The sewage electromagnetic flowmeter is a flowmeter for measuring flow according to Faraday's law of electromagnetic induction. The electromagnetic flowmeter is characterized by low pressure loss and large flow range. The ratio of the maximum flow to the minimum flow rate is generally 20:1 or more. The wide diameter of the industrial pipe diameter can be used to measure the diameter of the pipe in the DN10~DN2000 range. The output signal and the measured flow rate are linear, and the accuracy is high. It can measure the flow rate of acid, alkali, salt solution, water, sewage, corrosive liquid and mud, pulp, pulp, etc. with conductivity of more than 5 s/cm. Widely used in chemical, metallurgical, textile, paper, environmental protection, food, domestic sewage, industrial sewage, cooling water, water works and other industrial sectors, as well as municipal management, water conservancy construction, river dredging, building water supply metering and other areas of metering.
 

Two, product characteristics

 

Three, lining selection table

Lining material	main performance	Maximum medium temperature		Scope of application
		One body type	Separate type
Polytetrafluoroethylene (PTFE) F4)	It is a kind of plastic with very stable chemical properties. It can resist boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, and also strong alkali and various organic solvents. It is resistant to corrosion of three fluorine chloride, high temperature three fluorinated chlorine, high velocity liquid fluorine, liquid oxygen and oxygen.	70 C	100 C 250 C (special order required)	1, strong acid, alkali and other strong corrosive medium. 2, health media.
Polyfluoroethylene propylene F46)	with F4, the resistance to abrasion and negative pressure is higher than that of F4.		Ditto
Polyfluorinated ethylene Fs)	The upper limit of temperature is lower than that of polytetrafluoroethylene, but the cost is lower.		80 C
Polychloroprene rubber	1. It has excellent elasticity, high breaking force and good wear resistance. 2, resistance to general low concentration of acid, alkali, salt medium corrosion, do not withstand oxidation medium corrosion.		80 C 120 C (special order required)	Water, sewage and weakly abrasive slurry.
Polyurethane rubber	One It has excellent wear resistance.		80 C	Neutral strong wear slurry, coal slurry, mud
	Two Corrosion resistance is poor.

Four. Electrode selection table

Electrode materials	Corrosion resistance and wear resistance
Stainless steel0Crl8Nil2M02Ti	It has weak corrosive media for industrial water, domestic water and sewage. It is suitable for petroleum, chemical, steel and other industrial sectors, municipal, environmental protection and other fields.
Hastelloy alloy B	It has good corrosion resistance to all concentrations of hydrochloric acid below boiling point, and also is resistant to corrosion of non chlorinated acid, alkali and non oxidizing salt solution such as sulfuric acid, phosphoric acid, hydrofluoric acid and organic acid.
Hastelloy alloy C	It can resist the corrosion of non oxidizing acid, such as nitric acid, mixed acid, or the mixture of chromic acid and sulfuric acid, and also oxidizing salts such as: Corrosion of Fc +, Cu + or other oxidants, such as hypochlorite solution above normal temperature, corrosion of seawater.
titanium	Resistant to seawater, chloride and hypochlorite, oxidizing acids. (including fuming sulfuric acid), organic acid and alkali corrosion. The corrosion resistance of pure acid (such as sulfuric acid and hydrochloric acid) is not strong, but if the acid contains oxidant (such as nitric acid, Fc +, Cu +), the corrosion will be greatly reduced.
tantalum	It has excellent corrosion resistance and is similar to glass. In addition to hydrofluoric acid, fuming sulphuric acid and alkali, it is almost capable. Corrosion of a chemical medium, including hydrochloric acid at boiling point, nitric acid and sulfuric acid below 50 L. Diao in alkali; corrosion resistance.
Pt / Ti alloy	Almost all chemical media, but not suitable for aqua regia and ammonium salt.
Stainless steel coated tungsten carbide	For non corrosive, strong wear media.
Note: due to the variety of media, its corrosion is affected by complicated factors such as temperature, concentration and velocity. Therefore, this table is for reference only. The user should make his own choice according to the actual situation. If necessary, the decay test of the selected materials should be done, such as hanging film test.

Five. Type selection table.