I have a few questions about instruments.
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1. What are the common types of flow rate measuring instruments used in industry? What are the approximate purchase prices for orifice plates, rotors, and those that are commonly used? 2. Is the measurement of mass flow rate usually done directly or indirectly? 3. Are the measuring elements commonly used to determine the liquid level in the control room of differential pressure type or electromagnetic type? Or something else? Approximate price range. Looking forward to answers from experts.
This question is simple as long as you have been to the site: 1. The orifice plate is the cheapest and most common flow measurement instrument, with a price of around a few hundred yuan! The rotor is suitable for applications with small pipelines; prices vary depending on the manufacturer, and they are around a thousand yuan ； 2. The measurement of mass flow rate is usually done through direct measurement ； 3. Electromagnetic methods cannot be used to measure liquid levels; you had better study the basic knowledge books carefully!
Could the moderator on the first floor recommend some books? Preferably those in electronic format. I’m not majoring in this field, so I really don’t know much about it.
1. There are many ways to measure flow rate, and the choice depends on various factors such as the properties of the fluid medium and the pipe size; orifice plate measurement is relatively inexpensive. 2. Mass flow measurement is usually done using direct methods; flowmeters based on the Coriolis principle are commonly used, but they are relatively expensive. 3. There are also many methods for level measurement, which are related to the properties of the liquid medium and the shape of the container; differential pressure measurement is relatively inexpensive.
I have a few e-books on automatic control instruments
Email: bergkamp888@163.com Thanks
What is the Coriolis force principle? Could you explain it in detail? Also, may I ask what the local resistance coefficients of the rotameter are at 1/4 open, 1/2 open, 3/4 open, and fully open? This post was last edited by bergkamp888 on 2009-3-3 20:45.]