1.** Flow range * *:
-Determine the required flowmeter range according to the maximum flow rate, minimum flow rate and flow rate of the measured fluid during normal operation. Ensure that the selected flowmeter can cover the expected flow range.
2.** Pipe size * *:
-The diameter of the flowmeter should match the size of the process pipeline to ensure the measurement accuracy and reduce the pressure loss. Sometimes it may be necessary to use a reducer for connection.
3.** Media characteristics * *:
-Conductivity: Electromagnetic flowmeter can only be used to measure conductive liquid, so the medium must have sufficient conductivity.
-Temperature and pressure: The working temperature and pressure of the flowmeter shall be within the technical parameters allowed by the instrument.
-Physical and chemical properties: such as corrosiveness, abrasion, viscosity, solid content, bubble content, etc. This will affect the selection of electrode materials and lining materials.
4.** Lining material * *:
-According to the characteristics of medium and working environment, select appropriate lining materials (such as PTFE, rubber, ceramics, etc.). ) protect the electrode to ensure long-term stable operation.
5.** Electrode material * *:
-Choose corrosion-resistant electrode materials according to the corrosiveness of the medium, such as stainless steel, Hastelloy, titanium, tantalum, etc.
6.** Accuracy grade * *:
-Select the appropriate accuracy level according to the application requirements, and different industrial applications have different accuracy requirements.
7.** Protection level and explosion-proof requirements * *:
-According to the environmental conditions of the installation site, confirm whether the flowmeter needs specific protection level and explosion-proof certification.
8.** Functional requirements * *:
-Whether two-way flow measurement, up-and-down alarm, air traffic control detection, fault diagnosis, data communication and other functions are needed.
9.** Installation method * *:
-Consider whether the flowmeter is integrated or split, and whether the installation position needs special configuration, such as vertical or horizontal installation, straight pipe length requirements, etc.
10.** Power supply and output signal * *:
-Determine the power supply voltage requirements and output signal types (such as 4-20mA analog signals, pulse signals and digital communication interfaces, such as HART, MODBUS and PROFIBUS).
In a word, all the above factors should be considered comprehensively when selecting electromagnetic flowmeter in specific application, so as to ensure that the flowmeter meets the technical requirements, adapts to the field working conditions and realizes accurate and reliable flow measurement.