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Gas sensor
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An oxygen sensor and oxygen technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problem of large sensor size
Active Publication Date: 2008-10-01
RAE SYST SHANGHAI
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Although this kind of sensor is not easy to lose water, in order to ensure that the measuring electrode and the counter electrode can contact the acid electrolyte solution in various placement methods, a lot of electrolyte solution must be filled in the liquid storage tank, resulting in a large volume of the sensor
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example 1
[0106] Example 1: For a 4R sensor, its cross section is 8×10 -5 m 2 , when the liquid electrolyte, that is, the pore cross-sectional area of the interlayer occupies 50% of the cross-sectional area of the sensor, A 液相 =4×10 -5 m 2 , using formula (17)A 液相 / l 隔层 入口 / l 入口 )6.5×10 3 Calculated
[0107] 4×10 -5 / l 隔层 -6 ×6.5×10 3
[0108] as long as l 隔层 >7.7×10 -4 m, that is, the thickness of the liquid electrolyte is greater than 0.77 mm, and the oxygen diffused to the measuring electrode through the liquid layer can be neglected.
example 2
[0109] Example 2: For a 4R sensor, its cross section is 8×10 -5 m 2 , when the liquid electrolyte, that is, the pore cross-sectional area of the interlayer accounts for 1% of the cross-section of the sensor, it can be calculated using formula (17)
[0110] 0.01×8×10 -5 / l 隔层 -6 ×6.5×10 3
[0111] as long as l 隔层 >1.5×10 -5 m, that is, the thickness of the liquid electrolyte is greater than 15 microns, and the oxygen diffusion through the liquid layer to the measuring electrode can be neglected.
[0112] (b) Regarding the second term A in formula (16) 泄漏 / l 隔层
[0113] In addition, it is also necessary to consider that the oxygen from the counter electrode side penetrates the liquid layer in the form of bubbles and reaches the measurement electrode. Generally speaking, if the resistance of the liquid layer to the gas is greater than the gas pressure on the side of the counter electrode, the gas will not penetrate the liquid layer to reach the measuring electrode, an...
example 1
[0125] Example 1: In an extreme case, if the cross-sectional area of the hole, that is, the exposed area of the liquid layer accounts for 50% of the cross-sectional area of the sensor, that is, the diameter of the hole is 7 mm, and the thickness of the liquid layer is 0.77 mm, then
[0126] l 出气孔 / d 出气孔 4 8
[0127] Assuming that the length of the vent hole is 1 mm, the diameter of the vent hole needs to be greater than 1.5 mm.
[0128] Example 2: In another extreme case, if the cross-sectional area of the hole, that is, the exposed area of the liquid layer accounts for 1% of the cross-sectional area of the sensor, that is, when the diameter of the hole on the interlayer is 1 mm and the thickness of the liquid layer is 15 microns,
[0129] l 出气孔 / d 出气孔 4 10
[0130] At this time, when the length of the air outlet is 1 mm, the diameter of the air outlet needs to be greater than 0.56 mm.
[0131] It can be seen that when using a liquid electrolyte as an elect...
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Abstract
The present invention provides an oxygen sensor which comprises the following components: an electrolyte interlayer (110) which is provided with at least one through hole; a measuring electrode (112) which is arranged at one side of the electrolyte interlayer; and a counter electrode (114) which is arranged at the other side of the electrolyte interlayer. The dimension of at least one through hole satisfies the following relationship: A<liquid phase> / l<interlayer> <6.5*10<3>(A<entry> / l<entry>), wherein A<liquid phase> is the total sectional area of at least one through hole, l<interlayer> is the thickness of the through hole, A<entry> is the sectional area of the air inlet hole, and A<entry> is the length of the air inlet hole. The through hole can comprise a hydrophilic liquid-absorptionmaterial. The position is departed from the electric field formed by the measuring electrode and the counter electrode. The electrolyte interlayer can also be a hydrophilic micropore array formwork. In the oxygen sensor of the invention, the electrolyte interlayer structure which is provided with at least one through hole not only can be taken as an ion conductor for communicating the measuring electrode with the counter electrode but also can prevent the reverse diffusion of the oxygen. At the same time, the prepared oxygen sensor not only has excellent interference resistance but also has the advantage small volume.
Description
technical field [0001] The invention relates to a gas sensor, in particular to an electrolytic gas sensor and an electrolytic oxygen sensor. Background technique [0002] The electrochemical oxygen sensor is a sensor widely used to monitor oxygen. US Patent No. 4,132,616 describes a galvanic oxygen sensor. During work, oxygen diffuses to the measuring electrode through a capillary hole, combines with water and electrons there, and undergoes a reduction reaction to form hydroxide ions. Hydroxide ions flow through the electrolyte to the counter electrode, where they react with the lead electrode to form lead oxide, water and electrons. The movement of hydroxide ions between the measuring electrode and the counter electrode creates a current that is proportional to the percent concentration of oxygen. Thus, the oxygen concentration can be known by measuring the current. [0003] US patent application US 2005 / 0034987 describes an electrolytic oxygen sensor, the key component...
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