Mass flowmeter
A direct mass flow meter is made by using the Coriolis force principle, which is proportional to the mass flow when the fluid flows in a vibrating tube. The volume flow can be calculated by setting a fixed density in the parameter. The existing mass flow meter has a communication module, which is displayed through the bus access system, which can reduce the error in 4-20mA current transmission.
High-precision mass flowmeters are generally used in applications with high fluid value, such as automotive gasoline and diesel.
Differential pressure flowmeter
A meter that calculates flow based on known fluid conditions and the geometry of the detected pipe based on the differential pressure generated by the flow detector installed in the pipe.
Differential pressure flowmeter is widely used, can cope with a variety of high pressure, high temperature and other harsh fluid environment.
Positive displacement flowmeter
It uses a mechanical measuring element to continuously divide the fluid into a single known volume portion, and measures the total volume of the fluid according to the number of times the measuring chamber repeatedly fills and discharges the volume portion of the fluid.
Suitable for single-phase clean fluid, complex mechanical structure, easy to be blocked by foreign matter or wear, resulting in measurement errors, commercially suitable for use in volumetric settlement occasions. In addition, direct-reading meters do not require energy for accumulation.
Electromagnetic flowmeter
According to Faraday's law of electromagnetic induction, it is a kind of instrument for measuring conductive liquids.
The measuring channel is a smooth straight tube, non-blocking, suitable for measuring liquid-solid two-phase fluids containing solid particles, such as pulp, mud, sewage, etc. The measured volume flow rate is not significantly affected by changes in fluid density, viscosity, temperature, pressure and conductivity. Large flow range, can be applied to corrosive fluids.
The disadvantage is that it is not possible to measure liquids with very low electrical conductivity, such as petroleum products, and inaccurate measurement will also occur in soft water with low electrical conductivity. Gases, vapors and liquids containing large bubbles cannot be measured.