Electrochemical gas sensors

Electrochemical gas sensor is the use of the electrochemical activity of the sample gas , the electrochemical oxidation or reduction , and thus to distinguish gas composition, gas concentration detection . The more common types of primary batteries electrochemicalCrank Shaft Sensor type ( it works similar to a fuel cell ) , the constant potential electrolysis cell type ( mandatory role in the current work , is a coulometric type sensors ) and so on. Currently, the electrochemical Car Sensors to detect toxic and harmful gases the most common and most mature of the sensor. It features small size, low power consumption, good linearity and repeatability , resolution can generally achieve 0.1ppm, longer life expectancy. Deficiency is susceptible to interference , sensitivity influenced by temperature changes . Honeywell 's technology companies produced British cities for the detection of H 2 S 3HH electrochemical sensors , the measurement range 0 ~ 50ppm, the maximum allowable value 500ppm, a resolution of 0.1ppm, dimensions about OD 42mmX high 18mm, its main source of cross-interference with CO, SO2, NO, NO2, H2 , etc. Zirconia oxygen sensors are electrochemical Engine Temperature Sensors component analysis as a relatively late development , began to appear in the 1960s , and its working groups rationale is based on the principle of concentration cell by measuring the gas to be analyzed and the reference gas oxygen concentration due to the concentration differences resulting force , to measure the oxygen content of the gas to be analyzed . Because of its simple structure , reliable operation , high sensitivity , good stability , fast response , easy installation , etc., it developed rapidly. Often used in sulfuric acid, air separation , boiler combustion analysis of multi-component gas of oxygen and oxygen-containing molten metal determination and so on.