Lightning protection study of vortex flow sensors

Beijing Fox Technology, professional gas mass flow controller, Beijing Fox Technology specializes in the production of thermal mass flow meters, thermal distributed mass flow meters and regulators and other products, the company adheres to scientific and technological support and world-class professionals, with advanced equipment, strict management, first-class service, to create a world-class brand.

It adopts a new design of mechanical vibration, impact and dirt resistance. Using the most advanced integrated circuit, the signal processing accuracy is high, the anti-interference is high, and the reliability is high. Extended-range models are available for superior small flow performance and extended flow range.

Capacitive flowmeter is optional, with good seismic performance and a maximum measurement temperature of 400. A submersible flow meter is available to allow for long-term immersion in water.

According to the Karman vortex street theory, the vortex flow meter is a kind of velocity flow meter made by using the natural vibration principle of the fluid and using the piezoelectric crystal or differential capacitor as the detection component.

Figres vortex flow sensors have many significant advantages, such as no moving parts, large measurement range, wide medium adaptability, high measurement accuracy, long verification cycle, long transmission signal distance, small pressure loss, simple structure, reliable operation, long service life, and convenient installation and maintenance. It can be widely used in petrochemical, metallurgical machinery, food, papermaking, as well as urban pipeline heating, water supply, gas and other industries of various liquids, gases, vapors and other single-phase fluids process measurement and energy-saving management.

1) Experimental pipeline, the device consists of 8 standard sensors with a diameter of DN = 50 150mm, and the parallel combination is compared with the detected large-diameter sensor (DN = 80 300mm). The test pipeline is arranged in parallel in the diagonal direction, the purpose of which is to save raw materials, reduce the cost, and just meet the requirements of the front straight section of various caliber sensors (according to the national standard ZBN12005-1989 or the procedure JJG643-1994) The standard sensor front straight pipe section is longer than 50DN; The straight pipe section in front of the detected sensor is longer than 20dn; Minimize drag loss.

2) The air source is supplied by two 9-19 high-pressure centrifugal fans and one LG300 200-1 roots blower. Two centrifuges of the same model can be operated in series or parallel according to the needs of the flow rate by controlling the electric valve to meet the requirements of different flow rates and different pressures.

3) Standard sensor: The device selects 8 standard sensors, all of which are stress vortex street sensors, the advantage of the instrument is that there are no moving parts, it has high repeatability, and has strong resistance to overload and impact. The stainless steel used for the sensor body is resistant to wear and corrosion, and the sensor is highly stable.

In addition, the instrument coefficient of this type of sensor is not or rarely affected by the physical parameters of the measured medium, so when used as a standard sensor, as long as it is basically the same as the measured material.

At present, the standard degree of gas vortex street sensor in China is generally at the level of grade 1, from the level of accuracy, it can not be used as a standard sensor, but the range of this kind of instrument is very wide, generally around 10:1 15:1, and the repeatability is very good, all are within, or even higher, such as the use of compression range in fixed-point calibration is an effective method to improve accuracy.

We have done a lot of experimental research work, and the results show that if the range is compressed to within 2:1 or 3:1, the requirements can be met in the fixed-point calibration, so it is feasible to use this sensor standard to establish a gas flow device.