What are the alarm parameters of electromagnetic flowmeter, flowmeter, electromagnetic flowmeter, se

Guangzhou Honghai Automation Instrument Co., Ltd. is a high-tech enterprise integrating R&D, production, sales and service, dedicated to sensors, control instruments and system engineering control. With many years of understanding and knowledge in the field of sensors, our company has always adhered to the corporate philosophy of "independent innovation and quality-oriented". To provide customers with excellent pre-sales and after-sales service, and always adhere to providing perfect products and system solutions to meet customer needs to a greater extent.

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This involves the selection of electromagnetic flowmeters, which is nothing more than the following considerations:

1. Flow: According to the maximum flow rate, determine how much scale flow rate should be selected.

2. Determine the caliber of the flowmeter according to the flow rate and the size of the industrial pipeline. Generally, a flow meter that is consistent with the pipeline is selected.

3. According to the characteristics of the measured medium, select the lining of the flowmeter. For example, temperature, corrosiveness, whether there may be negative pressure in the pipe, etc. Generally, the lining is PTFE, soft rubber, hard rubber, PFA, ceramics and so on.

4. Select the material of the measuring electrode according to the characteristics of the medium. Generally, there are , Hastelloy, titanium, tantalum, etc.

5. Select the pressure level of the flanges connected on both sides according to the pressure level of the process pipeline.

6. Select the protection level, if the sensor is under water, you need to select IP68

The above is the sensor part. Then there's the transmitter part.

1. According to the requirements of the installation location, determine whether to choose the integrated type or the split type.

2. What type of output is required, 4-20 mA signal, HART, PROFIBUS PA, FF, etc.

3. Whether explosion-proof requirements are required. Determine the explosion protection level.

Why do you need to alarm, go online, offline, excitation, empty tube,

The following factors need to be considered when using an electromagnetic flowmeter in a sewage project:

Flow range: First of all, the flow range of the sewage treatment system should be considered, and the electromagnetic flowmeter selected should be able to meet the measurement needs within this range.

Measurement accuracy: In wastewater treatment systems, flow accuracy is critical to controlling the flow of water and the treatment process. Therefore, an electromagnetic flowmeter with high accuracy should be selected.

Measurement medium: Sewage may contain some solid particles, bubbles and other impurities, which will affect the measurement accuracy of the flow meter. Therefore, it is necessary to choose an electromagnetic flowmeter that can adapt to the sewage medium, such as an electromagnetic flowmeter with a self-cleaning function.

Corrosion resistance of materials: The media in the sewage treatment system are usually high concentrations of chemicals and acids and alkalis, so it is necessary to choose electromagnetic flowmeters made of corrosion-resistant materials, such as stainless steel.

Environmental adaptability: Wastewater treatment systems are often exposed to harsh environments, such as high temperatures, high humidity, and corrosive gases. Therefore, it is necessary to choose an electromagnetic flowmeter with good environmental adaptability, such as an electromagnetic flowmeter with the functions of waterproof, dustproof and anti-corrosion.

In summary, there are many factors that need to be considered in the selection of electromagnetic flowmeters suitable for sewage treatment systems to ensure the reliability and accuracy of the flowmeters and improve the operational efficiency of the sewage treatment system.

The selection of electromagnetic flowmeter is divided into the selection of caliber and range, the selection of temperature and pressure, the selection of lining materials and electrode tree materials, and the selection of converter caliber is usually consistent with the pipeline system. If the piping system is to be designed, the diameter can be selected according to the flow range and flow rate. The range of the converter can be selected according to two principles:

One is that the full-scale range of the instrument is greater than the expected greater flow value; Second, the normal flow rate is greater than 50% of the full range of the instrument to ensure the corresponding measurement accuracy.

2. Selection of temperature and pressure.

There are limits to the fluid pressure and temperature that can be measured by an electromagnetic flowmeter. When selected, the operating pressure must be lower than the working pressure specified by the flow meter. If there are special requirements for the withstand voltage of the converter, you can negotiate with the manufacturer.

The operating temperature of the electromagnetic flowmeter depends on the lining material used.

3. Selection of lining materials and electrode materials.

Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: Why does the electromagnetic flowmeter have an alarm and how to deal with it:

Why does the electromagnetic flowmeter have an alarm, and how to deal with it: 1. Measure whether the fluid fills the measuring tube; 2. Use the wire to connect the converter signal to the terminal SIG1, SIG2 and SIGGDN three-point short circuit"If the prompt is revoked, it means that the converter is normal, and it may be that the bottom of the conductivity of the measured fluid or the threshold value of the empty pipe and the range of the empty pipe are set incorrectly; 3. Check whether the signal cable is connected correctly; 4. Check whether the sensor electrode is normal; 5. Make the flow rate zero, and the observation shows that the conductivity ratio should be less than 100%; 6. In the case of current, the resistance of the terminals Sig1, Sig2 and Siggdn should be less than 50K. 7. The DC voltage between DS1 and DS2 should be less than 1V when measured with a multimeter, otherwise, the sensor electrode is polluted and should be cleaned.

Why does the electromagnetic flowmeter have an alarm and how to deal with it?

Dear, I'm honored to have your question The information that the teacher found for you here is: why does the electromagnetic flowmeter have an alarm and how to deal with it: why does the electromagnetic flowmeter have an alarm and how to deal with it is 1. Measure whether the fluid is full of the measuring tube; 2. Use the wire to connect the converter to the terminal SIG1, SIG2 and SIGGDN at three points"The prompt is revoked, indicating that the converter is clear, and it may be that the bottom of the conductivity of the measured fluid or the threshold of the empty pipe and the range of the empty pipe are set incorrectly; 3. Check whether the signal cable is connected correctly; 4. Check whether the sensor electrode is normal; 5. Make the flow rate zero, and the observation shows that the conductivity ratio should be less than 100%; 6. In the case of current, the resistance of the terminals Sig1, Sig2 and Siggdn should be less than 50K.

7. The DC voltage between DS1 and DS2 should be less than 1V when measured with a multimeter, otherwise, the sensor electrode is polluted and should be cleaned by Answerzensheng.

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What are the common fault phenomena of electromagnetic flowmeter, what are the reasons why there is a flow rate but the electromagnetic flowmeter does not display? There are three reasons: First, is the display screen on?

First make sure there is a power supply? If the power supply is normal and the display screen is not lit, it means that the meter head of the electromagnetic flowmeter is burned, or the display screen is broken, and it needs to be returned to the original factory for repair or replacement. Two.

The display screen is bright, and you can see that the flow rate is worth it, there is fluid flow in the pipeline, but there is no normal flow, there are two situations, first, the flow rate is lower than the lower limit of the flow meter calibration, and the flow meter cannot measure the small flow. Therefore, the normal flow value is not displayed. Second, if there is a problem with the internal settings, you can consult the original engineer to solve it.

Third, the flowmeter body is flooded, resulting in the electrode not working normally, and the flow rate may not be displayed. According to the above three points, you compare them to see which situation it is. You can tell why the flow meter does not display.

1. Application of sewage electromagnetic flowmeter.

Large-diameter electromagnetic flowmeters have a wide range of applications in water supply and drainage engineering. According to the use, it can be divided into large diameter, small diameter, small diameter and small diameter. Medium and small diameter measuring instruments are often used in places where it is difficult to measure fluids or have high requirements, such as the measurement of pulp and black liquor in the paper industry, the measurement of non-ferrous metal metallurgical slurry and coal slurry, etc.

Coal preparation plants, chemical enterprises and industries with strong corrosive liquids, iron and steel companies carry out blast furnace tuyere cooling water system control, long-distance pipeline coal hydraulic transmission network flow measurement and control, etc. Small calibers and small calibers are often used in fields that require health, such as medicine, food, and bioengineering.

2. The accuracy level and function of the sewage electromagnetic flowmeter.

Some of the high-precision, versatile, and versatile EMFs on the market make a big difference in performance. Some work with low precision, and the function is simple to perform. The basic error of high-precision instruments is ( , and the basic error of low-precision instruments is ( ** difference of 12 times.

Therefore, it is not cost-effective to select a high-precision instrument that does not require high measurement accuracy (e.g., non-accounting, only high reliability and good and bad repeatability for control purposes). Basic Information Error ( However, due to the absence of stringent equipment requirements and important reference to other conditions, there are different models of instruments that claim to have a higher accuracy.

3. The conductivity of the liquid return file of the sewage electromagnetic flowmeter.

The premise of EMF is that the liquid to be measured must be electrically conductive and not below a threshold (lower limit). Conductivity below the threshold will have an impact on the measurement of systematic error even we can not use, even if there is no change to develop beyond the threshold can be measured, the error value changes little to the effect, generally the threshold of EMF is 10 of -4 (5x10 of -6)s cm, depending on the model. The use also depends on the flow rate between the temperature sensor and the converter, the length of the signal line and its main distribution, and the capacitance.

In the manufacturer's instruction manual, we usually specify the length of the signal line corresponding to the conductivity. Instruments with non-contact, capacitively coupled, large-area electrodes can measure liquids with conductivity as low as 5x10-8s cm.

4. The flow, full flow, range and caliber of the sewage electromagnetic and flowmeter.

It should depend on the flow rate. The process is carried out by industrial enterprises to transport water and other liquids with different viscosities of users, and the diameter of the selected instrument may be different from the diameter of the pipe. The design flow rate of the pipeline is generally carried out at the economic horizontal flow rate of EMF.

In this tube, the sensor diameter can be the same as the tube diameter. For fluids that are easy to adhesion, accumulation, scaling and other substances, the flow rate is generally not less than 2m s and should be increased to more than 34m envy s as much as possible to play a self-cleaning role and prevent adhesion and chemical deposition. For abrasive fluids such as pulp, the general flow rate should be less than 23 ms to reduce the wear of the liner and electrodes.

The types of flowmeters have electromagnetic, differential pressure and other principles, in the flow measurement, the accuracy of the differential pressure flowmeter is higher, and the temperature and pressure are also adaptable.

It is a very accurate type, the characteristics of electromagnetic flowmeter: 1. The measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity; 2. There are no obstructed flow parts in the measuring tube, no pressure loss, and the requirements for the straight pipe section are low. Unique adaptability to slurry measurement;

Electromagnetic flowmeter instrument, liquid electromagnetic flowmeter, excellent quality, on-site selection, guidance selection, guidance installation and maintenance, flow analysis, rest assured selection, 15-year-old brand, on-site guidance.

Electromagnetic flowmeter is a kind of flow measuring instrument, mainly used for clean water, sewage, domestic water, raw water, various acids, alkalis, salts and other solutions, mud, mineral pulp, pulp and food.