When the oxide having the property of n-type conductivity is open to the atmosphere, it decreases the number of electron affecting on electrical property by the adsorbed oxygen and results in increasing the resistance. And, afterwards, if the specific gas (reducing gas) exists in the atmosphere, it reacts with the adsorbed oxygen and increase the electron in the oxide, resulting in decreasing the resistance.

                                                  
So to speak, the electrical property of the oxide is getting changed when a specific gas is exposed from the outside and our sensor can analyze the gas concentration from the variation of quantity.
 

The Personalized Gurdian Against Drink Driving  

Compact, accurate, reliable, smart looking and easy to use.  

CA2010 & CA2000 can be taken everywhere you go to help prevent drink driving and binge drinking.  

CA2010 & CA2000 use the state-of-art oxide-semiconductor sensor and its test result is UNAFFECTED by COLA, COFFEE & SMOKING, which are  commonly consumed with alcoholic beverage.  

CA2010 & CA2000 are an unique & highly-sophisticated alcohol analyzer utilizing the  variation of electrical property value of the oxide-semiconductor when the  alcohol substance is detected. And, with the development of new ceramic  material combined with relevant catalyst, it can selectively analyze the alcohol  concentration to the ppm unit existing in the human breath.   

Our laboratory made it in developing the highly-selective semi-conductive  sensor reactive to alcohol substance only, which can be differentiated from the other semi-conductive sensor products (which are often affected by the other substances like smokes and smells of food). Furthermore,it did improve to the large extent the standby,response & recovery time which could be crucial in measuring gas concentration.