The working principle and application of the portable ultrasonic flowmeter

1. Summary with the progress of science and technology, a portable ultrasonic flowmeter arises at the historic moment, has been widely used in the production field of flow measurement and on-line calibration. FLB portable flowmeter has the following characteristics ( 1) Small volume, light weight, easy to carry; ( 2) Instrument is not direct contact with fluid, do not affect pipeline system running, convenient installation; ( 3) Data input through the man-machine dialogue mode, the operation is convenient. ( 4) Wide range of measuring diameter: ( A small probe application & Phi; 25 ~Φ 350 mm in diameter, is applied to the tip & Phi; 200 ~Φ 6000 m diameter) 。 Ac and dc power supply, strong commonality. ( 5) By digital liquid crystal display and printer can easily read and record the measurement data and data. ( 6) The result data can be displayed and printed, also can deposit in the internal register. Portable flow meter consists of two parts, host and probe, the host can display parameters, measurement results, etc. , probe is installed on the pipeline is used to transmit and receive ultrasonic signals. 2. Working principle of ultrasonic in fluid, its velocity or phase to the influence of the fluid velocity, will through the fluid of ultrasonic signal processing appropriately, can detect the fluid velocity, thus draws the fluid flow. Method of time difference ultrasonic flowmeter is the use of ultrasonic shun, reverse flow velocity in the fluid caused by the different time difference measured fluid velocity and calculate the flow. 3. Application of portable flowmeter is mainly used in two aspects: on the one hand, to not put table measuring line for the flow measurement; Loading forms, on the other hand, for the measurement of pipe flow check online. 3. 1 the flow measurement correctly installed probe in the line and makes probe cables that goes with the host. After electrify, input pipe parameters ( Including pipe diameter, pipe material, wall thickness, fluid type, installation method, etc. ) Properly installed probe, according to the installation distance, normal measuring portable flow meter into the state. We can see all kinds of flow display, including the instantaneous flow rate value, the instantaneous flow rate value, positive cumulative flow and negative cumulative flow receive strength A12. In the measurement condition, we can be print the measurement data. Also can transmit data external devices. 3. 2 online flowmeter calibration due to the continuous operation of the production system, some flowmeter calibration cannot be the same period, the portable flowmeter for flow meter calibration online, completed the verification work on a regular basis and ensure the continuous and accurate measurement. T at the same time, record the accumulation of on-line flowmeter flow value Q1, Q2 records the accumulation of portable flowmeter flow value at the same time, the east after the time, the if online flowmeter measurement data error according to the formula: a new revised = ( Q2 (Q1) × Online meter of the original revised to on-line flowmeter for correction. 4. Sensor installation considerations for sensor installation position, the flow condition of the pipeline under test influence on measurement accuracy is quite big, should choose the location of the satisfy the following conditions: ( 1) Length of straight pipe upstream side more than 10 d, downstream straight pipe length measurement more than 5 d. ( 2) Flow upstream side within 30 d, there is no interference factors. ( 3) Must be full of fluid pipeline, there should be no air bubbles. ( 4) When diameter is 200 mm or more, should choose the Z method, when unable to provide the installation of the appropriate spacing or fluid also should choose the Z method when high concentrations. 5. Conclusion the application of the portable ultrasonic flowmeter is very extensive, almost finished all the new meter measurement and calibration work online, in the metrology management play an role instead.

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