Electromagnetic flowmeter installation structure and diameter and electrode selection
Electromagnetic flowmeter installation structure and diameter and electrode selection and installation structure The electromagnetic flowmeter main unit and sensor are assembled together to form an integrated electromagnetic flowmeter; or connected to the flow sensor through a signal cable to form a split electromagnetic flowmeter. The split converter is mounted on a wall or bracket. Caliber selection When the flow rate of the measuring pipe is more than 0.5 m/s, select the flow meter of the same diameter as the measuring pipe. The flowmeter with a diameter smaller than the measuring pipe is selected in the following cases: the flow rate in the measuring pipe is slow, and the measuring requirement of the flowmeter cannot be met or the measuring accuracy cannot be satisfied at the flow rate (to obtain relatively high precision, the lower limit of the flow rate should be greater than 1 m) /s). Electrode material selection 1. Stainless steel 316L: used for weak corrosive medium and neutral solution such as industrial water, domestic water, sewage, etc. and weak acid such as carbonic acid and acetic acid. 2. Titanium: Corrosion resistance to seawater, various chlorides and hypochlorites and multiple hydroxides. 3. Hastelloy C: an oxidation resistant acid such as nitric acid, mixed acid, a mixture of chromic acid and sulfuric acid. Also corrosive to the environment of oxidizing salts or other oxidants. Good corrosion resistance to seawater, alkaline solution and oxide solution. 4. Hastelloy B: has good corrosion resistance to non-oxidizing acids and alkali salts such as sulfuric acid, phosphoric acid and hydrofluoric acid. 5. é’½: In addition to hydrofluoric acid, it is almost resistant to corrosion by all chemical media. Because of its high price, it is only used for hydrochloric acid and concentrated sulfuric acid. 6. Tungsten Carbide: It has excellent wear resistance and is designed for wear media such as mud and pulp. |
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