Electromagnetic flowmeters are classified according to their uses and can be divided into general-purpose electromagnetic flowmeters, explosion-proof electromagnetic flowmeters, sanitary electromagnetic flowmeters, and submersible electromagnetic flowmeters. The following describes where the explosion-proof type is used. Explosion-proof electromagnetic flowmeters are used in places with flammable atmospheres. Due to the large current energy of most electromagnetic flowmeters, they are usually designed as flameproof type, sand-filled type, potting type and air-tight type. However, the excitation power of the current electromagnetic flowmeter is greatly reduced, and there is also an intrinsically safe type, that is, the so-called safe spark type. The flow sensor part and the converter part are conditionally integrated and all installed in the dangerous area.
Selection method of explosion-proof electromagnetic flowmeter:
1. When selecting an electromagnetic flowmeter, the first thing to know is the measuring medium. This is very important. Only after understanding the measuring medium can the model continue to be selected. Otherwise, the produced electromagnetic flowmeter cannot be used or has a service life. reduce.
2. After knowing the medium, it is necessary to locate the installation on site. It depends on the situation of the site, which installation form needs to be used: 1. Flange installation, 2. Plug-in installation, 3. Clamping installation, 4. Threaded installation.
3. The size of the nominal diameter, according to the diameter of the pipeline, the maximum diameter of the electromagnetic flowmeter can reach DN3000, due to objective factors, it can also be customized according to site requirements.
4. The selection of electrode material and lining material is based on the measurement medium, whether the medium is corrosive, whether the medium contains impurities, and whether the medium is hygienic. Generally, these need to be selected according to different types. the medium to select.
5. What is the working pressure? If it is some conventional measurement of sewage or other water treatment, it is the standard pressure, including temperature, which can be directly defaulted when selecting a model.
6. Output signal, this is one of the key points, it needs remote transmission or local display, electromagnetic flowmeter can do it, and there is power supply, such as 24V or 220V (85-265V).
7. Protection level and explosion-proof requirements, such as some chemical hazardous places, need this explosion-proof requirement, which needs to be explosion-proof during production to meet the explosion-proof requirements.