Device for measuring the level of conductive liquids

 

(57) Abstract:

Usage: in measurement technology for measuring fluctuations in the level of conductive liquids in tanks, vessels, reservoirs, sewers, etc. of the invention: device for measuring the level of conductive liquids containing sensitive element connected to the recording unit, connected to the display unit and the power source, the sensing element is made in the form of a series of rings of conductive wire, placed on a dielectric cylinder with a step defined by the formula l = 2-d , where d is the wire diameter, mm; - measurement error, mm, the step between the dielectric cylinder is placed a layer of waterproof material, such as grease, and the recording unit contains a sliding contact and step elements connected respectively with a number of rings of the sensing element, and the dielectric cylinder can be made flexible. 2 C.p. f-crystals, 3 ill.

The invention relates to measuring technique and can be used to measure fluctuations in the level of conductive liquids in tanks, vessels, reservoirs, canals, sewage, etc.

A device to measure the three separated by insulators electrodes. The first electrode connected to one pole of the power source, the second to one input terminal of the relay device, the second input terminal of which is connected to the second pole of the power source (see and.with.The USSR N315047, CL GO1F 23/22, 1971).

A disadvantage of this device is the low reliability that is associated with the occurrence of false positives in the formation of the conductive layer on the insulator remain afloat sensitive element in the presence of the object of control vapors and dust.

Closest to the proposed device to the technical essence is adopted as a prototype device for measuring the level of conductive liquids containing sensitive element connected to the recording unit, connected to the display unit and power supply (see and.with.The USSR N323665, CL GO1 F 23/24, 1970).

The disadvantage of this device is the high measurement error when working with viscous adhesive paste-like conductive environments, due to the constructive execution of sensitive elements that sticks environment that contributes to a false signal.

The technical result of the invention is to improve the accuracy of izmereniya level of conductive liquids containing the sensing element is connected to the recording unit, connected to the display unit and the power source, the sensing element is made in the form of a series of rings of conductive wire, placed on a dielectric cylinder with a step defined by the formula:

l = 2-d

where d is the wire diameter, mm;

measurement error, mm,

the step between the dielectric cylinder is placed a layer of waterproof material, such as grease, and the recording unit contains contact and step elements connected respectively with a number of rings of the sensing element, and the dielectric cylinder can be made flexible.

In the study of the technical level of the proposed solution was not found technical solutions, which have characteristics similar to the proposed solution on the basis of what can be considered that the proposed solution meets the criterion of "technical level".

The essence of the proposed solution is illustrated by drawings, where Fig.1 depicts a block diagram of the proposed device for measuring liquid level, and Fig. 2 shows a longitudinal section of a flexible dielectric cylinder with sensitive elements; fit of the dielectric cylinder 1, and when measuring the level of conductive liquids with large amplitude oscillations (4 m or more) flexible dielectric cylinder, the sensing element 2, made in the form of a series of rings of conductive wire placed in the channels 3 formed annular groove, with the strict execution of the dielectric cylinder 1, with the formation of the stepping intervals 4, functions which perform, when performing dielectric cylinder 1 flexible pieces of rubber hose. The step of placing sensitive elements 2 on the dielectric cylinder 1 is determined by the formula:

l = 2-d (1)

where measurement error, mm;

d is the wire diameter, mm

The derivation of the formula of step placement of the sensing elements.

It is known that measurement error is the deviation of measurements from the true values of the measured value, and the error is the difference x-a, where a is the given number, which is considered as an approximate value of some magnitude, the exact value of which is equal to x.

The difference d=X-a= is called the absolute error (see Soviet encyclopedic dictionary. M. Soviet encyclopedia, 1987, S. 954, 1019).

Assume that the fluid level is on the plane A, Fig.3. Change the awns:

x=a; (1and)

Now suppose that the fluid level is on the plane B, the infinitely small distance from one of the contact rings, it is obvious that in this case the true value of the liquid level will equal:

x=a+l+d (1b)

Let's sum the left and right parts (1and) and (1b)

2x=2a+l+d

2(x-a)=l+d

2=l+d

find the step of placing the sensing element

l=2-d

where measurement error, ml;

d is the wire diameter, Jr.

At step intervals of 4 of the dielectric cylinder 1 and the flexible dielectric cylinder on pieces of rubber hose, is placed a layer of waterproof material 5, such as grease. In the pipe 6, is installed in the liquid 7, posted rigid or flexible dielectric cylinder 1 with the cable 8. For flexible dielectric cylinder 1 within its length, the wire 8 is placed inside the cylinder 1. Stepper contact elements 9 of the recording unit 10 is connected by wires 11 to the connector 12, the cable 13 is connected to the contacts 14 of the sensing element 2 and to the connector 12, lived 15 cable 13 is connected to the pipe 6 and through the connector 12 by a wire 16 to the display unit, such as ohmmeter, 17; power supply wires 18 and 19 are connected to the ohmmeter 17; sliding pin is placed on the dielectric cylinder 1, the scale 24 is placed on the recording unit 10.

When measuring the level of conductive liquids with large amplitude oscillations (4 m or more) dielectric cylinder perform flexible.

The cable 8 throughout the length of the flexible dielectric cylinder 1 is placed in the hose 25.

Flexible embodiment of the device allows to simplify the transportation of long devices, because it is easily assembled and does not occupy much space.

Device for measuring the level of conductive liquid works as follows. The dielectric cylinder 1 in rigid or flexible version installed in the liquid 7 to about half its height. When immersed in controlled liquid regular ring sensing element 2, the signal from the power source 18 passes through the cable 13, the contact 14 is immersed ring sensing element 2 through the liquid 7, the tube 6 is supplied to the recording unit 10. In the absence of evidence on the scale of the ohmmeter 17 sliding contact 20 to a recording unit 10 is moved over the step until the readings on the voltmeter 17, the needle of the sliding contact 20 of the recording unit 10 will show the height from the liquid level to the top end dialektische the knitting cylinder 1 or paste-like conductive substance, located above the fluid level, detected by moving the sliding contact 20 to a recording unit 10 in the direction a number of steps corresponding to the rings of the sensing element 2 located below the liquid level 7. The liquid resistance between the sensor element 2 and the pipe 6 is constant and much smaller kalipeni layers above the liquid level, and thus, knowing the value of the resistance of the fluid between the device and the pipe, you can exclude false testimony by moving the sliding contact 20, to obtain a resistance equal to the resistance value of the liquid, ensuring the reliability of the measurements.

The proposed device for measuring the level of conductive liquids will increase the accuracy and reliability, and to reduce the cost of fabrication and operation.

1. Device for measuring the level of conductive liquids containing sensitive element connected to the recording unit, connected to the display unit and power source, wherein the sensitive element is made in the form of a series of rings of conductive wire placed on the dielectric is Oia, mm

at step intervals of the dielectric cylinder is placed a layer of waterproof material, and the recording unit contains a sliding contact and stepper contact elements connected respectively with a number of rings of the sensing element.

2. The device under item 1, characterized in that the dielectric cylinder is made flexible.

3. The device under item 1 or 2, characterized in that the water-repellent material is a grease.

 

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FIELD: measurement technology.

SUBSTANCE: method can be used for measuring level of liquid and loose materials as well as for measuring distances. Difference frequency spectrum is calculated and its shape is compared with shape of reference spectrum. Reference spectrum consists of permanent and variable parts which are achieved during calibration at working place. Parameters of permanent part of reference spectrum are defined by design of reservoir and kept permanent during process of measurement. Parameters of variable part of reference spectrum are subject to change till achieving minimum of difference measure for measured and reference spectra and are used for calculating distances. Reference spectrum can be formed by means of two ways. According to the first way reference spectrum is calculated from formed reference signal which has to be the sum of partial signals with parameters corresponding to reflections from members of constructions and from measured signal level. Parameters of signals that correspond to reflection from measured level are changed when conducting measurements till achieving minimum of difference measure. According to the second way during process of calibration the permanent and variable parts of spectrum of measured signal are memorized and the measured signal is used as a reference one. Value of measured frequency is the frequency at which difference measure is minimal. For both variants of forming reference spectrum the permanent and variable parts of reference spectrum do not come into interaction.

EFFECT: improved precision of measurement at the presence of background.

8 cl, 4 dwg

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