A plug-in electromagnetic flowmeter

Abstract

The invention relates to an insert-type electromagnetic flowmeter comprising an insert-type flow sensor and a converter; the insert-type flow sensor comprises a detection head, an insert rod, a mount flange and a junction box; the detection head and the insert rod are respectively a cylindrical body; an excitation coil, an iron core, a lead wire and two pairs of electrodes contacting with fluid are arranged in a cylindrical cavity of the detection head; one end of the insert rod is connected with the junction box, and the other end is connected with the detection head; the mount flange is welded on the middle upper portion of the insert rod, and used for fixing and sealing the insert type flow sensor; the input terminal of the converter is connected with the output terminal of the wiring box. The insert-type electromagnetic flowmeter can serve as a calibration regulator so as to carry out online calibration for a filed large diameter flowmeter.

Description

Technical field [0001] The invention relates to a plug-in electromagnetic flowmeter for online calibration of a large-caliber flowmeter on site and a flow measurement model thereof. Background technique [0002] At present, when performing on-line calibration of on-site large-caliber flowmeters, the clamp-on ultrasonic flowmeter is usually used as the standard meter comparison method or electrical parameter verification method of the calibration standard. However, neither of the above two methods can well realize the "online" calibration of on-site large-caliber flowmeters. The problems are as follows: ①Due to the limitation of field conditions, it is difficult to convert the external clamped ultrasonic flowmeter as a calibration standard. The detector is installed in place on the field measuring pipeline. When installing the transducer of the clamp-on ultrasonic flowmeter on the field measurement pipeline, it is necessary to accurately measure the wall thickness and outer circu...

AI Technical Summary

Problems solved by technology

The reduction of the induced electromotive force will greatly affect the flow measurement effect of the plug-in electromagnetic flowmeter, and even the flow measurement cannot be realized

Usually, due to the limitation of on-site installation conditions, it is difficult to install the measuring electrode pair of the insertion type electromagnetic flowmeter at a position perpendicular to the flow direction of the conductive liquid. Therefore, the insertion type electromagnetic flowmeter under the existing technical conditions has an insurmountable Defects, it cannot be used as a calibration standard for the calibration of on-site large-caliber flowmeters, so the plug-in electromagnetic flowmeter under the existing technical conditions cannot be used as a calibration standard to achieve the standard meter comparison method to complete the on-site large-caliber flow meter calibration

[0004] Due to the above-mentioned many defects in the external clip-on ultrasonic flowmeter and the insertion electromagnetic flowmeter under the existing technical conditions as the standard table comparison method or the electrical parameter inspection method of the calibration standard, they cannot be well realized on-site. "On-line" calibration of flowmeters, so there is an urgent need for a new type of calibration standard for on-site calibration of large-diameter flowmeters to replace the current external clamp-on ultrasonic flowmeter and the insertion electromagnetic flowmeter under the existing technical conditions as a calibration Standard table comparison method or electrical parameter inspection method of standard device

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