Discrete sensor

 

(57) Abstract:

The inventive discrete sensor provides speed measuring pipe, at each step with a pressure sensor, the input of which is connected to the input of the processing unit, the plate of magnetically sensitive material and the magnets, each of which is arranged to be placed under a corresponding pressure sensor or the above steps, and each plate of magnetically sensitive material is sensitive element of the corresponding pressure sensor. 3 Il.

The invention relates to the instrument and can be used to measure with precision fluid levels of various types using a uniform sensor information.

Known probe, float, capacitive, inductive, resistive and thermoelectric sensors (Morehow N. A. Automatically measuring volume, level and porosity of the materials. M. Energoatomizdat, 1990, S. 120).

Closest to the invention is a discrete sensor containing the measuring pipe of stepped form with placed it in the water level, the outputs of the sensors are connected to the corresponding inputs of the processing unit. To adjust the sensitivity on the sensing element of the sensor information from the inner side secured a sealed tank filled with substance, the weight of which is less than the specific gravity of the liquid. Additionally inside the sealed container is a heating element.

The disadvantages of this sensor is limited functionality due to the fact that this sensor can measure levels of liquids withewhereethe weight of the reference liquid; specific gravity of the liquid, as used uniform pressure sensor will produce a signal of the logic unit when it reaches a certain levelethe reference liquid withe.

The task of the invention is the extension class of the measured liquids of any class by measuring the level of liquids witheorewhen using a standard pressure sensors without changing the level measurement limits.

For this purpose, a discrete sensor that contains the speed of the measuring tube, at each step which has datchery plate of magnetically sensitive material and the magnets, each of which is arranged to be placed under a corresponding pressure sensor or the above steps, and each plate of magnetically sensitive material is sensitive element of the corresponding pressure sensor.

The invention consists in that when measuring liquid level <>eabove the upper level of the measuring tube to create aeupon reaching the liquid of any class levele(distance between steps).

Distinctive features of the proposed invention are:

introduction plates from magnetocrystalline ferromagnetic material located on the sensing element of the pressure sensor;

the introduction of magnets;

the execution of the magnet with the possibility of installation under the appropriate pressure sensor or located underneath the stage.

In Fig. 1 shows a diagram of the sensor with the location of the magnets under pressure sensors; Fig. 2 is the same, with the arrangement of the magnets above the pressure sensors of Fig. 3 the scheme of fixing the magnets in an extra plane having a speed-increasing form.

Discrete sensor contains izmeritelnaya the fluid being measured, N sensors 2 information block 3 information processing, plate 4 made of ferromagnetic material and the magnets 5. When the measuring pipe 1 has a step of increasing the shape, the height of each step is proportional to the accuracy of the level measurement, the sensor 2.i (i 1-N) information is located on the bottom surface of the i-th stage of the pipe 1 below the top surface of the i-th stage of the pipe 1, the output of the sensor 2 information connected with the respective input unit 3 of the information processing, on the upper surface of the sensing element of the sensor 2. i information are in place (e.g., adhesive) plate 4.i magnetosensitive (ferromagnetic) material. Under the pressure sensor 2.i installed the magnet (magnet) 5.i.

Discrete transmitter depicted in Fig. 2, differs from the discrete sensor is depicted in Fig. 1, so that the magnet 5.i installed on top of the pressure sensor 2.i above the level of the pipe 1.

If the sensor 2 pressure has an electric output signal which is equal to a logical unit when the leveleliquids with a specific gravitye(sensor 2 pressure relay of the type, in unit 3, you can use digital to analogue Converter (DAC).

To the output of block 3 data processing (Fig. 1, 2) can be connected to the node display (voltmeter or ammeter, Fig. 1, 2 site display not illustrated), calibrated in units of length.

Instead of magnets, 5.1, 5.N you can use one long (linear) magnet, located at the same distance of the plates 4. The length of the magnet 5 in this case should not be less than straight-line distance between the first and N-th plate 4. Place the magnet 5 is inclined at a certain distance l from the straight line connecting the first and N-th plate. The distance l depends on the technical implementation of the magnet 5 (electromagnet), including power from its power source.

Discrete sensor operates as follows.

The sensors 2. i (i 1-N) is selected so as to output the logical unit after the complete filling of the i-th stage of the measuring tube 1 heighteliquid with specific gravitye.

Suppose that the level of the liquid is changed and at some point of time will fill the i-th stage of the pipe 1. This will trigger the sensor 2.the first information output signal is rebrushed evidence of triggered sensors (2.1, 2.2, 2.i information in the analog signal, which is input to node indication, the indication which is proportional to the height level of the liquid.

For variation sensitive standard sensors 2 information for level measurement of liquids with different specific gravities using magnetic forces. If <ethe magnets 5 have a bottom sensor 2 pressure at a certain distance to create a force of attraction between the magnet 5 and the plate 4.

Pm(e)eS RPLwhereethe distance between the rungs of the pipe 1 (specified accuracy of the measurement); and S the area of the sensitive element of the pressure sensor; the specific weight of the fluid being measured;ethe weight of the reference (standard) fluid; PPLweight plates 4.

If the magnet 5 is made in the form of an electromagnet, to adjust the strength of the Pmby variation of the power voltage at a given distance between the plate 4 and the magnet 5 and the specified number of turns of the magnet.

If >ethen use a level gauge (Fig. 2) with the upper position of the magnet 5. In this case, the magnets 5 must create a force between them and the plates 4 Rm(eSe+ Pthe bones using a standard pressure sensors with the same range of level measurement;

it is easier to control the sensitivity of the standard pressure sensors by using the strength of the magnetic field;

provides contactless control sensitivity, which leads to the use of this sensor for the measurement of ultra-pure or explosive liquids.

DISCRETE SENSOR containing speed measuring pipe, at each step with a pressure sensor, the output of which is connected to the input of the processing unit, characterized in that it introduced the plates of magnetically sensitive material and the magnets, each of which is arranged to be placed under a corresponding pressure sensor or the above steps, and each plate of magnetically sensitive material is sensitive element of the corresponding pressure sensor.

 

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