JPS60263853A - Detector for concentration of hydrogen or steam in gas - Google Patents

Abstract

PURPOSE:To prevent the crack occuring in thermal expansion by forming a solid electrolyte element into a tubular shape closed at one end, providing respectively electrode layers to the outside and inside surfaces thereof and connecting the electrode layer on the outside surface and the electrode layer on the inside surface via a plug body provided to the instrument for the purpose of attaching the element. CONSTITUTION:The plug body 4 is attached to a measuring gas chamber 2 and the proton conductive solid element 3 made into the tubular shape closed at one end is fitted therein. The element 3 is made of strontium oxide, cerium oxide, etc, and detects hydrogen or steam. The electrode layers 8, 9 are respectively provided to the outside and inside surfaces of the element 3. The electrode layer 8 on the outside surface of the element 3 is brought into contact with the measuring gas and the electrode layer 9 on the inside surface is brought into contact with a standard gas. The electromotive force EMF owing to a difference in the concn. between the hydrogen or steam is detected. The layer 8 is connected to the body 4 and the layer 9 to the terminal 5 in the aperture of the element 3 to generate the electromotive force. The crack occuring in the thermal expansion of the instrument is thus prevented and the sealability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydrogen or water vapor concentration detector in gas using an element mainly composed of strontium oxide or cerium oxide.

Conventionally, as this type of detector, one having the structure shown in FIG. 1 is known. According to this conventional structure, since the glass packing/S is a thermal packing, it is A/20 due to the influence of heating and cooling during manufacturing and use.
．． Due to the difference in thermal expansion between the porcelain tube and the proton conductive element 2, cracks were likely to occur and the sealing performance was incomplete.

In addition, the connection between the outer electrode layer /3 and the conductor /B or the connection between the inner electrode layer /3 and the conductor /B is because each electrode layer is thin, and the conductor /B is not fixed and is free, so a small amount of There were also times when he was absent from filming. As described above, the conventional structures had various drawbacks, and were still at the experimental and research stage and were insufficient for practical use.

Therefore, the purpose of this invention is to solve these problems and provide a practical detector that is inexpensive, has stable performance, and has excellent durability.This invention is shown in Figure 2 of the drawing. An example of the structure shown will now be described in detail.

/ is a detector, and a stopper ≠ is screwed into a gas chamber wall 10 surrounding the measurement gas chamber 2. The element 3 held by the stopper t has a tubular shape with an annular protrusion on the outer periphery and one end closed, and one end protruding into the measurement gas chamber 2 is hermetically closed, and the other end is open. A terminal S for the inner surface electrode is fixedly connected to the inner surface electrode layer 9. In addition, an outer electrode layer g and an inner electrode layer 9 made of platinum or the like are baked and coated on a part of the outer surface and the inner surface of the element 3, respectively, and these electrode layers g and 9 are coated with gas on the inner surface of the element 3. It is designed to be porous so that it can come into contact with the The outer electrode layer is electrically connected to the stopper t through a conductive gasket 6. However, the electrode layer is not applied by baking on the outer surface 7 protruding from the plug l, but rather a neck portion // is provided, and the shape is such that it is electrically non-conductive with the inner electrode terminal S. Further, the inner surface electrode layer 9 is baked and coated on the entire inner surface of the element f3, and is connected to the inner surface electrode terminal j. Then, an electromotive force logarithmically proportional to the ratio of the hydrogen or water vapor concentration in the measurement gas to the hydrogen or water vapor concentration in the standard gas is generated between the plug body and the inner electrode terminal.
It is configured to occur between. Note that 7 is gas care).

Since this invention has a vaporized structure, it can eliminate cracks caused by the difference in thermal expansion of conventional thermal glass gaskets, solve problems such as sealing properties, and furthermore, can solve the problems of connection between the electrode layer and the lead wire. It has excellent effects such as being able to solve problems such as qualitative problems. Furthermore, in connection with the measurement gas chamber, compared to the conventional connection between a metal gas chamber wall and a porcelain tube, the present invention has a structure that is extremely simple and has good sealing performance.

[Brief explanation of drawings]

FIG. 1 is a plan view of one longitudinal chamber of the main part of a conventional detector)) FIG. 2 is a longitudinal cross-sectional view of the main part of an embodiment of the present invention. /1. Detector, 2...Measuring gas chamber, 3...Element, t...
Plug body!・・Terminal for inner electrode, ・Conductive gasket, 71. Gasket,...outer surface electrode layer, 9...inner surface electrode layer, IO,, gas chamber wall, //...neck, 7.2...element: i3. /3'...Outer surface. Inner m] Electrode layer, /l/-...Porcelain tube, 15...Glass barragin, /B...Conductor wire, 111 d Fig. 2

Claims (1)

[Claims] In a hydrogen or water vapor concentration detector in gas using a proton-conductive solid electrolyte element mainly composed of strontium oxide or cerium oxide, the element is shaped like a tube with one end closed and has an annular protrusion on the outer periphery and is attached to a metal stopper. The outer electrode layer of the element is pressed into contact with the plug through a conductive gasket to maintain electrical contact, and the inner electrode layer of the element is not electrically connected to the plug. It has a neck shape, and electrical connection is made by separately bonding a terminal for the inner electrode to the opening of the element, so that the inner electrode layer can be contacted with the standard gas and the outer electrode layer can be contacted with the measurement gas. A hydrogen or water vapor concentration detector in gas, which is characterized by: