Description
Hydrogen gas sensor is a sensor that function to measure gaseous compounds in air pollutants, like carbon monoxide, hydrocarbons, nitrooksida, and others. Already been circulated in the market more and more semiconductor gas sensing. Of course, distinguished by the sensitivity of the sensor, the more expensive the better the sensitivity. Gas sensing is working with the higher concentration of the gas then the lower the resistance. There are so many types of gas sensors are used and commercially available, such as gas sensors to detect LPG gas ie 2610 and TGS-type gas sensors to detect cigarette smoke that is type AF 30. In this pembahsan discussed are Gas sensor Type AF-30.
AF 30 Hydrogen sensors
AF sensor 30 is a sensor that can detect smoke and hydrogen. This type of smoke sensors are generally divided into 3 kinds of ionization smoke detectors, photoelectric smoke detector, and water-sampling smoke detector. The difference of the three types of smoke detectors are only on the method of detection.
AF sensor 30 is a gas sensor that works to detect gases Hydrogen and Ethanol. AF-30 sensor has a high sensitivity level of the two types of gas.
If these sensors detect the presence of these gases in the air with the level of the sensor will assume there is smoke in the air. When the sensors detect the presence of these gases serve targeted the electrical resistance of the sensor will go down. By utilizing the principle of sensor AF-30, the content of these gases can be measured. The figure below is a graph of the sensitivity of the sensor AF-30 against both the gas concentration.
From the graph above can be seen that by measuring the ratio between the resistance of the sensor when there is gas and the sensor resistance in clean air or gas does not contain the (Rgas / Rair), can be known levels of the gas. For example if the sensor resistance (RS) at the time there is 1KW and Hydrogen gas sensor resistance (RS) at the time of 10KW of clean air is then:
From the above calculation and according to the graph in Figure 1, if Rgas / R water = 0.1, then
Hydrogen gas concentration in air is about 100ppm. To know the size of the sensor resistance (RS) during the clean air can be calculated using the formula:
Application
Schematics hydrogen sensor :
Source :
