DE905275C - Thermal ammeter with room temperature compensation - Google Patents
Thermal ammeter with room temperature compensationInfo
- Publication number
- DE905275C DE905275C DEL10064A DEL0010064A DE905275C DE 905275 C DE905275 C DE 905275C DE L10064 A DEL10064 A DE L10064A DE L0010064 A DEL0010064 A DE L0010064A DE 905275 C DE905275 C DE 905275C
- Authority
- DE
- Germany
- Prior art keywords
- room temperature
- vessel
- temperature compensation
- mercury
- display means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 9
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 6
- 229910052753 mercury Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R5/00—Instruments for converting a single current or a single voltage into a mechanical displacement
- G01R5/22—Thermoelectric instruments
- G01R5/24—Thermoelectric instruments operated by elongation of a strip or wire or by expansion of a gas or fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
Gegenstand des Patentes 880 354 'ist ein thermischer Strommesser mit Kompensation der Raumtemperatur, bei dem ein mit dem Anzeigemittel (z. B. Quecksilber) gefülltes, aus einem Material mit gegenüber dem Anzeigemittel kleinem Raumausdehnungskoeffizienten (z. B. Glas) bestehendes Gefäß, das vom zu messenden Strom beheizt wird, mit einem der Raumtemperatur ausgesetzten Kompensationsgefäß mit einem größeren Raumausdehnungskoeffizienten als dem des Anzeigemittels verbunden ist.The subject of patent 880 354 'is a thermal ammeter with room temperature compensation, in which a vessel filled with the display means (e.g. mercury) and made of a material with a smaller spatial expansion coefficient than the display means (e.g. glass), which is heated by the current to be measured, is connected to a compensation vessel exposed to room temperature with a greater spatial expansion coefficient than that of the display means.
Bei der im Patent 880 354 beschriebenen und dargestellten Ausführung ist eine mittelbare Heizung des Meßgefäßes durch eine darumgelegte Heizwendel vorgesehen. Nach der vorliegenden Erfindung wird das flüssige Anzeigemittel, z. B. Quecksilber oder eine andere leitende Flüssigkeit, selbst zur unmittelbaren Widerstandsheizung verwendet. Dies ist wegen der günstigen Leitfähigkeit und des nicht allzu großen Temperaturkoeffizienten der Leitfähigkeit des Quecksilbers möglich. Die Heizung erfolgt in ,diesem Falle unmittelbar an der Stelle der Nutzbarmachung der Wärme, so daß Verluste weitgehend vermieden werden und die Heizleistung entsprechend reduziert werden kann. Das Heizgefäß kann in diesem Falle spiralig oder mäanderförmig ausgeführt werden. Die ,Stromzuführung erfolgt durch Elektroden aus Eisen oder einem anderen geeigneten Material. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.In the embodiment described and shown in patent 880 354, indirect heating of the measuring vessel is provided by a heating coil placed around it. According to the present invention, the liquid display means, e.g. B. mercury or another conductive liquid, even used for direct resistance heating. This is possible because of the favorable conductivity and the not too great temperature coefficient of the conductivity of the mercury. In this case, the heating takes place directly at the point of utilization of the heat, so that losses are largely avoided and the heating output can be reduced accordingly. In this case, the heating vessel can be designed in a spiral or meandering shape. The power is supplied through electrodes made of iron or another suitable material. An exemplary embodiment of the invention is shown in the drawing.
Mit i ist eine gleichzeitig als Heiz- und Meßgefäß dienende Spirale aus Glas, die mit Quecksilber gefüllt ist und an deren Enden die Stromzuführungen 3 und 4 eingeschmolzen sind, bezeichnet. Mit 2 ist das Kompensationsgefäß und mit 5 die Anzeigekapillare bezeichnet. Gemäß der in Fig. 2 dargestellten Abänderung kann das Heizgefäß auch mäanderförmig ausgeführt sein.With i is a spiral that serves as a heating and measuring vessel at the same time made of glass, which is filled with mercury and at the ends of the power supply lines 3 and 4 are melted down, designated. With 2 is the compensation vessel and with 5 denotes the display capillary. According to the modification shown in FIG the heating vessel can also be designed in a meandering shape.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL10064A DE905275C (en) | 1951-09-09 | 1951-09-09 | Thermal ammeter with room temperature compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL10064A DE905275C (en) | 1951-09-09 | 1951-09-09 | Thermal ammeter with room temperature compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE905275C true DE905275C (en) | 1954-03-01 |
Family
ID=7258276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL10064A Expired DE905275C (en) | 1951-09-09 | 1951-09-09 | Thermal ammeter with room temperature compensation |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE905275C (en) |
-
1951
- 1951-09-09 DE DEL10064A patent/DE905275C/en not_active Expired
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