Abstract: The information on the nine precautions for overhauling instruments and meters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Nine precautions for overhauling instruments: 1. When using the ohm block of the multimeter, remember not to measure with electricity. 2. When using logic pen and oscilloscope to detect signals, be careful not to make the probe touch two measurement pins at the same time, because the essence of this situation is. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the nine precautions for instrument maintenance. Nine precautions for overhauling instruments: 1. When using the ohm block of the multimeter, remember not to measure with electricity. 2. When using a logic pen or oscilloscope to detect signals, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is to form a short circuit when the power is turned on. 3. When detecting the filter capacitor in the power supply, the positive and negative electrodes of the electrolytic capacitor should be short-circuited first, and the test lead wire should not be used instead of the wire to discharge the capacitor when short-circuiting, because it is easy to burn the core wire. You can take a 220V, 60-100W lamp with a lamp head lead and connect it to both ends of the capacitor, the bulb will flash at the moment of discharge. 4. When repairing the fault of the instrument in a humid environment, it is necessary to use a multimeter to test whether the points of the printed circuit are unobstructed, because the main fault in this case is copper foil corrosion. 5. When overhauling the internal circuit of the instrument, if insulating varnish is applied to the contacts of the installation components and the circuit board, when measuring the parameters of each point, an ordinary hand-stitched needle can be welded to the test pen of the multimeter, so as to pierce the paint layer and directly measure each point. Do not strip paint over large areas. 6. Do not plug and unplug various control boards and plugs with electricity. Because in the case of power-on, plugging and unplugging the control board will generate a strong induced electromotive force. At this time, the instantaneous counterattack voltage is very high, and it is easy to damage the corresponding control board and plug. 7. Don't blindly knock and touch during maintenance, so as not to expand the fault, and the more you repair, the worse it will be. 8. When disassembling and adjusting the instrument, the original position should be recorded for recovery. 9. When repairing precision instruments, if you accidentally bounce small parts, you should first determine the place where they may fly, do not look east, turn west, you can use magnet scanning and line-of-sight scanning methods to find. In short, in the maintenance of instruments and meters, flowmeters should first understand the basic principles of instruments and meters, and master the knowledge and skills related to electronics, and should prepare all technical information such as manuals and drawings of instruments and meters. A good work quality, thereby improving efficiency and reducing errors in instrument maintenance work. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Nine Precautions for Overhauling Instruments'
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Abstract: The information on why the value of the differential pressure flow meter is unstable is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. When the differential pressure flowmeter (differential pressure orifice flowmeter) is applied in the field, it often encounters such and other problems, but to investigate the reason, as long as it is installed correctly, the main problems are in the secondary Gauge differential pressure transmitter above, below. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on why the value of the differential pressure flowmeter is unstable. When the differential pressure flowmeter (differential pressure orifice flowmeter) is applied in the field, it often encounters such and other problems, but to investigate the reason, as long as it is installed correctly, the main problems are in the secondary On the differential pressure transmitter of the instrument, the following mainly introduces the main inspection places when these problems occur. 1. The output of the differential pressure transmitter is too low: the main reason is that the positive pressure pipe is leaking or blocked, the range of the differential pressure transmitter is too large, and the flow in the pipeline is too small. For general measurement fluids, it is impossible for the pressure guiding pipe to leak or block. The normal occurrence of this phenomenon is the on-site measurement of gas or media containing impurities. As long as we check the pressure guiding pipe, remove the blockage, and adjust the differential pressure transmitter Span and regulate process flow. 2. The output differential pressure is too high: This main reason is just the opposite of the above, you can refer to the above solutions to eliminate them one by one. 3. The output differential pressure is unstable and fluctuates greatly: the installation direction is incorrect, the disturbance of the upstream and downstream valves and the influence of the elbow on other choke parts have the greatest impact on the throttling element, which requires us to adjust the process or change the installation. Place. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'What is the reason for the unstable value of the differential pressure flow meter'
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Modeling is a comprehensive reflection of the level of application skills of the appearance and the quality of the appearance itself. The matching, coordination, and optimization of the measurement method and appearance to the measurement object and the application environment, as well as the previous design, selection, installation and debugging are all important factors affecting the development of the model. Ensure measurement accuracy Flow measurement accuracy refers to the accuracy achieved by the flow measurement system, which is different from the accuracy of the flowmeter itself. It's just that the flowmeter itself has good performance and high precision, which may not necessarily achieve high measurement accuracy. To ensure the accuracy of the flow measurement system, in addition to reasonable selection, correct installation and commissioning, and timely maintenance and maintenance, it is also a useful method to use intelligent technology to compensate and correct the errors that may be introduced in the measurement. Method. For example, to compensate the temperature expansion coefficient of the liquid, to compensate the temperature, pressure and compression coefficient of the gas, to compensate the Reynolds number influence of the differential pressure flowmeter and the stream expansion coefficient, to compensate the non-linearity of the flow coefficient of various flowmeters Compensate, compensate for the temperature influence of volumetric flowmeters and vortex flowmeters, and compensate for the velocity distribution of ultrasonic flowmeters, etc.: this kind of compensation and proofreading is to use a systematic method to integrate the inherent characteristics of the detection part and rely on other components. Mistakes that cannot be overcome by themselves penetrate Tsujiri, so that they can be eliminated or completely eliminated. Practice has shown that this method is simple, effective and promising. This approach will be described in detail in Chapter 8 of this book.
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A gas flow meter is a measuring instrument used for gas flow, which is mostly installed in pipelines to measure various chemical gases such as gas, natural gas, hydrogen, nitrogen, benzene, sulfur dioxide, methane, and hydrogen peroxide. A common gas flowmeter is a thermal gas flowmeter. This instrument can not only measure the gas flow, but also be used for process control together with other equipment, and it has a simple structure, high accuracy, and resistance Strong abrasiveness and other characteristics, so it has been widely used. The principle of gas flowmeter The thermal gas flowmeter mainly uses the principle of heat diffusion. The physical conditions of the thermal diffusion principle are mainly composed of two temperature-sensitive thermal resistors, one of which is used as a speed sensor and the other is used as a temperature sensor to realize the automatic compensation function for gas temperature changes. When the physical conditions are satisfied, the thermal gas flowmeter is in the normal working state. Once the gas flows through, the temperature sensor will increase or decrease its temperature to maintain the constant gas flow, so it can be controlled by the current in the circuit. The measurement of the gas is used to judge the flow rate of the gas. The faster the gas flow rate, the more heat it takes away, which reduces the temperature of the sensor. In order to keep the temperature constant, the current in the circuit increases; on the contrary, when the current in the circuit shows a decreasing trend, it indicates that the gas flow rate is also decreasing. The current presents a proportional relationship. Application of gas flowmeter The measurement of gas flow rate is actually applied in various fields. In terms of industrial production, the gas flowmeter can be used as a detection instrument for the process automation control system, and can also be used as a total meter for measuring the quantity of materials; Such as energy measurement, it is the only tool instrument in the process of energy management and economic accounting; in terms of environmental protection, it can be used for quantitative control of waste water and waste gas; in terms of biotechnology, it can be used for detection of blood, urine, etc.; in scientific experiments On the other hand, various measuring instruments are also required.
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have three basic components.

Coriolis vs. Magnetic Flow Meters: A Comprehensive Comparison

Introduction

Flow meters are crucial instruments used to measure the flow rate of various liquids or gases in industrial processes. Coriolis and magnetic flow meters are two popular types of flow meters, known for their accuracy and reliability. In this comprehensive comparison, we will delve into the differences and similarities between these technologies, exploring their working principles, applications, advantages, and limitations.

Working Principles

1. Coriolis Flow Meters

a. Overview

Coriolis flow meters operate based on the Coriolis effect, which is a phenomenon caused by the motion of liquids or gases in a rotating system. This effect results in a slight deflection of the fluid flow path when subjected to rotation. Coriolis flow meters exploit this principle to accurately measure the mass flow rate.

b. How they work

Inside a Coriolis flow meter, the fluid passes through a vibrating tube. The tube is forced to oscillate in a unique pattern due to the flow of the fluid. Sensors detect the angular deflection and analyze it to determine the mass flow rate. The greater the deflection, the higher the flow rate.

2. Magnetic Flow Meters

a. Overview

Magnetic flow meters, also known as electromagnetic flow meters, utilize Faraday's law of electromagnetic induction. These meters measure the volumetric flow rate of conductive fluids by generating a magnetic field across the flow tube and measuring the voltage induced in the fluid.

b. How they work

A magnetic flow meter consists of a flow tube lined with an insulating material and two pairs of electrodes placed opposite to each other. When the conductive fluid flows through the tube, a magnetic field is generated. As the fluid passes through the magnetic field, it induces a voltage proportional to the flow velocity. This voltage is then measured and used to calculate the volumetric flow rate.

Applications

1. Coriolis Flow Meters

Coriolis flow meters find widespread use in various industries due to their ability to measure both liquids and gases accurately. Some common applications include:

- Oil and gas production

- Chemical manufacturing and processing

- Food and beverage production

- Pharmaceutical production

- Petrochemical industry

2. Magnetic Flow Meters

Magnetic flow meters are particularly suitable for measuring the flow of conductive fluids. They excel in the following applications:

- Water and wastewater treatment plants

- Irrigation systems

- Mining operations

- Power generation

- Pulp and paper industry

Advantages and Limitations

1. Advantages of Coriolis Flow Meters

- Excellent accuracy for both liquids and gases.

- Capable of measuring mass flow rate directly.

- Offers simultaneous density and temperature measurement.

- Insensitive to fluid conductivity.

- Wide turndown ratio and low pressure drop.

Limitations of Coriolis Flow Meters

- Higher initial cost compared to other flow meter types.

- Susceptible to vibration and high-pressure environments.

- Complex installation and maintenance.

- Limited pipe size availability for larger applications.

2. Advantages of Magnetic Flow Meters

- Accurate measurement of conductive fluids.

- Wide range of pipe sizes available.

- No moving parts, resulting in minimal pressure loss.

- Suitable for dirty liquids and slurries.

- Insensitive to temperature and pressure changes.

Limitations of Magnetic Flow Meters

- Unsuitable for non-conductive fluids.

- Requires a minimum fluid velocity for accurate measurement.

- Electrodes can corrode in certain applications.

- External magnetic fields can interfere with measurements.

- High initial cost compared to some other flow meter types.

Conclusion

Coriolis and magnetic flow meters are both highly reliable and accurate instruments, but they operate on different principles and excel in different applications. Coriolis meters are advantageous in measuring mass flow rate, while magnetic flow meters are particularly suitable for conductive fluids. Understanding the specific requirements of your application is vital in selecting the most appropriate flow meter. Consider factors such as fluid type, flow range, installation constraints, and cost to make an informed choice.

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