Turbine flowmeter accuracy is about 0.5-0.1%. In the linear flow range, even if the flow changes, the cumulative flow accuracy will not be reduced. And in a short time, the reproducibility of the turbine flowmeter can reach 0.05%; the turbine flowmeter's range ratio can reach 8-10. In the same caliber, the maximum flow rate of the turbine flowmeter is larger than many other flowmeters; the turbine flowmeter can be made into a closed structure, and its rotational speed signal is non-contact measurement, so it is easy to achieve high-pressure design; if the flowmeter turbine and bearing selection resistance High temperature, low thermal expansion coefficient material can be used in a wide temperature range; turbine flowmeter output is a pulsed digital signal proportional to flow. It has the advantages of not reducing the accuracy during transmission, accumulating easily, and being easy to send into the computer system; in order to make full use of the characteristics of the turbine flowmeter, it must pay full attention to the installation and use of the flowmeter.
In order to ensure that the display instrument has sufficient sensitivity to the pulse signal output by the turbine sensor, the signal to noise ratio must be improved. To this end, various electrical interference phenomena, namely electromagnetic induction, electrostatic and capacitive coupling, should be prevented during installation.
1 The uneven distribution of flow velocity and the presence of secondary flow in the tube are important factors influencing the measurement accuracy of the turbine flowmeter. Therefore, turbine flowmeters have certain requirements for upstream and downstream straight pipe sections. For industrial measurements, generally require 20D upstream and 5D downstream straight pipe length. To eliminate the secondary flow, it is best to install a rectifier on the upstream side. If the upstream end can guarantee a straight pipe section of about 20D, and install a rectifier, the measurement accuracy of the flowmeter can reach the accuracy level of the calibration.
Turbine flowmeters have high requirements for the cleanliness of fluids. Filters must be installed before the flowmeter to ensure fluid cleanliness. Filter can be used funnel type, its own cleanliness, can be measured at both ends of the differential pressure change.
3 To ensure that the liquid passing through the flowmeter is single-phase, that is, air or steam cannot be allowed to enter the flowmeter, an air eliminator should be installed upstream of the flowmeter when necessary. For easy gasification liquids, a certain back pressure must be guaranteed downstream of the flowmeter. The back pressure can be twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the measured liquid vapor pressure at the highest temperature.
In order to ensure that the display instrument has sufficient sensitivity to the pulse signal output by the turbine sensor, the signal to noise ratio must be improved. To this end, various electrical interference phenomena, namely electromagnetic induction, electrostatic and capacitive coupling, should be prevented during installation.
1 The uneven distribution of flow velocity and the presence of secondary flow in the tube are important factors influencing the measurement accuracy of the turbine flowmeter. Therefore, turbine flowmeters have certain requirements for upstream and downstream straight pipe sections. For industrial measurements, generally require 20D upstream and 5D downstream straight pipe length. To eliminate the secondary flow, it is best to install a rectifier on the upstream side. If the upstream end can guarantee a straight pipe section of about 20D, and install a rectifier, the measurement accuracy of the flowmeter can reach the accuracy level of the calibration.
Turbine flowmeters have high requirements for the cleanliness of fluids. Filters must be installed before the flowmeter to ensure fluid cleanliness. Filter can be used funnel type, its own cleanliness, can be measured at both ends of the differential pressure change.
3 To ensure that the liquid passing through the flowmeter is single-phase, that is, air or steam cannot be allowed to enter the flowmeter, an air eliminator should be installed upstream of the flowmeter when necessary. For easy gasification liquids, a certain back pressure must be guaranteed downstream of the flowmeter. The back pressure can be twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the measured liquid vapor pressure at the highest temperature.
Masterbatches are mainly used on plastics. The color masterbatch is composed of three basic elements: pigments or dyes, carriers and additives. It is an aggregate obtained by uniformly loading a large amount of pigment into the Resin. It can be called Pigment Concentration. The tinting strength is higher than the pigment itself. Mixing a small amount of color masterbatch and uncolored resin during processing can achieve a colored resin or product with a designed pigment concentration.
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