[New patent introduction] A magnetic liquid level transmitter

Today, I will introduce a national invention authorized patent-a magnetic liquid level transmitter. The patent was applied for by Hubei Hongyuan Instrument Manufacturing Co., Ltd., and the authorization was announced on March 13, 2018.

Content description

The invention relates to the field of liquid level measuring instruments, in particular to a magnetic liquid level transmitter.

Background of the invention

Petrochemical and other fields often use level gauges to measure the liquid level of the liquid medium in the container. The types of level gauges include tuning fork vibration type, maglev type, pressure type, ultrasonic, sonar wave, magnetic flap and radar. Among them, the maglev type liquid level gauge is mainly used for liquid level measurement in the fields of petroleum processing, food processing, chemical industry, water treatment, pharmaceuticals, electric power, papermaking, metallurgy, ships and boilers. The magnetic float level gauge has a top-mounted float level gauge and a side-mounted float level gauge, which can be equipped with a remote transmission level transmitter to realize the digital/analog display of the remote transmission of the liquid level signal.

Liquid level transmitters are divided into input type, straight rod type, flange type, thread type, inductive type, screw-in type, and float type. Its installation is simple and convenient to use, high sensitivity, fast response, and high measurement accuracy; The working principle of the position transmitter is that when the two pressures of the measured medium enter the high and low pressure chambers, they act on the isolation diaphragms on both sides of the sensitive element, and are transmitted to the measurement diaphragm through the isolation diaphragm and the filling liquid in the element. On both sides; the liquid level transmitter can convert the transformation of various level parameters into standard current signals, which are transmitted to the control room for centralized display or automatic control by the computer. It is widely used in detection and control in various industrial processes.

But for the long-range liquid level measurement, generally the segmented liquid level transmitter is often used; for example, for the longer-range liquid level gauge, separate liquid levels are installed on the upper, middle and lower parts of the liquid level gauge. Transmitter, each level transmitter inputs a 4-20mA current signal separately, and the control display system connected to it will receive three measurement results. Because the three measurement results are relatively independent, the entire liquid level cannot be continuously monitored and displayed. The signal of the meter is very inconvenient to use, and the measurement accuracy is relatively poor.

Summary of the invention

In view of the existing problems, the present invention provides a magnetic liquid level transmitter, the main purpose of which is to solve the problem of using a segmented liquid level transmitter for long-range liquid level measurement, which cannot realize continuous monitoring of liquid level signals.

In order to achieve the above objective, the technical solution adopted by the present invention is as follows: On the one hand, an embodiment of the present invention provides a magnetic liquid level transmitter, including: a magnetic floating liquid level meter and a liquid level transmitter. The Sensor of the transmitter is fastened to the outside of the main tube of the magnetic levitation liquid level gauge; the liquid level transmitter includes a type A liquid level transmitter that is electrically connected to the sensor and the connector, and a B that is electrically connected to the sensor and the converter. Type liquid level transmitter; multiple A type liquid level transmitters and one B type liquid level transmitter are arranged in sequence along the axial direction of the liquid level gauge; the outlet end of the previous type A liquid level transmitter and its phase The inlet end of the next A type liquid level transmitter is electrically connected; the inlet end of the B type liquid level transmitter is electrically connected to the outlet end of the adjacent previous A type liquid level transmitter; B The outlet end of the liquid level transmitter is electrically connected to the control system to realize continuous display of the liquid level signal.

The shape of the sensor is L-shaped, and the connector or converter is electrically connected to the bend end of the L-shaped sensor. The connector is a terminal block. The connector is arranged in an explosion-proof junction box, and the converter is arranged in an explosion-proof junction box with a liquid crystal display on the surface. The number of Type A liquid level transmitters is 1-5. The magnetic float level gauge is a side-mounted UHZ-A magnetic level gauge, and the level transmitter is a bundled remote transmitter. The measuring range of the magnetic liquid level transmitter is 250mm-20000mm, the accuracy is ±10mm, the output signal is two-wire 4-20mA HART protocol, the ambient temperature is -40℃～60℃, and the explosion-proof grade is intrinsically safe ib IICT4. The outlet interface of the B-type liquid level transmitter is internal thread. The liquid level gauge is of a segmented type, and a plurality of liquid level gauges are sequentially connected along the axial direction through a connecting pipe. The control system is a microcomputer industrial intelligent control instrument.

Compared with the prior art, the beneficial effect of the present invention is that: in view of the technical problem that the magnetic liquid level transmitter cannot continuously monitor and display the signal of the entire liquid level gauge, the present invention adopts the output resistance of each A type liquid level gauge and the B type The technical means that the output resistance of the level gauge is connected in series and the series resistance is converted into the final current signal in the B-type level gauge converter can achieve the beneficial effect of multi-segment continuous and accurate monitoring and display of the entire level gauge signal.

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