The working principle of the DN80 liquid turbine flowmeter The turbine flowmeter is composed of a turbine, bearings, a preamplifier and a display instrument. The fluid to be measured impacts the turbine blades, causing the turbine to rotate. The rotational speed of the turbine varies with the flow rate; that is, when the flow rate is large, the rotational speed of the turbine is also high. Then, the rotational speed of the turbine is converted into electrical pulses of the corresponding frequency by the magnetic-electric conversion device. After being amplified by the preamplifier, it is sent to the display instrument for counting and display. The instantaneous flow rate and cumulative flow rate can be calculated based on the number of pulses per unit time and the cumulative number of pulses. The working principle of the sensor is that when the fluid flows along the axis of the pipe and impacts the turbine blades, a force proportional to the product of the flow rate qv, flow velocity V and fluid density ρ acts on the blades, driving the turbine to rotate. While the turbine rotates, the blades periodically cut the magnetic field lines generated by the electromagnet, altering the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is directly proportional to the flow rate of the fluid being measured. Among them, qv represents the total volume of the fluid, and N is the total number of pulsations generated by the flow sensor. ξ is the flow coefficient.

The important characteristic parameters of sensors vary among different instruments and change with the wear and tear of the instruments over long-term use. Its meaning is the number of pulses output by the flow sensor when a unit volume of flow passes through it. The pulse signal output by the sensor, after being amplified by the preamplifier, is sent to the display instrument, thus enabling the measurement of flow.

Product features of DN80 Liquid Turbine Flowmeter 1. Small pressure loss, and the impeller has anti-corrosion function; 2. It adopts advanced ultra-low power consumption single-chip microcomputer technology, featuring strong overall functionality, low power consumption and superior performance. 3. Intelligent flow display with nonlinear precision compensation function. The accuracy of the corrected formula is better than ±0.02%. 4. The instrument coefficient can be set online by pressing keys and displayed on the LCD screen. The LCD screen is intuitive, clear and highly reliable. 5. EEPROM is adopted to provide power-off protection for cumulative flow and instrument coefficient, with a protection time of more than 10 years. 6. It adopts a high-performance MCU central processing unit to complete data acquisition, processing, display and output, as well as the simultaneous display of cumulative flow and instantaneous flow on the same screen, facilitating the realization of a convenient human-machine interface. Data transmission is carried out in standard 485 form. 7. It adopts a fully hard alloy (tungsten carbide) shielded cantilever beam structure bearing, integrating the rotating bearing and the pressure bearing into one, which greatly enhances the bearing life and enables it to operate in media with a small amount of sand and dirt. 8. It adopts a full stainless steel structure of 1Cr18Ni9Ti (the turbine uses 2Cr13), which has excellent anti-corrosion performance. 9. Easy to maintain, with a self-rectifying structure, small and lightweight, simple in structure, it can be assembled and disassembled in a short time, and the internal cleaning is simple. 10. It has strong anti-magnetic interference and vibration capabilities, reliable performance and a long service life. 11. Low lower limit flow velocity and wide measurement range; 12. The on-site display type LCD screen shows clearly and intuitively, has low power consumption, and can operate continuously for more than 5 years with a 3V lithium battery power supply. 13. Corrosion-resistant, suitable for acid and alkali solutions;

Performance characteristics of remote transmission electromagnetic flowmeter It is a flow meter with high precision, high reliability and long service life. Therefore, in the process of designing the product structure, selecting materials, formulating processes, production assembly and factory testing, we are very meticulous and careful in every link. We have also independently designed a set of advanced domestic production equipment and flow actual flow calibration devices specifically for electromagnetic flow meters. The remote transmission electromagnetic flowmeter can thus ensure the long-term high quality of the product both in software and hardware. The remote transmission electromagnetic flowmeter is specially designed with a wide-temperature Chinese LCD display with backlight. It is fully functional, practical, intuitive in display and convenient to operate and use, which can reduce the inconvenience caused by the English menu of other electromagnetic flowmeters. In addition, we have designed a multi-electrode structure, which further ensures measurement accuracy and eliminates the need for grounding rings at any time, reducing the volume of the instrument and the trouble of installation and maintenance.

How to correctly select a remote transmission electromagnetic flowmeter The actual maximum working pressure must be less than the rated working pressure of the flowmeter. The high working temperature and low temperature must comply with the temperature requirements specified by the flowmeter. Determine whether there is negative pressure. You can select the corresponding electromagnetic flowmeter based on the flow rate in the above table. If the inner diameter of the selected electromagnetic flowmeter does not match that of the current process pipeline, pipe reduction or expansion should be carried out. If the pipeline of the remote electromagnetic flowmeter undergoes pipe contraction, it should be considered whether the pressure loss caused by the pipe contraction will affect the process flow. Considering the product price, an electromagnetic flowmeter with a smaller diameter can be selected, which relatively reduces investment. When measuring clean water, the economic flow rate should be 1.5-3m/s. When measuring solutions that are prone to crystallization, the flow rate should be appropriately increased, preferably 3-4m/s, to achieve self-cleaning and prevent adhesion and deposition, etc. When the remote transmission electromagnetic flowmeter consumes fluid, the flow rate should be appropriately reduced, with 1.0-2m/s being ideal, to minimize wear on the inner lining and electrode ground. In practical applications, it rarely exceeds 7m/s, and exceeding 10m/s is even rarer.