High-precision differential pressure type liquid level measurement device and application thereof

Abstract

The invention relates to a high-precision differential pressure type liquid level measurement device and application thereof. The measurement device comprises a container requiring liquid level measurement, a transmitter, a positive-pressure chamber pressure guide pipe and a negative-pressure chamber pressure guide pipe. A positive-pressure chamber of the transmitter is communicated with a lower end of the container requiring liquid level measurement through the positive-pressure chamber pressure guide pipe, and a negative-pressure chamber of the transmitter is communicated with a high end of the container requiring liquid level measurement through the negative-pressure chamber pressure guide pipe. The highest end of the negative-pressure chamber pressure guide pipe is externally connected with a negative-pressure chamber liquid injection pipe, the highest end of the positive-pressure chamber pressure guide pipe is externally connected with a positive-pressure chamber liquid injection pipe, and each of the negative-pressure chamber liquid injection pipe and the positive-pressure chamber liquid injection pipe is provided with a plug or a check valve. Before use of the measurement device, the positive-pressure chamber, the negative-pressure chamber, the positive-pressure chamber pressure guide pipe and the negative-pressure chamber pressure guide pipe are filled with a to-be-tested liquid medium through the negative-pressure chamber liquid injection pipe and the positive-pressure chamber liquid injection pipe. Compared with the prior art, the high-precision differential pressure type liquid level measurement device has advantages that influences on measurement accuracy due to backflow of the positive-pressure chamber pressure guide pipe can be counteracted, and accordingly influences on instrument measurement due to technical production fluctuation can be counteracted.

Description

technical field [0001] The invention relates to a liquid level measuring device, in particular to a high-precision differential pressure liquid level measuring device and its application. Background technique [0002] Differential pressure level gauges are widely used in chemical companies and can measure the liquid level of various media. But sometimes, the impact of process fluctuations will directly cause deviations in the level gauge. When measuring the liquid level of the water seal of a flare tank, the measured medium is water, and the water level will fluctuate, sometimes even to the full tank. When the liquid level gauge is measured, the static pressure of the liquid is introduced into the transmitter through the pressure guide tube of the positive pressure chamber, while the negative pressure chamber is open to the atmosphere. When the liquid level of the tank changes, the positive pressure chamber of the transmitter will feel The pressure will change, and the liq...

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Problems solved by technology

Therefore, when the tank is full, the liquid level will be inaccurate, and the poured water will never be discharged, resulting in inaccurate when the tank is not full.

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