SU273460A1 - Level gauge - Google Patents

Description

The present invention relates to the field of measurement technology, in particular to the field of measuring the level of liquid media using float devices.

The known level gauges containing a float with a coil located in it, moving along a guide with inductive coils distributed on it, and an oscillator with an oscillating circuit, do not have sufficient accuracy and reliability due to the presence of a bulky kinematic scheme.

The proposed level gauge differs from those known in that the float coil in it is placed in a ferromagnetic cylinder made, for example, of permallo, and connected to an RC load, and the inductive guide coils are divided into groups corresponding in height to the ferromagnetic cylinder and the groups are included in the oscillatory circuit of the oscillator.

FIG. Figures 1 and 2 show the kinematic and electrical schematic diagrams of the level described, respectively.

The level gauge contains a coding mask 1, which simultaneously performs the role of a guide, a float 2, inside of which is placed a cylinder 3 of ferromagnetic material with

the coil 4 built into it, loaded onto the RC load 5, and the electric circuit 6. The height of the ferromagnetic cylinder and the distance between the coils 7 of the inductance of the coding mask are chosen so that at zero liquid level the cylinder simultaneously covers m inductive coils. With an increase in the level of the liquid, the float moves along the guide upwards and the ferromagnetic cylinder simultaneously covers the hp + 1 inductive coils. In the next position, it again covers the m inductive coils. Thus, but as the float moves, a ferromagnetic cylinder occupying new positions will simultaneously cover m or m + 1 inductive coils of the coding mask. At the same time, a group of inductive cutters of the mask mask, in which at least one inductance coil is covered by a cylinder with an integrated circuit, due to the presence of losses due to induced EMF

in its inductance coil, will have a low Q-factor, and a group where no coil is covered by a cylinder - an increased Q-factor.

and (the quality factor increases or decreases) of the coil group of only one bit of the coding mask. Therefore, at the output of the converter, a code is obtained with a sequential change of one unit.

The electrical circuit of the level converter into the code is constructed so that the groups of inductive coils of the individual mask bits are connected in series to the oscillatory circuit of the autogenerator assembled on the TO transistor by means of transistor switches; collected on the Tj-T transistors. which are controlled by the yomosh on the interrogator 8 (Fig. 2). In the initial state, the interrogator is in zero position, and all keys are locked. With the command to measure, the dispenser of the polling device is started, and the last from zero position goes to the first. At the same time, the key assembled on the transistor Tj is opened, and the group of coils of the first discharge of the encoding mask is connected to the oscillating circuit of the autogenerator. If at this time one of the coils is covered with a ferromagnetic cylinder with a built-in contour, due to the presence of energy loss of the oscillating circuit, the auto-oscillator self-excitation conditions are violated, and the binary signal is removed from the generator 9. If the AI one of the coils of this group is not blocked by a ferromagnetic cylinder, then the auto-oscillator self-excites, and with

The output of the converter for this bit is a binary signal of zero.

Subsequently, the interrogator moves to the next position, the electronic keys collected on the transistors are alternately opened, and the oscillating circuit of the oscillator, respectively, is connected to the group of inductive coils of the remaining mask bits. The generation of code signals for any bit of the converter occurs in the same way as described above. With the arrival of the switch to the initial (zero) state, the code acquisition cycle is complete.

Claims (1)

Invention Formula A level meter containing a float with a coil placed in it, intermixing along a guide with dual inductors distributed on it, and an oscillator with an oscillating circuit, differing in the fact that, in order to increase accuracy, reliability and simplify the design, .m the float coil is placed in a ferromagnetic cylinder made, for example, from permallo, and is connected to an RC load, and the inductive guide coils are divided into groups corresponding in height to the ferromagnetic cylinder and are included in groups in the oscillator oscillator frequency circuit.