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1. Positive displacement compression in multi-stage variable positive displacement compressors in the chemical process simulation software Aspen PLUS Positive displacement compressor, also known as positive displacement compressor, is a compressor that relies on the reduction of the internal volume of the compression chamber to increase gas or vapor pressure. 2. The meaning of positive division flow meter
Positive division flow meter in English [ˈ p ɒ z ə t ɪ v d ɪ s ˈ ple ɪ sm ə nt fl ə ʊˈ mi ɪ t ə (r)] in the United States [ˈ p ∝ z ə t ɪ v d ɪ s ˈ ple ɪ sm ə nt flo ʊˈ mi ɪ t ə r] volumetric flow meter
3. Advantages and disadvantages of Smith scraper flowmeter
Smith scraper flowmeter (Positive Displacement RotaryVane Meter) is composed of a scraper measuring chamber and a double-layer shell under pressure, which can maintain the factory processing accuracy in working condition and ensure that the product measurement accuracy does not change with environmental changes. The straight through shell and rotating scraper ensure a large drainage volume, and are widely used in inventory control and settlement of important trade occasions such as crude oil, finished oil, solvents, chemicals, paints, fertilizers, and food. Feature ■ Excellent accuracy - Following the Rotary Vane principle, with a specially designed instrument measuring chamber, the pressure difference between the inlet and outlet is minimized across the measuring chamber, and the medium flow is optimized through the instrument, ensuring instrument accuracy. Extremely low pushing pressure - The latest flow path design provides extremely low pushing pressure. ■ Extremely high instrument repeatability - instrument repeatability reach
4. Practical principles and operating steps of pipettes
Practical principles and operating steps of pipettes The working principle of pipettes is mainly divided into two categories according to their working principles: gas piston pipettes and external piston pipettes.
. Air push: The working principle is to push the piston through the expansion and contraction of the spring, remove some air, use atmospheric pressure to suck in liquid, and then push the air to discharge the liquid by the piston. There is an air column between the liquid and the piston, which is suitable for conventional aqueous solutions. External piston type pipette (Positive separation): The working principle is to extract and dispense liquid through the continuous movement of the piston inside the pipette or suction head. The piston comes into direct contact with the liquid without an air column. This design is not only suitable for conventional aqueous solutions, but also particularly suitable for problematic liquids such as high viscosity, volatility, and foaming. The operation steps of a pipette include selecting the appropriate pipette tip: The pipette tip and pipette tip are equally important, and only high-quality pipette tips can fully reflect the accuracy of the pipette. It is recommended to use the manufacturers original suction head to ensure smooth and flawless tip and uniform height, thereby ensuring the reproducibility of experimental results. Choose a pipette that is suitable for
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