Partially filled pipe detection circuit of electromagnetic flowmeter

An electromagnetic flowmeter and detection circuit technology, which is used in the measurement of flow/mass flow, liquid/fluid solid measurement, and measurement devices, etc. Fast response speed, stable and reliable detection performance, and the effect of reducing interference

Inactive Publication Date: 2017-04-26
中船环境工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the object of the present invention is to provide a part-full pipe detection circuit of an electromagnetic flowmeter to solve the existing defects of slow response speed, unstable part-full pipe detection, and low reliability.

Method used

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  • Partially filled pipe detection circuit of electromagnetic flowmeter
  • Partially filled pipe detection circuit of electromagnetic flowmeter
  • Partially filled pipe detection circuit of electromagnetic flowmeter

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Embodiment Construction

[0019] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given to describe the embodiments in conjunction with the accompanying drawings.

[0020] In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the invention.

[0021] see figure 1 shown, combined with Figure 2...

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Abstract

The invention provides a partially filled pipe detection circuit of an electromagnetic flowmeter. The partially filled pipe detection circuit comprises a CPU drive signal waveform transforming circuit, a first-grade passive lowpass filtering circuit, a differential signal amplification circuit, an active power filter circuit, and an absolute value transforming circuit. One end of the CPU drive signal waveform transforming circuit acquires high-frequency pulse signals, and the other end is connected with the first-grade passive lowpass filtering circuit. The first-grade passive lowpass filtering circuit is connected with the differential signal amplification circuit. A voltage follower circuit in the active power filter circuit is connected with a second-order active high-pass filtering circuit. The differential amplification circuit is also connected with the voltage follower circuit. The second-order active high-pass filtering circuit is connected with the absolute value transforming circuit. The absolute value transforming circuit outputs detection signals. A [pi] type filter circuit formed by a RC is used in the input end of a differential operational amplifier, and the [pi] type filter circuit can effectively filter spike noise caused by liquid flow when pipes are partially filled, so as to reduce interference. The partially filled pipe detection circuit is advantaged by real-time online monitoring, fast response speed, relatively good noise inhibiting ability, stable and reliable detection performance.

Description

technical field [0001] The invention relates to a detection circuit, in particular to a non-full pipe detection circuit of an electromagnetic flowmeter. Background technique [0002] At present, the existing circuit superimposes the detection signal on the circuit path of the flow measurement signal, uses an analog switch to switch the selection in time, and sends an excitation signal with a pulse width every 20S, so the dynamic response is very slow. When the full pipe state changes to the non-full pipe state, the detection response speed is very slow, the partial pipe detection is unstable, and the reliability of the partial pipe detection is very low. When the electromagnetic flowmeter is not full, the medium in the pipe cannot completely fill the pipe , so there is a part of the air inside, when the liquid in the pipeline flows, the spike noise in the pipeline will be very loud, and the spike signal may submerge the detection signal. The measurement condition of the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/60
CPCG01F1/60
Inventor 刘海鑫张小峰邓建清师光辉严帅严冲冲
Owner 中船环境工程有限公司
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