Control method for automatically switching measuring ranges of electromagnetic flowmeter

An automatic switching and electromagnetic flow technology, which is applied in the application of electromagnetic flowmeters to detect fluid flow, volume/mass flow generated by electromagnetic effects, etc., can solve the problems of easy aging, large driving current, slow movement, etc., to overcome large volume, The effect of simple method

Inactive Publication Date: 2013-10-02
ZHONGHUAN TIG
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Disadvantages such as large drive c

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  • Control method for automatically switching measuring ranges of electromagnetic flowmeter
  • Control method for automatically switching measuring ranges of electromagnetic flowmeter
  • Control method for automatically switching measuring ranges of electromagnetic flowmeter

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[0013] Below in conjunction with accompanying drawing, the present invention will be further described: with reference to figure 1 , figure 2 and image 3 , this method uses a single-chip microcomputer to make a ratio between the current instantaneous flow rate and the range set by the instrument, and judge the range percentage of the current flow rate. If it is less than a certain percentage, the range switching is performed, and the current value corresponding to the new range is output. Another signal line transmits a signal level (high level or low level) to the DCS control system, telling the control system that the range has been switched, and the DCS control system also resets the range set by itself to be consistent with the electromagnetic range. The same range as the flowmeter.

[0014] In this method, the switching point of the upstream traffic is set to 50%, 25% or 12.5%, and the switching point of the downstream traffic is set to 45% (50%-5%), 20% (25%-5%) or ...

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Abstract

The invention relates to a control method for automatically switching measuring ranges of an electromagnetic flowmeter. The control method comprises the following steps of: firstly, setting a measuring range switching ratio according to the accuracy requirement of a flow rate, calculating and judging whether a first measuring range or a second measuring range is currently used by the measuring range switching ratio, and when the second measuring range is used, multiplying a reciprocal of the measuring range switching ratio by a current instantaneous flow rate value and then converting the obtained value into a current value of 4 to 20mA; and when the first measuring range is used, carrying out no calculation and directly converting the current instantaneous flow rate value into a current value of 4 to 20mA. The method is simple, stable, safe and reliable so as to replace a conventional mode of adopting switching of relays to select the measuring range, and the defects of large volume, large driving current, low acting speed, easiness for aging and the like of the conventional mode are overcome.

Description

technical field [0001] The invention relates to an electromagnetic flowmeter, in particular to a control method for automatically switching ranges of the electromagnetic flowmeter. Background technique [0002] The flow information measured by the electromagnetic flowmeter can be transmitted to the user in a variety of ways, the simplest is to directly observe the display of the electromagnetic flowmeter converter; in addition, in the DCS (distributed control system), the output signal of the electromagnetic flowmeter must be After a long distance, it is transmitted to the control system that is not installed with the flowmeter. At this time, the most commonly used is the transmission of 4-20mA current. The electromagnetic flowmeter converts the measured flow rate information into a corresponding current signal. , and then transmitted to the remote control system through the signal line, the control system is set to the same range as the electromagnetic flowmeter, and...

Claims

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Application Information

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IPC IPC(8): G01F1/58
Inventor 唐琦富陈维琨陈会庆高明璋张志明
Owner ZHONGHUAN TIG
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