Application of DN300 Electromagnetic Flowmeter in Industrial Piping System

DN300 electromagnetic flowmeter is a commonly used flow measurement instrument. With the rapid development of modern fine chemical technology, it is more and more widely used in petrochemical, papermaking, metallurgy, environmental protection, food and other industries. Electromagnetic flowmeters are used for fluid monitoring of complex industrial piping systems, real-time monitoring of raw materials and finished products of the system, and providing basis for automated control of the system.

Because the electromagnetic flowmeter is distributed and dispersed, and the operating environment is relatively complex, its installation process may affect its operating conditions and the probability of failure, which may affect the operation of the entire instrument control system. Therefore, the analysis of the principle of the electromagnetic flowmeter, the study of the installation process, and the constant summaries and updates of the debugging technology are necessary.

Caliber selection

When selecting an electromagnetic flowmeter, the selected aperture is generally determined by the nature of the fluid, the flow rate, and other factors.

In general, when the flow rate of the pipeline is 0.5 to 1.5m/s, it is recommended that if the fluid medium has less wear on the sidewall, the long-term flow rate should be greater than 3m/s, but it should be less than 7m/s. Diameter flowmeter.

Lining material selection

Electromagnetic flowmeters are mainly used to measure the flow of fluids. According to the corrosivity, wearability, temperature, and condensation of the measured substances, flowmeters with different liners should be selected [2].

The lining materials commonly used in DN300 electromagnetic flowmeters and their characteristics are described below.

1) Natural rubber, its temperature range is -10 °C ~ 70 °C, wear resistance, good insulation properties, corrosion resistance in general.

2) Neoprene rubber has better elasticity than natural rubber and is also more wear-resistant, but its cold resistance is poor.

3) Polyurethane rubber, applicable temperature lower than natural rubber, up to -25 °C.

4) NBR is more resistant to high temperatures, more wear resistant and less elastic than natural rubber, but its oil resistance is quite good.

5) Polytetrafluoroethylene is a kind of plastic. It has excellent acid and alkali resistance, but it has poor resistance to partial liquid fluorine, oxygen, ozone and other non-normal substances such as corrosion and negative pressure. It also has good wear resistance. Poor.

Electrode material selection

The electrodes of the DN300 electromagnetic flowmeter are mounted on the inner wall of the pipe and are in direct contact with the measured substance. Therefore, the electrode should be selected according to the corrosivity of the measured substance. Materials commonly used for the manufacture of electrodes include: titanium (Ti), strong acid resistance; tantalum (Ta), high measurement accuracy; platinum-antimony (Pt-Yi) alloy, strong corrosion resistance; Hastelloy C (HC), Can be used for high temperature measurement of hypochlorite, sulfuric acid, nitric acid; 316L, corrosion resistance in general, but low prices.

When selecting the electromagnetic flowmeter, the selection of electrode materials should be based on the precision requirements of the measurement, the corrosivity of the measured object, and the price bearing capacity [3].

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