Is it necessary to set the density of the mass flow meter | e+h

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1. What are the types of mass flow meters?

2. Technical specifications of mass flow meters.

Mass flow accuracy: ± 0.002 × flow rate ± zero drift density measurement accuracy: ± 0.003g/cm3 Density measurement range: 0.5~1.5g/cm3 Temperature measurement accuracy: ± 1 ° C Environmental temperature: -40~60 ° C Medium temperature: -50~200 ° C Explosion proof type: iB Ⅱ BT3 Associated equipment: Supporting transmitter Operating temperature: 0~60 ° C Relative humidity: below 95% Power supply: 220 ± 10% VAC, 50Hz or 24 ± 5% VDC, 40W Figure 1 shows a calorimetric mass flow meter. When the fluid is stationary, the thermocouple symmetrically placed at both ends of the heat source indicates equal temperature. The commonly used bypass tube mass flowmeter divides the pipeline into countless small pipelines with thin tubes, and then leads out one pipeline in the middle, placing the sensor outside the bypass tube. This method separates the measuring element from the medium, but the response speed and accuracy are slightly lower. With the advancement of processing technology, the accuracy and repeatability of the flowmeter have made significant progress. Figure 2 shows a dual orifice differential pressure mass flowmeter. Install two identical orifice plates at locations A and B. There are two identical constant flow pumps installed in the diversion pipeline that can generate constant volume flow q in opposite directions. The pressure difference △ P=P1-P3=4K ρ Qq before and after the two orifice plates is proportional to ρ and Q. In the equation, K is a constant coefficient, ρ is the density, Q is the volumetric flow rate of the pipeline, and ρ Q is the mass flow rate. Figure 3 shows a dual blade mass flowmeter. Install

two impellers with unequal blade angles coaxially inside the shell, and connect them together with springs in the middle. The difference in torque between the two wheels causes the spring torsion angle α to vary with the mass flow rate M and angular frequency; The product is proportional, i.e. α ∝ M&owega;. The time required to measure the angular displacement α can be used to determine the value of M. The measurement method is to install two electromagnetic detectors on the shell, and start counting when the first turbine generates a pulse. When the second turbine generates precession pulse, stop counting. Measure the time t based on the standard frequency of the counter, and then calculate the value of M. There are three main types of indirect mass flow meters: a combination of velocity flow meters and density meters, a combination of throttling (or target) flow meters and volumetric flow meters, and a combination of throttling (or target) flow meters and density meters. A mass flow measurement instrument with a microcomputer, also known as a mass flow computer, is a universal new type of flow measurement instrument. It can input signals such as fluid density, flow rate (turbine flowmeter, throttling flowmeter), specific gravity, temperature, pressure, heat, etc.

3. What is a mass flow meter?

Mass flow rate, as an important parameter in measurement, specifically refers to the throughput of a fluid measured by mass rather than volume.

. It can be defined using the formula qm=m/t=ρ× u × A, where qm represents mass flow rate in kg/s; M is the mass of the fluid per unit time, measured in kg; ρ is the density of the fluid, measured in kg/m ³; T is time, measured in seconds; u is the average flow velocity

Is it necessary to set the density of the mass flow meter | e+h

1. What are the types of mass flow meters?

2. Technical specifications of mass flow meters.

3. What is a mass flow meter?

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