Bitoba flowmeter

Bitoba flow meters are mainly used for measuring various energy sources such as liquids, fuel gases, vapors, and gases in industrial processes, with high stability and repeatability.

Bitoba flowmeterIt is an energy-saving flowmeter mainly used for measuring various energy sources such as liquids, fuel gases, vapors, and gases in industrial processes, with high stability and repeatability. The design theory conforms to the Bernoulli equation principle and can be verified using the JJG/640-90 standard. It can measure the flow rate of fluids such as liquids, gases, and vapors. Due to the absence of moving parts, there is almost no pressure loss, making installation and maintenance convenient

Working principle of Pitot tube flowmeter

The pitot tube flowmeter is a differential pressure flowmeter that uses the pitot tube principle to extract fluid flow velocity (total pressure static pressure=dynamic pressure) and convert it into fluid volume flow rate and mass flow rate. The pitot tube principle has been widely used in the aerospace industry for a long time. For example, testing and inspection of aircraft wind tunnels, aerodynamic testing of aircraft engines, speed measuring rods for aircraft flight speed, etc. The anti blocking Bituoba measurement system consists of an anti blocking primary measurement sensor - Bituoba sensor (which does not require cleaning and has anti blocking and wear-resistant properties), a protective device, and a high-precision differential pressure transmitter; Using the Bitoba sensor as a flow measurement sensor in conjunction with a high-precision differential pressure transmitter to measure differential pressure, and converting the differential pressure signal into a 4-20mA DC standard current signal, then introducing it into the DCS system (our factory provides a calculation model and parameter table), and displaying differential pressure, instantaneous flow rate, cumulative flow rate, speed and other parameters digitally.

Calculation formulas related to Pitot tube flowmeter

流速V中心= Ai·√2 △ P/ρ (i∈N )

P: Standard differential pressure after wind tunnel calibration correction

Q body=K (V center x S)

Q mass=Q body × ρ

K: Pipeline correction factor

High accuracy: The accuracy is 0.2% within the range of 3% to 100%, determined by the following factors:

1Bitoba flowmeterThe measuring point is located in the central area of the pipeline, and each probe can be calibrated on a standard wind tunnel from a wind speed of 0 meters per second to a wind speed of 150 meters per second. The calibrated data is then subjected to complex calculations to obtain the correction coefficient of the probe, so that the center flow velocity extracted by the corrected probe corresponds to the average flow velocity of each point in the pipeline (note: the relationship between the average flow velocity of each point in the pipeline and the center flow velocity extracted by the probe is based on decades of experience in the wind blowing database of Tsinghua University).

2. In fluid mechanics, the relationship between flow velocity (converted from differential pressure to flow velocity) and flow rate is not a simple linear correspondence. Therefore, our factory uses a segmented correction method to correct the measured signal when calculating flow rate. When calculating, our factory divides the 4-20mA standard DC current signal output by the differential pressure transmitter into n segments and performs calculus calculations to obtain n correction coefficients, thereby ensuringBitoba flowmeterEnsure accuracy within the full range.

3. Professor Xu Xiangdong, director of the State Key Laboratory of Thermal System Control, Department of Thermal Energy Engineering, Tsinghua University, combined with decades of scientific research experience in pneumatic probes (aircraft speed measuring rods), has carried out a lot ofBitoba flowmeterThrough experimentation and practice, a large amount of data has been accumulated and aggregated into a database, which includes compensation under various media, pressures, and temperatures, as well as experimental correction values for insufficient straight pipe sections in pipelines. This database can select the corresponding pipeline model for any working condition of the user, and calculate the accurate flow rate after precise correction.