The core component of the alcohol detector is an alcohol sensor. When the testee blows through the test mouthpiece to the alcohol detector, the alcohol detector reacts to the exhaled gas through the alcohol sensor. Therefore, the quality of the alcohol sensor affects the detection of alcohol. Instrument test accuracy.
Alcohol sensor types and differences:
At present, only fuel cell type (electrochemical type) and semiconductor type are widely used. These two types can be manufactured into a portable breath alcohol tester, which is suitable for on-site use. Semiconductors are basically used in the civilian market. Electrochemical types are basically used in law enforcement traffic police departments. In foreign countries, the use of electrochemistry is wider.
The semiconductor type uses a tin oxide semiconductor as a sensor. Such a semiconductor device has gas sensitivity characteristics. When the concentration of sensitive gas in the contact gas increases, the external resistance value thereof decreases, and the semiconductor type breath alcohol tester utilizes this principle. Made of. This semiconductor has different sensitivity to different gases at different operating temperatures. Therefore, the semiconductor-type breath alcohol tester uses a heating element to heat the sensor to a certain temperature. At this temperature, the sensor is applied to alcohol. Has the highest sensitivity.
The fuel cell type breath alcohol tester uses a fuel cell alcohol sensor as a gas sensor, which belongs to the electrochemical type and is also called an electrochemical type. The fuel cell is an environmentally friendly energy source that is currently being extensively researched around the world. It can directly convert combustible gas into electrical energy without causing pollution. Being an alcohol sensor is just a branch of the fuel cell. The fuel cell alcohol sensor uses precious metal platinum as the electrode. It is filled with a special catalyst in the combustion chamber. It can fully convert the alcohol entering the combustion chamber into electrical energy. That is, voltage is generated on the two electrodes, and the electrical energy is consumed on the external load. This voltage is directly proportional to the alcohol concentration entering the combustion chamber. This is the basic working principle of the fuel cell type breath alcohol tester.
Basic information table:
Compared with the semiconductor type, the fuel cell type breath alcohol tester has the advantages of good stability, high precision, and good anti-interference. Unfortunately, due to the structural requirements of the fuel cell alcohol sensor is very sophisticated, and the manufacturing difficulty is quite large, currently only a few countries in the United States and Europe can produce. Because of its high material cost (equivalent to several dozen times that of the semiconductor alcohol sensor), the price is quite expensive, resulting in the fact that the price of the fuel cell type alcohol tester is several times that of the semiconductor type alcohol tester.
Shenzhen Gongcai.com recommends Japanese imported alcohol sensor: Japan figaro alcohol sensor TGS2620
First, the alcohol sensor TGS2620 descriptionSensitive elements consist of an integrated heater and a metal oxide semiconductor on an alumina substrate. When gas is detected in the air, the higher the concentration of the gas, the higher the conductivity of the sensor. Using a simple circuit, the change in conductivity can be converted to a signal output corresponding to the gas concentration. TGS2620 is highly sensitive to organic solvents and other volatile gases. Most suitable for organic solvent gas detectors. Due to the small size of the sensitive element, the TGS2620 requires only 42 mA of heater current and the housing is in a standard TO-5 metal package.
Second, alcohol sensor TGS2620 features:* Low power consumption
* High sensitivity to ethanol and organic solvents
* Long service life and low cost
* Simple application circuit
* small volume
Third, alcohol sensor TGS2620 application:* Ethanol detector
* Detector and alarm for detecting organic solvents
* Solvent detectors for factories, dry cleaners, semiconductor industry
Fourth, alcohol sensor TGS2620 sensitivity characteristics:The typical sensitivity profile is measured under standard test conditions as shown below.
The ordinate represents the sensor resistance ratio Rs/Ro, and Rs and Ro are defined as follows:
Rs = resistance of the sensor in various concentrations of gas
Ro = resistance of the sensor in 300ppm ethanol
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