Intelligent anticorrosive electromagnetic flowmeter
is often used in the industrial production of the flowmeter types, because many have a corrosive liquid raw materials used in industry, such as dilute sulphuric acid, hydrochloric acid, hydrofluoric acid, for different corrosive medium, be about to choose when we measure the corresponding measuring instrument, intelligent anticorrosive electromagnetic flowmeter on the selection of anticorrosive materials need to be adapted to the petroleum chemical industry, steel, metallurgy, water supply and drainage, irrigation, water treatment, environmental protection sewage total amount control, paper making, medicine, food and other industrial and agricultural departments of the production process flow measurement and control.
From measuring instrument of steel tubes to measuring electrode, has a strict matching criteria, how to correctly select the corresponding materials, for the friend that work in the construction and measuring instrument is one must master the basic knowledge.
The following brief introduction for everyone, detailed material choice and related knowledge can be visit our site:, or call 0517 -
* first to talk about smart anti-corrosion lining anti-corrosion type electromagnetic flowmeter selection: the choice of electromagnetic flowmeter lining material has three key elements, that is corrosion resistance, abrasiveness of measured medium temperature.
Intelligent electromagnetic flowmeter lining material basically has: natural rubber;
And network PFA.
Users should according to the measured medium corrosion resistance, wear resistance and temperature to choose suitable lining materials.
Natural rubber (
Application: 1, good flexibility, wear-resistant and pull force;
2, generally weak acid, weak alkali corrosion resistance;
The water and sewage acid-resistant rubber (
Applications: resistant to temperature of hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid, and 50% of sulfuric acid, sodium hydroxide, potassium hydroxide, corrosion, but not the corrosive action of strong oxidizer, general measurement of acid, alkali, salt solution neoprene (
Applications: 1, good elasticity, high break strength, wear-resisting performance is good;
2, generally low concentration of acid and alkali resistance, corrosion of the salt solution, but not the oxidation resistance of medium;
For water, sewage and mud and slurry.
Polyurethane rubber (
Applications: 1st, excellent wear resistance.
2, acid, alkaline poor can < 40 ℃;
Neutral strong abrasion of coal slurry, mud and slurry polytetrafluoroethylene (
Applications: 1, resistance to boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, strong alkali and a variety of organic solvents;
2, wear-resisting performance is good, adhesive performance is poor;
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Concentration measurement, strong alkali, strong corrosive solution and medium health class.
Because there are many different kinds of medium and its corrosion resistance and affected by complex factors such as temperature, concentration, flow velocity and change, so the data in this table is for reference only.
Users should according to actual situation to make the choice of the intelligent electromagnetic flowmeter lining, when necessary, should be to choose material corrosion test, such as coupon test.
The second is for smart anti-corrosion type electromagnetic flowmeter selection of anticorrosive electrodes: when choosing electrode material, want to consider the corrosion resistance of the measured medium, typically one level higher than process piping material.
Ground loop can choose the same as the electrode material, selection and process piping can also be of the same material as a ground loop.
Process piping insulation coating for metal pipe and lining, don't choose grounding ring.
Instructions are as follows: 1, stainless steel, code-named 316 l, used for industrial water, water, sewage and other weak corrosive medium and neutral solution and carbonic acid, acetic acid, weak acid, etc.
2, hartz alloy C code HC, the oxidation resistance of acid, such as the mixture of nitric acid and chromic acid and sulfuric acid.
Also the oxidation resistance of salt corrosion or contain other oxidizing environment.
In sea water, alkali solution, chloride solution with good corrosion resistance.
3, hartz alloy B, codenamed HB, for non oxidizing acid such as sulfuric acid, phosphoric acid, hydrofluoric acid, alkali, salt has good corrosion resistance.
4, titanium, code Ti, seawater, all sorts of chloride and hypochlorite, and a variety of hydroxide of corrosion.
5, tantalum, codenamed Ta, except hydrofluoric acid, can almost everything the corrosion of chemical medium.
Because of its expensive price, only for hydrochloric acid and sulfuric acid.
This paper released by embellish instrument science and technology in finishing.
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