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Explosion-proof sensor

一种传感器、传感器元件的技术，应用在防爆传感器领域，能够解决制造过程复杂等问题，达到减轻张力、防止金属销钉弯曲的效果

Inactive Publication Date: 2011-05-11
DRAGER SAFETY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although known gas sensors have a high compressive strength due to the individually arranged glass inserts, the manufacturing process is relatively complex

Method used

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Embodiment Construction

[0020] The single FIGURE shows a longitudinal sectional view of a gas sensor 1 in which a catalytically active sensor element 3 and a catalytically inactive sensor element 4 are fastened to metal pins 5 , 6 , 7 in a sensor housing 2 . For the intake air, the upper side of the sensor housing 2 is closed in a known manner with a porous, gas-permeable disk made of sintered metal material. The metal pins 5, 6, 7 are accommodated by a flat glass insert 9, wherein the glass insert 9 is surrounded by an annular metal base 10, with which a gas-tight seal with the sensor housing 2 is established by means of weld seams 11. connect. The free ends of the metal pins 5 , 6 , 7 on the underside of the glass insert 9 are provided with input lines 12 , 13 , 14 which establish the connection to the evaluation unit 15 . On the top and bottom of the glass insert 9 there is a cast / injection part 16 , 17 each made of ceramic material with a thickness of 6 mm. The first cast / injection part 17 on t...

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Abstract

An explosion-proof sensor for detecting combustible gases is provided with a glass seal (9) for establishing an electrically conductive connection with the interior of the housing. The sensor is improved in terms of the pressure resistance of the housing. The glass seal (9) has a bending-resistant casting compound (16, 17, 18) mechanically stabilizing the glass seal (9) on at least one side.

Description

technical field [0001] The invention relates to an explosion-proof sensor, for example for detecting combustible / toxic gases or smoke. Background technique [0002] For the detection of combustible / toxic gases, for example, a gas sensor is used, which contains a catalytic converter, which is heated to a predetermined temperature, so that the combustible gas is in the sensor while consuming a part of the oxygen present in the test gas. Burns off catalytically on the surface and in doing so increases the temperature of the sensor. The increase in sensor temperature that occurs during the combustion reaction is evaluated as a measurement signal for the gas concentration in the air mixture to be detected. [0003] To carry out the measurement, a catalytically active sensor element and a passive sensor as a balancer are usually arranged in a bridge half-circuit, the passive sensor being used to balance the influence of the ambient temperature. Bridge imbalance is a measure of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N27/16G01N33/0009
Inventor M·施利希特B·朗格
Owner DRAGER SAFETY
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