrolyte solution within separate electrolyte solution containing unknown gases and the solution composed of hydrophobic membrane permeability. A battery is actually. Only membrane permeability to allow the gas to be measured, and the ion solution is not passed until the membrane on both sides of the gas pressure equal balance. Through gas permeable membrane and electrolyte solution reaction, a measurable solution (pH) changes, the change from direct response to the electrode potential value reflected, and later testing with the sample gas directly proportional to the pressure. Measurement can be used to NH3, SO2, CO2, NO2, H k2S, HCN, HF, Cl2, I2 other gases.
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