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The selection of electromagnetic flowmeter is mainly based on the principle introduction

The English name of the flow meter is flowmeter, which is defined by the National Scientific and Technical Terminology Committee as a meter indicating the measured flow rate and/or the total amount of fluid in the selected time interval. Simply put, it is a meter used to measure the flow of fluid in a pipe or open channel.

The flowmeter is further divided into a differential pressure flowmeter, a rotameter, a throttle flowmeter, a slit flowmeter, a volumetric flowmeter, an electromagnetic flowmeter, an ultrasonic flowmeter, and the like. Classified by media: liquid flow meter and gas flow meter.

Metrology is the eye of industrial production. Flow measurement is one of the components of metrology science and technology. It has a close relationship with the national economy, national defense construction, and scientific research. Doing this work will play an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology, especially in the current era of energy crisis and industrial automation. Flowmeters are in the national economy. The status and role of the more obvious.

1) According to the characteristics of the integrated and separate (body) type electromagnetic flowmeter, choose the appropriate type. The integrated electromagnetic flowmeter is easy to install and cable, but the accuracy is low. It is suitable for occasions where the measurement accuracy is not very high. The separation (body) type electromagnetic flowmeter has high precision, but the installation and cable laying requirements are strict. In the case where the measurement accuracy is high, or the measurement pipe is located below the ground or in the air (the sensor is installed in the measuring pipe, the converter is installed on the ground or convenient for maintenance). Since the nitrophosphate fertilizer device process is not very demanding on the accuracy of most flowmeters, most of the electromagnetic flowmeters that are technically modified or newly added use an integrated electromagnetic flowmeter. The two electromagnetic flowmeters used for measurement and accounting select separate electromagnetic flowmeters. meter.

2) Select the appropriate electrode form. For clean media without crystallization and non-stick electrodes, use standard electrodes, such as nitric acid solution, process condensate, etc. For the measurement of crystal-containing or viscous slurry, the electrode may be contaminated with foreign matter and may even be worn. Adjustable electrode for electrode disassembly, cleaning or replacement, such as compound fertilizer slurry, mother liquor and ammonium nitrate solution.

3) Select the electrode material according to the corrosiveness of the medium to be measured. The liquid medium of the nitrophosphate fertilizer device is mostly a nitric acid solution or an acidic medium containing nitric acid. The electrode materials are generally selected from stainless steel or Hastelloy C (HC); however, the crystal melt which enters the calcium nitrate filtration process due to the crystallization process contains a large amount of acid insoluble matter. In order to resist wear, the electrode material of the electromagnetic flowmeter is made of platinum-alumina ceramic.

4) Select the lining material according to the corrosiveness, wear and temperature of the medium to be measured. The liquid medium of the nitrophosphate fertilizer device is an acidic liquid or slurry of <200 ° C, so PTFE lining is generally used; the crystallization process enters the crystal melt of the calcium nitrate filtration process because it contains a large amount of acid insoluble matter, which is wear resistant. Therefore, ceramic lining is used.

5) Select the nominal pressure of the electromagnetic flowmeter according to the highest pressure of the measured medium. The nominal pressure of the electromagnetic flowmeter used in the modification of the nitrophosphate fertilizer plant was selected to be 4 MPa.

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