Oil, gas & renewables


gas, which can then be electrically measured by the system.


In this gas sensor evaluation, the gas particles need to be physically in contact with the SPEC sensor. In other words, the ethanol sensor is basically measuring only the gas that is present at the exact location of the sensor itself. Therefore, to detect gases such as ethanol and CO accurately and effectively, place the sensors where the concentration of gas is expected to diffuse to


Figure 3. Performance of the ethanol sensor.


ETHANOL SENSOR EVALUATION In this ethanol sensor evaluation, the sensor used is the SPEC 3SP_Ethanol_ 1000 package 110-202 shown in Figure 2. This SPEC ethanol sensor generates a current


proportional to the volume of the captured gas. It is a three-electrode device: WE, RE, and CE. WE: Working electrode. This WE is biased at 0.7 V and used for sensing the gas vapor. RE: Reference electrode. This RE provides a stable electrochemical potential of 0.6 V bias voltage in the electrolyte, which is not exposed to the gas vapor. CE: Counter electrode (CE). The CE conducts when a gas is present. The level of conduction is proportional to the concentration of


Instrumentation Monthly October 2023


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