At present, the mainstream good price and quality steam vortex flow meter in the market (unit: cubic meter per second) mainly has the following two common signal measurement methods:
1、 Measurement method of PLL circuit: two groups of transmitters / receivers are installed on the wall of the measuring tube respectively, one group is used for downstream measurement, the other group is used for countercurrent measurement, and the other two groups of PLL circuits measure the phase difference in the downstream / countercurrent direction respectively. Good price and quality steam vortex flow meter is a special instrument for measuring the cumulative mass flow of steam, which has two structural forms: mechanical and intelligent; Through the on-site display of the indicator dial (Mechanical) or liquid crystal display (intelligent), the quality of all steam flowing through the meter can be accurately read, and the pulse signal can be output. It has the function of manual pressure compensation or automatic temperature compensation.
The circuit principle of good price and quality steam vortex flow meter is as follows: the first group of piezoelectric jump oscillators sends out oscillation waves, which are divided by frequency divider. One frequency division is sent to the transmitter through synchronous converter, reaches the receiver through measured fluid, and then sent to the receiving circuit through synchronous converter. After amplification and shaping, it enters the input end of phase difference circuit; The other frequency division is directly sent to other inputs of the phase difference circuit. The good price and quality steam vortex flow meter adopts advanced differential technology, combined with isolation, shielding, filtering and other measures to overcome the problems of poor seismic performance and small signal data disorder of similar products. It adopts unique sensor packaging technology and protection measures to ensure the reliability of products. When the first frequency division propagates in the fluid, its wave velocity is superimposed by the flow velocity. When the two groups of frequency division reach the phase difference circuit, it will produce phase offset. After the offset is locked, it is fed back to the piezoelectric jump oscillator through the integral amplifier and superimposed with the original oscillation frequency to form an envelope wave. The working principle of the second group of piezoelectric jump oscillators is the same as that of the first group. The difference is that when the measured fluid passes through, their flow directions are different, so the direction of phase offset is also different. When the two phase locked envelope waves are superimposed into the modulator again, an electrical signal proportional to the flow rate is finally generated.
2、 Measurement method of time locking circuit: like the phase-locked loop circuit, two groups of transmitters / receivers are installed on the wall of the measuring tube, one for downstream measurement and the other for countercurrent measurement.
The circuit principle of the good price and quality steam vortex flow meter is as follows: the first group of piezoelectric jump oscillators sends out oscillation waves and is divided into two channels after entering the synchronous starter. One channel enters one input end of the TDOA measurement circuit through the transmitter, receiver and automatic gain circuit, the other channel enters the other input end of the TDOA measurement circuit through the counter, the delay circuit enters the other input end of the TDOA measurement circuit, and the locked TDOA signal is taken out through signal sorting, The piezoelectric jump oscillator is superimposed with the original oscillation frequency to form an envelope wave. Steam vortex flowmeter is a special instrument for measuring the cumulative mass flow of steam, which has two structural forms: mechanical and intelligent; Through the on-site display of the indicator dial (Mechanical) or liquid crystal display (intelligent), the quality of all steam flowing through the meter can be accurately read, and the pulse signal can be output. It has the function of manual pressure compensation or automatic temperature compensation. The working principle of the second group of piezoelectric jump oscillators is the same as that of the first group, and the final result is the same as that of the phase-locked loop circuit.


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