SU653561A1 - Thermoelectric system electric measuring device - Google Patents

Description

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The invention relates to electrical measuring equipment and can be used to monitor and measure direct current.

Thermoelectric measuring instruments are known that contain a heater, a thermocouple, and a magnetoelectric device connected to thermocouple 1}.

Such devices are complex and not sensitive to the direction of the measured current.

Electrical measuring instruments for a thermoelectric system comprising a transparent capillary tube located along the scale and communicating with a cavity filled with liquid 2 are also known.

Such devices are simple in design, but not sensitive to the sign of the measured current, since the heating of the fluid in the cavity does not depend on the direction of the current in the heater.

The aim of the invention is the expansion of functional potentials due to sensitivity to the sign of the flowing current.

This goal is achieved by the fact that in an electrical measuring instrument of a thermoelectric system containing a transparent capillary tube, located along the scale with a zero in the middle and communicating with a cavity filled with liquid, the cavity is filled in the form of a flat conducting box divided into two parts by a wall which are filled with liquid different colors and communicate with the different ends of the capillary, the liquid of different colors is divided into a capillary by a drop of another nec 4 of the sewing liquid, a meter is applied to the opposite sides of the box ny contacts that form

5 with a box of two different thermocouples.

The drawing schematically shows an electrical measuring device of a thermoelectric system.

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The device contains a flat conductive box 1, divided by a thin wall 2 into two parts 3 and 4, filled with a multi-colored liquid 5, for example, water antifreeze with the addition of any coloring matter. Measuring contacts 6 and 7 are applied to the box, to which a measuring current is applied, which form two different polarities with the material of the box.

Claims (2)

0 thermocouples, such as copper and bismuth. The reading device is made in the form of a transparent capillary 8, filled with the above-mentioned liquid which is separated by a droplet 9 of a liquid that is not miscible with it, for example, with oil, and which is connected to opposite parts of box 1, and the scale 10 with zero in the middle. The device works as follows. In the absence of a measurable current, the temperature of measuring contacts 6 and 7 is the same, fluid 5 is in cavities 3 and 4 of membrane box 1, and droplet 9 of separating liquid is at the zero point of scale 10. When the measured current passes through pin 6 in the direction indicated in the drawing, it allocates a certain amount of heat. At the same time, in contact 7, in accordance with the Peltier effect, the same amount of heat is absorbed. In this case, the liquid. In one part 4 is cooled, and in the other part 3, as it flows, it expands and enters the capillary 8, as a result of which the droplet 9 is displaced from the zero position of SCR1LY. If you change the direction of the measured current, the trip contacts 6 and 7 will switch roles, and droplet 9 will shift from c in the opposite direction. Moreover, the selection of Joule heat in the membrane box does not displace the droplet 9 from the zero scale, so. as the temperature change of both contacts 6 and 7 is the same, and therefore the expansion is the same. liquids 5 in parts 3 and 4 of box 1. As the Peltier heat is proportional to the magnitude of the current passing through the junction, the scale of the proposed measuring device can be calibrated directly in units of the measured current. Thus, the device shows both the magnitude and direction of the current, the current, which expands its scope. The invention The electrical measuring instrument of a thermoelectric system comprising a transparent capillary tube located along the scale with zero in the middle and communicating with the cavity,. filled with liquid, characterized in that, in order to expand functionality due to sensitivity to the sign of flowing current, the cavity is made in the form of a flat conducting box divided by a wall into two parts, which are filled with liquid of different colors and communicate with different ends of the capillary, a liquid of different colors is divided in the capillary droplets of another immiscible liquid, measuring contacts are placed on opposite sides of the box, forming two different polarized thermocouples with the box. Sources of information taken into account in the examination. 1. Ataman n E.G. and others. Methods and means of measuring electrical quantities. 1974, p.35, fig.2.10. 2. USSR author's certificate 71433 ,. cl. G 01 R 5/24, 07.26.46.