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Gas Sensor Dip‐Electrode for Ethanol Measurement

The on-line measurement of ethanol in liquid has been determined by estimation of ethanol in the exhaust gas with a flame ionization detector, gas chromatograph, mass spectrometer, or semiconductor gas sensor. The direct measurement in the exhaust gas was affected by the air flow rate and the agitation speed. To prevent these influences, a silicone tube was placed in the solution; and ethanol diffused into the silicone tube and was transferred by continuous flushed air stream at a constant flow rate to the measurement equipment. All these systems were complicated and expensive. Therefore, we developed a simple gas sensor dip-electrode (GSDE) for the direct measurement of ethanol in the liquid. Inside the GSDE, a semiconductor is placed in a housing and covered by a microporous silicone membrane.' The GSDE is submerged directly in the liquid sample. Ethanol from the sample permeates the membrane; and after a short time, the alcohol content in the gas reaches equilibrium with the concentration in the liquid. The response time is in the range of 1-1 5 min, depending on the type of membrane and the