SU418734A1 - - Google Patents

Description

one

The invention relates to the testing technique and can be used to determine the position of the interface between two media.

In the known devices, for determining the position of the interface between two media, discrete level sensors — electrodes — a measuring circuit are used that transform the signals of the electrodes when the liquid-electrode circuit closes into information about the level value.

The disadvantage of such devices is the low accuracy of measurements with fluctuations of the level and low speed.

The aim of the invention is to improve the measurement accuracy and speed of the device.

This goal is achieved by introducing a decoder and prohibition schemes into the gage, which uninterruptedly decode the level sensor signals in any number system.

The decoder is built in such a way that the output of each level sensor is connected to a numeric bus only of the decoder bit whose weighting factor corresponds to the given sensor, and only to the numeric bus of the selected bit, the number of which is assigned to the sensor in the selected number system .

The outputs of the numeric bus bits through the amplifiers are connected to the inputs of the inhibit circuits, the outputs of which are connected to the indicator bits corresponding to the given numerical bus, and to the inhibit inputs of all other circuits connected to the sensors, the weighting coefficients of which correspond to the lower bits. And in each bit, the output of the numeric bus is connected to the inhibiting inputs of the inhibit circuits connected to the sensors corresponding to the smaller numbers in the bit.

Such a construction of the decoder allows us to simplify the circuit, since the number of amplifiers of sensor signals is equal to the number of buses, and not the number of sensors, to obtain a constant accuracy

measurement over the entire measurement range and reduce the time to convert sensor signals to digital code.

The drawing shows a diagram of the gauge. The gauge contains level sensors 1-1G;

prohibition schemes 17-40; amplifiers 41-48, low-end numeric tires 49-52, and high-resolution numeric spikes 53-56.

The sensors are located in the measurement range evenly, in increments equal to twice

the magnitude of the measurement error.

3.4

Each sensor is assigned a digital value to this sensor in the selected system.

level code of the level from the reference point, for example:

418734

Table 1

Each bus corresponds to a given digital code value, for example;

The gauge works as follows.

The movement of the working medium 57, for example, in the direction from sensor 1 to sensor 8, causes the appearance of a signal on each of them. In this case, the signal from sensor 6 corresponding to digital code 20 (see table 1) through the prohibition circuit 22 and the high-resolution numerical pad 54 corresponding to code 20 (see table 2) is fed to the input of amplifier 46, the signal of which closes the prohibition circuit 18 , 21 and 37, thereby crossing the signals of the sensors 2-5 to the inputs of the 49–52 junior digit numbers, passing the signal of the numerical level 53 of the older digit. At the same time, the signal of amplifier 46 through the circuit 38 is shut off and is fed to an indicator device, for example, to an electrode of a gas discharge indicator lamp.

Similarly, the code for the position of the interface and for the younger category is obtained. Since the movement of the working medium 57 causes the sensor signals 1–8 to successively appear, and the inhibitory circuits 23–26 are open, the signal of the sensor 8 is blocked through the circuit 23 and the low-order numerical band 50 arrives at the input of the amplifier 42, the signal of which prevents the signal from passing numeric bus 49, which is connected to the sensor 7, through the prohibition scheme 34 to the indicator device.

table 2

Thus, a code is obtained for the position of the interface between the two media, expressed as two digits.

Subject invention

The level gauge contains discrete level gauges, a measuring device and an indicator, characterized in that, in order to increase accuracy and speed, the measuring device is made in the form of a descrambler containing two groups of prohibition circuits, numeric tires and amplifiers; each level sensor through the corresponding prohibition scheme of the first group is connected to

the numeric spike of the corresponding bit of the decoder connected through an amplifier and the corresponding prohibition scheme of the second group with the indicator digit corresponding to the level specified by this sensor

the selected number system; and the output of the amplifier of each higher-order number field is connected to the second inputs of the prohibition circuit of the first group of low-order sensors and the second input of the prohibition circuit of the lower-order per unit numerical bus of the same bit.

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THE YEAR

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