SU800819A1 - Liquid density meter - Google Patents

Description

(54) DEVICE FOR MEASURING LIQUID DENSITY

the tele and the setpoint switch, the coarse is equipped with two elements separated by its height, sensitive to the movement of fluid, and coaxially placed inside the second pipe, while

The cavity between the pipes is isolated from the atmosphere and connected to the controlled

a pressure valve and transducer connected through a pulse driver to a switching setpoint controlled by a valve and a measuring device.

The drawing shows a diagram of the proposed device.

The device for measuring the density contains a setpoint switch I, a controllable pressure valve 2, a pipeline 3, a space 4 between coaxial pipes, an outer coaxial pipe 5, an inner coaxial pipe 6, an upper sensitive element 7, a lower sensitive element (made, for example, as pairs of metal rings), a common external electrode 9, a tube, a pulse shaper 1O comprising a detector II (for example, a capacitive bridge circuit, a diode circuit, etc.), an amplifier 12, Schmidt trigger 13 and a pulse generator 14, and the key device 15 (e.g. a relay, a semiconductor integrated circuit diagram), the pressure transducer 16, an electrical signal schetnoregistriruyushy device 17.

The device works as follows.

Under the influence of the setpoint switch I, the gas pressure valve 2 is activated. From the outlet of the valve, gas under pressure through pipe 3 enters the space 4 formed by the cavity between the two coaxial pipes outer 5 and inner 6. Under pressure, the fluid in space 4 is expelled from there by cycles. The movement of fluid is carried out with respect to two sensitive elements located at predetermined levels.

The upper sensitive element 7 as well as the lower sensitive element 8 is formed, for example, by pairs of metal rings placed on the outer surface of the inner tube 6, each of which, together with the common electrode 9 of the outer tube, forms a discrete capacitor. The outputs of the pairs of discrete capacitors are connected to the input of the detector II driver 10 pulses.

Each pair of capacitors operates in such a way that if one ring is in a liquid and the other is in air, then a shaper of pulses is given a signal +1. If both poles are immersed in a liquid or both in air, then a signal O is output at the output of the pulse former. The E-sensitive sensors are included in the shoulders of the capacitive bridge of the detector II. When using another type of sensitive elements, the detector circuit 11 has a different solution.

From the output of the detector 11, the signal is fed through the amplifier 12 to the input of the Schmidt trigger 13. From the output of the pulse former, the signal is fed to the input of the shotgun device 15, the second input of which is connected to the output of the converter 16. The electrical signal in the form of a voltage, digital code or frequency of pulses through the key device 15 is fed to the input of the counted register 17

gives on its indicator board the value of the density of the liquid as a result of the pressure difference at two points in the liquid column.

At the end of the pressure pulse, the fluid refills space 4.

After the lower sensing element 8 triggers, a signal after some time equal to or greater than the filling time of the column liquid is formed by the pulse former U and ensures that the new measurement cycle starts by supplying a new pressure pulse to space 4. The signal from the imaging unit 10 resets the information of the previous measurement cycle in the counting device 17.

Claims (2)

Invention Formula A device for measuring the density of a liquid, comprising a vertical pipe and a measuring device, so that it is aimed at increasing accuracy of measurement and expansion of functionality; it is equipped with a controllable pressure valve, a pressure transducer into an electrical signal, a pulse shaper, a switch and a setpoint switch, the pipe is equipped with two sensitive elements placed on its height to fluid movement and coaxially located inside the second pipe. at the same time, the cavity between the pipes is isolated from the atmosphere and is connected to a controllable pressure valve and a transducer connected via a pulse shaper to a switching setpoint controlled by a valve and a measuring instrument. Sources of information taken into account in the examination I. Vnktcherov c. A. and Lukin B.V. Changes in the quantity and density of various media. M., Energie, 1973, p. 36 2. Ibid., From 44-45.