Detection method for Coriolis mass flow meter
A mass flow meter, mass flow technology, applied in the direction of direct mass flow meter, mass flow measurement device, etc., can solve the problem of large error in the measurement data of the mass flow meter, and achieve the effect of eliminating noise interference and high measurement accuracy
Active Publication Date: 2011-08-17
SHANGHAI YINUO INSTR
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[0011] The present invention includes that the mass flow transmitter receives the periodic sine waves generated by the two detection components, sends them to the measurement circuit 1 and the measurement circuit 2, and performs signal conditioning on them to filter out the sine waves that are not at the resonance frequency point of the measurement tube. Noise interference, and then perform signal shaping on the two-way sine waves after filtering out the interference; the two-way sine waves after filtering, shaping and other signal conditioning links enter the comparator and compare with fixed levels respectively, and convert the sine waves into two-way square waves Wave, these two square waves are subjected to XOR logic operation, and the pulse signal is obtained and entered into the counter 1 for counting, so that the measurement data ΔT of the mass flowmeter is obtained 0 ;
[0012] Due to the parameter drift of the circuit components with time and temperature, it will caus...
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The invention relates to a detection method of a Coriolis mass flowmeter, relates to a detection method of the Coriolis mass flowmeter, and aims at solving the problem of errors developed in the measurement data. The detection method comprises the following steps: a mass flow transmitter receives a periodical sine wave generated by two detection parts to condition and shape a signal; comparison is performed after filtering and shaping, and as the sine wave is converted into two paths of square waves, exclusive or logic operation is performed; and a counter 1 counts the obtained pulse signals to obtain measurement data deltaT0. The detection method is characterized in that an independent calibration circuit switches between the sine wave signals of the two detection parts, and a phase difference deltaT1 between a measurement circuit 1 and the calibration circuit is obtained from a counter 2; a phase difference deltaT2 between the measurement circuit 2 and the calibration circuit is obtained from a counter 3; the phase difference deltaT2 is subtracted from the phase difference deltaT1 to obtain the phase difference between the measurement circuit 1 and the measurement circuit 2, andthe phase difference between the measurement circuit 1 and the measurement circuit 2 is subtracted from the measurement data of the mass flowmeter to obtain accurate data.
Description
Technical field: [0001] The invention relates to a detection method for a Coriolis mass flow meter. Background technique [0002] The Coriolis mass flowmeter is a new type of intelligent instrument that uses the Coriolis force effect to measure the mass flow, density, temperature and other parameters of the fluid flowing through the pipeline. It usually consists of two parts, a mass flow sensor and a mass flow transmitter. [0003] A Coriolis mass flowmeter usually consists of two curved flow tubes. Under the action of the driving circuit and the drive components composed of magnets and coils installed on the measuring tube, the measuring tube vibrates periodically at its resonant frequency. The two detection parts composed of magnets and coils installed on both sides of the driving part generate periodic sine waves as detection signals. When there is no fluid flowing through the flow tube, the two detection components generate periodic sine waves with the same phase; when...
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IPC IPC(8): G01F1/84
Inventor 康剑
Owner SHANGHAI YINUO INSTR