Gas mass flow meter measurement

Mass flowmeters can be divided into two types: direct type and indirect type: the working principle of the direct type is often related to the mass (density) of the medium, that is, the direct measurement andρν proportional signal. At present, the most widely used direct mass flowmeters are: the mass flowmeter using the Coriolis principle and the thermal flowmeter using the principle of heat energy exchange between fluid and solid. The former can only be used for liquid medium measurement, and the latter is mostly used for gas medium measurement. The indirect method is to measure the medium density while measuring the flow velocity, or measure the temperature and pressure of the medium and obtain the medium density through calculation, and derive the mass flow rate from the density, flow velocity and flow area. In the measurement process, the density of the medium can be deduced from the temperature and pressure, and then the mass flow can be obtained, but its density is derived based on artificial settings, so the flowmeter that measures the mass flow in this way is not a mass flowmeter . A mass flow meter generally refers to a flow meter that can directly measure mass flow readings. Refers specifically to flowmeters utilizing the Coriolis principle. mass flow = density×flow rate×flow area, when the density in the formulaρWhen the flowmeter is detected by itself, this kind of flowmeter can be called a mass flowmeter. The measuring principle of the mass flow meter is similar to using a small measuring cup to obtain the capacity of the liquid in a large container through multiple measurements. It enters a space with a fixed size during the flow process, and pushes the space to move to a certain position along the direction of fluid movement and then flows out. When this process is carried out continuously, the traffic can be obtained by counting the number of spaces passed. The mass flow meters that work according to this principle include: oval gear mass flow meters, waist wheel mass flow meters, mass flow meters, rotary piston mass flow meters, and disc mass flow meters. Wet mass flowmeter, bladder mass flowmeter Mass flowmeter using the conversion principle of dynamic pressure energy and static pressure energy: In the same closed pipeline, when the fluid flow speed is accelerated, its static pressure energy will be converted into dynamic pressure energy. Therefore, in the same closed pipe, the static pressure is lower at the faster flow rate. A throttling element is set in the fluid passage to speed up the fluid flow through the throttling element, then a static pressure zone with different pressures will be formed before and after the throttling element, and the square of the pressure difference is proportional to the flow rate. By measuring the differential pressure and adding The square root can get the flow value. The mass flowmeters that work according to this principle are: orifice mass flowmeter, nozzle mass flowmeter, 1/4 round nozzle mass flowmeter, Venturi tube mass flowmeter, V plug tube mass flowmeter , laminar flow mass flowmeter, weir mass flowmeter mass flowmeter using the principle of fluid dynamic pressure: The energy of fluid in motion to maintain its flow is called dynamic pressure energy. The dynamic pressure energy of the fluid is related to the flow rate. When changing the motion state of the fluid, the dynamic pressure energy of the fluid will be converted into dynamic pressure and act on the object that changes the motion state of the fluid. Detect the force on the object or directly measure the dynamic pressure The flow rate can be obtained, and then the flow value can be obtained.

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The first machine to produce digital fork density meter, the vortex flow meter manufacturer mass flow meter was invented in insertion ultrasonic flow meter in endress hauser coriolis mass flow meter by endress hauser ultrasonic flow meter and was subsequently improved.