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1. Instrument calibration of differential pressure flowmeter
The calibration of a pair of differential pressure flowmeters includes: ⑴ geometric inspection method and ⑵ coefficient calibration. For the geometric inspection method, please refer to the introduction of the calibration regulations, which will not be repeated here. The following is a brief introduction to the relevant calculation formulas and methods involved in the coefficient verification method. The second calculation formula is v=aA √ 2/j (p-q) v - volume j - liquid density a - flow coefficient, which is related to the pressure measurement method and flow rate of the channel size. A - orifice plate opening area p-q - pressure difference orifice plate calculation outflow coefficient C formula (compiled by the author) Reynolds number can be calculated according to the relevant formula, such as the commonly used calculation formula for Reynolds number eDR. 9. The basic error limits of the sensor should comply with the provisions of Table 8. Measurement accuracy: ± 0.2% ± 0.5% ± 1.0% Repetitive accuracy: ± 0.2% Sensor error requirements. The above calibration information is provided for reference by users with calibration devices. If there is any calibration related to JJG640-1994, please refer to it. In case of any violation of regulations, the regulations shall prevail. There are many types of differential pressure flow meters, and currently the commonly used differential pressure flow meters in the market include Bitoba flow meter, orifice plate flow meter, V-cone flow meter, Annubar flow meter, Widiba flow meter, Diamond bar flow meter, Delta bar flow meter, porous Pingqin travel balance flow meter, etc.
2. A calculation question about 
The flow rate is proportional to the square root of the pressure of the differential pressure stove, rather than simply proportional!
! Essence: Q/Qmax=√ Δ P/√ Δ Pmax=√ I/√ Imax (note the root) From the above equation, Δ P/Δ Pmax=I/Imax, where Q is the flow attendant quantity Qmax is the maximum range value, where 200T/H Δ P is the differential pressure Δ Pmax is the maximum differential pressure range of 25Kpa and Imax is 16mA. After calculating I, 4mA must be added to calculate 80T/H. When the differential pressure is 4Kpa and the current is 6.56mA and 100T/H, the differential pressure is 6.25Kpa and the current is 8mA.3. What are the top ten brands of ultrasonic flow meters?
What are the top ten brands of ultrasonic flow meters you asked about? Let me help you sort them out. At present, mainstream brands are mainly divided into two categories: international giants and domestic leading enterprises, each with their own focus, and there is no absolute first place. The key depends on your specific application scenarios. 1. Emerson: an American brand with the authoritative Rosemount differential pressure/vortex product line in the energy industry, leading the global high-end market for high-precision Coriolis flow meters, The SITRANS series is suitable for the construction of digital factories, with a market share of over 40% in the fields of power and metallurgy. YOKOGAWA is a Japanese brand with industry-leading quality and stability, and its multivariable transmitter technology is unique in the field of energy management. ABB is a Swiss/Swedish brand that focuses on electromagnetic and ultrasonic dual technology routes, and OPTISONIC ultrason