Gas sensor

A gas sensor and external gas technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of inability to miniaturize and large structure of the gas sensor, and achieve the effect of fewer structural parts, fewer process steps, and simpler assembly.

Active Publication Date: 2012-08-15
RAE SYST SHANGHAI
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  • Abstract
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Problems solved by technology

[0004] However, the structure of the above-mentioned

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[0030] The present invention will be further described below with reference to specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0031] figure 1 The cross-sectional structure diagram of the gas sensor of this embodiment is shown. The gas sensor mainly includes: a casing 122, a casing cover 124, a bracket 127, a plug 125, a measuring electrode 112, a first liquid absorbing material layer 144a, and a counter electrode 114, In addition, it also includes a second liquid absorbing material layer 144b, a reference electrode 116, a first breathable waterproof membrane 142a, a second breathable waterproof membrane 142b, a dustproof membrane 126, and a third breathable waterproof membrane 142c.

[0032] The materials of the casing 122, the casing cover 124, the bracket 127 and the plug 125 may be plastic. The outer shape of the casing 122 is cylindrical or approximately cylindrical. After the gas sensor o...

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Abstract

The invention provides a gas sensor, which comprises a shell, a measuring electrode, a support, a counter electrode, a plug and a shell cover. The top of the shell is opened, the bottom of the shell is provided with a flange, and perforative pores are arranged on the bottom wall of the shell in a region surrounded by the flange; the measuring electrode is disposed in the region surrounded by the flange, and external gas reaches the measuring electrode via the pores; the top and the bottom of the support are opened, the support hermetically matches with the flange, and the measuring electrode is fixedly clamped between the shell and the support; the counter electrode is disposed in the support, and a first liquid absorbing material layer is arranged between the counter electrode and the measuring electrode; the plug is provided with an air outlet hole, and the first liquid absorbing material layer and the counter electrode are fixedly clamped between the support and plug; and the shell cover is provided with an opening, the shell cover is detachably connected with the top of the shell, and the opening hermetically matches with the plug and is communicated with the air outlet hole. Miniaturization of the gas sensor is realized, and the gas sensor is compact in structure and fine in liquid leakage prevention property.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a miniaturizable electrochemical gas sensor. Background technique [0002] Electrochemical gas sensor is a kind of sensor widely used to monitor gas at present. The U.S. patent No. US4132616 describes a galvanic oxygen sensor. When the oxygen sensor is working, oxygen diffuses to the measuring electrode through the capillary pores, and combines with water and electrons at the measuring electrode to undergo a reduction reaction to form hydroxide radicals. Ions, hydroxide ions flow through the electrolyte to the counter electrode and react with the lead electrode to form lead oxide, water and electrons. The magnitude of the current formed between the measuring electrode and the counter electrode is proportional to the percentage concentration of oxygen. [0003] A Chinese patent application with application number CN200710038443.X discloses an amperometric oxygen sensor. When the sensor is workin...

Claims

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Application Information

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IPC IPC(8): G01N27/403
Inventor 刘玲朱伟峰苏爱民周华方
Owner RAE SYST SHANGHAI
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