SU104912A1 - Mercury ohmic pressure sensor - Google Patents

Description

The subject of the invention is a pressure sensor, perceived by a mercury column, on which a metal float floats, covering the wire tensioned in the measuring tube of the sensor and forming an ohmic resistance.

In order to ensure the reliability of such a sensor and the contact between the float and the wire, it is proposed to strengthen the spring contacts that are in contact with the wire on the float.

FIG. 1 shows the proposed float-type ohmic pressure sensor in vertical section; in fig. 2 - a float in two projections.

The sensor is a measuring tube /, which, like the reservoir 2 of the sensor, is made of Plexiglas, which makes it possible to monitor the state of mercury and the absence of air in the tube when charging the sensor. The upper end of the measuring tube is closed by a cover 3 with a contact

rod 4 having a hook at the end. A contact rod 5 is introduced into tank 2. The tank bottom 6 is attached through a gasket 7. A nipple 8 is provided in the tank for connection to the measured vacuum line. In the center of the measuring tube 9 there is a tension nikhromov thread, the upper end of which is connected to the current lead rod 4, and the lower end - to the spring 10, which is fixed on the open end of the measuring tube. The spring provides the necessary tension on the thread. It passes through the axial channel of the steel float.

11, on the upper part of which two contact springs are reinforced

12, ensuring reliable contact of the float with the thread and not preventing it from moving along the latter, since the installation moment of the float considerably exceeds the contact pressure of its springs. In addition, the springs when moving the float clean the thread

from mercury raids. The required amount of pressure of the springs is adjusted by screws 13 securing the springs to the float. The presence of springs and the special configuration of the float, ensuring its sufficient contacting surface with both wire and mercury, allows for a clear unambiguous dependence of the total resistance of the sensor on the position of the float in the measuring tube.

Subject invention

Mercury ohmic pressure sensor with an electrically conductive float on the surface of mercury, covering the wire tensioned in the measuring tube of the sensor and forming an ohmic resistance, characterized in that, to ensure reliability and stability of the float contact with the -wire, springs are fixed on the float contact with wire.