Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1981-08-19
1984-01-31
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
73 27R, 338 22R, 422 97, 422 98, G01N 316
Patent
active
044289090
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an environmental condition sensor which is used in conjunction with cooking equipment or a gas or petroleum heater or stove so as to detect or sense various environmental conditions such as temperatures, pressures or flow rates under which the equipment is used, thereby controlling the operation thereof.
BACKGROUND ART
Various types of environmental condition sensors have been known. For instance, temperature sensors for sensing temperatures includes thermistors, thermocouples or platinum-wire heat-responsive resistors. When these temperature sensors per se are used as temperature sensors for cooking equipment, they are exposed to smoke, unburned gases such as CO, or carbon vapor so that oil films or soot adhere to the surfaces of temperature sensors and consequently the characteristics of temperature sensors vary. Therefore, temperature sensors have previously been covered with covers such as metallic gauze or the like to prevent the adhesion of oil films or soot. However, these contaminants adhere to the cover itself so that the temperature sensor is isolated from the environmental atmosphere and consequently erratic signals are generated.
DISCLOSURE OF INVENTION
The present invention has for its object to provide an environmental condition sensor in which a sensor is surrounded with a special structure formed with one or more air holes so that smoke or carbon contained in unburned gases contacting the special structure is burned again and evaporated and consequently the adhesion of oil films or soot to the sensor proper can be avoided and the sensor can operate correctly.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view, partly sectional, showing the basic construction of an environmental condition sensor in accordance with the present invention; and
FIGS. 2 and 3 are sectional views of embodiments, respectively, of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
An environmental condition sensor in accordance with the present invention has an environmental condition sensor proper 1 surrounded by a structure 2 which is made of an oxidizing catalyst and has an air hole 2a.
The inventors found out that when the sensor proper 1, such as a temperature sensor, is placed in a cloud of smoke produced in cooking equipment, or the atmosphere of unburned gases generated by an oil stove as shown in FIG. 1, no smoke or carbon will adhere to the sensor proper 1 and subsequent the sensor proper 1 can normally correctly operate. A possible explanation is that the structure 2, which is made of an oxidizing catalyst as shown in FIG. 1, further combusts and evaporates carbon contained in smoke or unburned gases striking the sensor proper 1.
Furthermore, the inventors found out that the structure as shown in FIG. 1 which is made of an oxidizing catalyst has an optimum composition depending upon its use. That is, the structure 2 for the sensor proper 1 which is, for instance, a temperature sensor used in cooking equipment or the like preferably has a composition such as [(.gamma.-MnO.sub.2)+(Zn-Mn-FeO.sub.x)+(mAl.sub.2 O.sub.3.nCao)]. The reason is that at a temperature range between 200.degree. and 300.degree. C. in the interior of cooking equipment such as gas or electric ovens the abovedescribed composition exhibits excellent properties in evaporating smoke or carbon by oxidation or decomposition thereof.
The structure can be fabricated by dry-mixing electrolytic manganese dioxide (.gamma.-MnO.sub.2), a composite oxide of zinc, manganese and iron (Zn-Mn-FeO.sub.x) and alumina cement (mAl.sub.2 O.sub.3.nCao), adding the water, sufficiently wet mixing them and pouring the mixture into a mold.
The inventors further found out the fact that a composition consisting of [(.gamma.-MnO.sub.2)+(Zn-Mn-FeO.sub.x)+(mAl.sub.2 O.sub.3.n CaO)] added with an extremely small amount of platinum metal is effective as the composition of the structure 2 for the sensor proper 1, such as a temperature sensor used in a petroleum or gas stove or heater. F
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patent: 4265724 (1981-05-01), Haecker et al.
patent: 4294801 (1981-10-01), Segawa et al.
Hosomi Fumio
Katase Masazumi
Nishino Atsushi
Wakahata Yasuo
Wasa Kiyotaka
Marcus Michael S.
Matsushita Electric - Industrial Co., Ltd.
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