DE531685C

DE531685C - Weston normal element

Info

Publication number: DE531685C
Application number: DEW84416D
Authority: DE
Original assignee: Weston Electric Instrument Corp
Current assignee: Weston Electric Instrument Corp
Priority date: 1929-12-05
Filing date: 1929-12-05
Publication date: 1931-08-14

Description

DEUTSCHES REICHGERMAN EMPIRE

AUSGEGEBEN AM
14. AUGUST 1931ISSUED ON
AUGUST 14, 1931

. REICHSPATENTAMT. REICH PATENT OFFICE

PATENTSCHRIFTPATENT LETTERING

KLASSE 21b GRUPPECLASS 21b GROUP

Weston-Normalelement Patentiert im Deutschen Reiche vom 5. Dezember 1929 abWeston normal element Patented in the German Empire on December 5, 1929

Bei dem Weston-Normalelement, wie es zur Zeit hergestellt wird und welches als Elektrolyt eine Kadmiumsulfatlösung und als Elektroden Kadmiumamalgam und Quecksilber aufweist, ist es üblich, ein Depolarisationsmittel, beispielsweise eine Merkurosulfatpaste, direkt in Berührung mit dem Quecksilberpol zu verwenden. Bei derartigen Normalelementen war es üblich, den flüssigenIn the case of the Weston standard element as it is currently manufactured and which as Electrolyte a cadmium sulfate solution and as electrodes cadmium amalgam and mercury it is common to use a depolarizing agent, for example a mercury sulfate paste, to use directly in contact with the mercury pole. With such normal elements it was common to use the liquid

ίο Elektrolyten von dem Kadmiumamalgam bzw. der Depolarisationspaste durch poröse Zwischenwände oder Diaphragmen zu trennen, um eine Vermischung beider beim Transport zu verhindern. Derartige, oberhalb derίο electrolytes from the cadmium amalgam or to separate the depolarization paste by porous partitions or diaphragms, to prevent the two from mixing during transport. Such, above the

Depolarisationspaste angeordnete, poröse Diaphragmen sind natürlich nicht geeignet, eine Vermischung der Paste mit dem darunter befindlichen Quecksilber zu verhindern, vielmehr wurde beobachtet, daß sich das Quecksilber und das Merkurosulfat allmählich im Laufe der Zeit miteinander vermischen infolge der Erschütterungen, welche beim Versand und bei der Benutzung auftreten. Hierbei kann das Merkurosulfat gelegentlich mitPorous diaphragms arranged with depolarization paste are of course not suitable for a To prevent mixing of the paste with the mercury underneath, rather it was observed that the mercury and the mercury sulfate gradually in the Mix with each other over time due to the vibrations that occur during shipping and occur during use. Mercury sulphate can occasionally be used

«5 der Platinstromzuleitung des Quecksilberpoles in Berührung gelangen.«5 of the platinum power supply line of the mercury pole come into contact.

Eine derartige Berührung übt jedoch eine zerstörende Wirkung auf das Element aus, indem eine viel geringere und veränderliche elektromotorische Kraft erzeugt und auch der innere Widerstand des Elements beträchtlich vermehrt wird und eine wesentliche Verkürzung der Lebensdauer eintritt.Such contact, however, has a destructive effect on the element, by generating a much lesser and variable electromotive force and also the internal resistance of the element is increased considerably and a substantial shortening the service life occurs.

Die Erfindung bezweckt eine Verbesserung des Normalelements, so daß beim Gebrauch ein Abfall der elektromotorischen Kraft und eine Erhöhung des inneren Widerstandes vermieden und die Lebensdauer beträchtlich verlängert wird, ohne in irgendeiner Weise den Wert des Elements als Normalelement zu beeinträchtigen.The invention aims to improve the normal element so that in use a decrease in electromotive force and an increase in internal resistance avoided and the life span is considerably extended without in any way affect the value of the element as a normal element.

Die Verbesserung besteht in der Vorsehung von Hilfsmitteln, durch welche eine Berührung des Merkurosulfats mit dem Stromzuführungsdraht vermieden wird und auch ein Abwärtskriechen des Merkurosulfats in das Quecksilber in der Nähe des Platindrahtes, während eine Berührung zwischen Quecksilber und Merkurosulfat ermöglicht wird, sowie deren freie Vermischung oberhalb und in einer gewissen Entfernung vom Zuführungsdraht. The improvement consists in the provision of aids through which one touch of the mercury sulfate with the power supply wire is avoided and also a downward creep of the mercury sulfate into the Mercury near the platinum wire, while touching between mercury and mercury sulfate, as well as their free mixing above and at a certain distance from the lead wire.

Die Erfindung soll nunmehr an Hand der Zeichnung näher erläutert werden.The invention will now be explained in more detail with reference to the drawing.

Fig. ι stellt einen Längsschnitt durch ein Weston-Normalelement des sogenannten Η-Types dar,Fig. Ι represents a longitudinal section through a Weston normal element of the so-called Η-types,

Fig. 2 einen vergrößerten Teilschnitt durch die Sicherung gemäß Fig. 1;FIG. 2 shows an enlarged partial section through the fuse according to FIG. 1;

Fig. 3 und 4 zeigen Teilschnitte durch abgeänderte Formen der Sicherung.3 and 4 show partial sections through modified forms of the fuse.

Gemäß Fig. 1 besteht das Normalelement aus dem bekannten H'förmigen Glasbehälter 1 mit den beiden eingeschmolzenen Platinzuführungen 2. In den linken Schenkel A des Behälters ist das Kadmiumamalgam. 3 eimgefüllt sowie ein Porzellanhalter 4 mit poröser Packung 5. Die Quecksilberelektrode 6 befindet sich in Berührung mit dem Platindraht 2 am Boden des Schenkels. Um eine ununterbrochene und wirksame Betätigung des Elements zu gewährleisten, ist es notwendig, einAccording to FIG. 1, the normal element consists of the known H'-shaped glass container 1 with the two fused platinum feeds 2. The cadmium amalgam is in the left leg A of the container. 3 filled in and a porcelain holder 4 with a porous packing 5. The mercury electrode 6 is in contact with the platinum wire 2 at the bottom of the leg. In order to ensure uninterrupted and effective operation of the element, it is necessary to have a

Claims

Depolarizing agent, namely mercury sulfate, in contact with the mercury electrode 6 to use. This mercury sulfate is labeled 7 and is located in the usual paste form.

The essential feature of the invention consists in the provision of aids, called a fuse, in the right leg B of the container to keep the mercury sulfate out of contact with the platinum wire and to separate it from the mercury near the platinum wire, but not free mixing of the depolarizing agent with it to prevent the mercury inside and above the fuse. One embodiment of such a fuse is illustrated in FIGS. 1 and 2 and consists of a cork disc 8 with a comparatively large opening 9 in the middle, a piece of cloth 10, for example made of silk, muslin and the like, which extends across the opening and is stretched around the edge of the disc.

The disc 8 with the cloth covering 10 is tightly inserted into the leg of the vessel correct position fitted, and sufficiently above the power supply line 2, however below the mercury sulfate. The disc can even be a little below the Mercury level 6, as indicated in Fig. 1 is indicated. In any case, the lock washer should be arranged so that all mercurosulfate is retained from the vicinity of the power supply line 2, while a free mixing of the mercury and the mercury sulfate is made possible. It was found that a locking washer according to FIGS. 1 and 2 brings about this result, since the mercury can freely pass through the disc and the mesh of the fabric to to mix with the mercury sulfate located above, but that the latter after can get down below the cutting disc.

The element has the usual electrolyte 11 from a cadmium sulfate solution, and the upper openings of the legs are, as indicated at 12, sealed in the usual way.

3 and 4 show another embodiment of a suitable fuse. According to FIG. 3, this consists of a cork disc 13 with a wide bore 14, wherein the cork washer on the 'housing 1. is set, but the fabric cover is omitted became. It has been found that this form of formation is mercury sulfate with success above withholds and still the necessary mixing of the mercury allowed with the sulfate paste through the opening 14 through.

The same result can be achieved by the fuse according to FIG which the vessel 1 is provided with an inner annular flange 15 which has an opening 16 having. It is clear that the fuse can be formed on the vessel wall as shown in FIG can, or that it can be removed from the vessel wall itself by a suitable constriction of the same can be formed.

Form the forms of security shown in all figures Transverse walls in vessel 1 and successfully hold the mercury sulfate paste above the one below located mercury even with the heaviest vibrations of the element.

Each of the forms of training described represents an embodiment of the in the claims used the expression »aids which point inwards from the vessel walls to extend ”, and all forms of training show that a direct Downward creeping of the mercury sulfate along the vessel wall is prevented.

The invention is described in connection with an H-shaped Weston standard element but it is clear that it is not limited to this particular vessel shape. Other embodiments of the fuse can also be used, with only the The only essential thing is that there is good electrical and chemical contact between the mercury electrode and the mercury sulfate, while the latter and also the cadmium sulfate above and away from the metal power supply being held.

I? A ΊΈΝ T Λ N S PRÜCEE:

ι. Weston normal element, its mercury electrode is covered with mercury sulfate as a depolarizer and is in contact with a metallic power supply stands, characterized by an arranged between the depolarizer mass and the power supply, in particular A diaphragm made of a fine-meshed fabric.

2. Weston normal element according to claim i, characterized in that the Diaphragm is arranged below the mercury level.

3. Weston normal element according to claim ι and 2, characterized in that that the diaphragm consists of a fine-meshed fabric covered, drilled cork disc.

1 sheet of drawings