SU16303A1 - Electric meter - Google Patents

Description

in instruments for measuring current, consisting of a heating thread through which the measured current passes through and thermocouples giving an electromotive force when the place is heated, the combination of two metals making up this pair. The heating wire and thermocouple wires are usually of very small diameter (about 0.015 MLz) and welding or soldering them presents great difficulties. In such devices, thermocouple wires are not welded together, but also welded or soldered to the heating filament; This is done to achieve reliable electrical and thermal contact, but at the same time reduces the sensitivity of the device, as it increases the surface that cools the junction.

The proposed electrical connection relates to an electrical measuring device using prisoners enclosed in a glass tube, a heating filament and a thermocouple, and aims to increase the sensitivity of the instrument by avoiding the welding of a thermocouple with body heat.

In FIG. 1 and 2 depict the view of the proposed measuring device from two sides; FIG. 3-in a highly magnified scale, the junction of the thermocouple and the heating filament, without supporting conductors.

The thermocouple wires wi, w, consisting of two dissimilar metals, are welded at the site m (Fig. 3). I sleep a thermocouple, 1 the heating thread is not welded to the junction, the measured current is passed through it, and which is pulled off by the thin spring and conductor 9 supporting the heating thread and yielding Its current, as well as the conductors 9i, supporting the thermocouple r and diverting from it, are welded in the same leg of the amplifying lamp (of the type “Micro”) and brought out either to the pins in the usual base or in a special box to the corresponding terminals.

The maximum sensitivity of the device is achieved only after training, which means that the glowing glow SAO red k, the current flow for some time, as a result, reliable and good thermal contact of the heating thread and the thermocouple is obtained, and the absence of soldering or welding of the heating thread, which thickens and increases the section at the point of contact with the tertiop & pbj, increases the sensitivity of the device.

 A: Pre patent patent.

An electrical measuring device using a heating filament and a thermal pair enclosed in a glass flask, characterized in that the thermocouple passed through the junction is w, t, and the heating filament is not welded to the junction by means of a thin spring n attached to the connecting conductor. .

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Fig.5

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