Electromagnetic flowmeter in the proper selection of material
Electromagnetic flowmeter is a kind of commonly used industrial automation flow measuring instrument, the selection of its material is also an important factor.
Because the electromagnetic flowmeter, Parts in contact with the medium with only the interior of the electrode and the measuring tube.
According to the different characteristics of the measured medium, so need to choose the right electrode electromagnetic flowmeter and lining material.
一, on the choice of electrode material
General electrode material points the following kinds:
1. Stainless steel (0 cr18ni12mo2ti). Suitable for nitric acid, less than 5% of the sulfuric acid at room temperature, boiling phosphoric acid, formic acid and alkali solution, under certain pressure of sulfurous acid, water and acetic acid.
2. B, hartz alloy C hartz alloy. Can be used for sea water and brine.
3. Titanium. Seawater, apply to all kinds of chloride and hydrochloric acid, chloride oxidizing acid (including fuming nitric acid), organic acid, alkali, etc.
4. Tantalum. Except hydrofluoric acid, fuming sulfuric acid and alkali of the rest of the chemical substances, including the boiling point of hydrochloric acid and nitrate
二, about the choice of lining material
Electromagnetic flowmeter of another important material choice is: how to properly choose lining material. Must pay attention to is, should according to the measured medium erosion resistance, abrasion resistance and temperature to choose lining materials.
1. Rubber. Has the very good elasticity, high breaking strength, wear-resisting function is good, the erosion of general weak acid weak base, can be measured, such as water, sewage and mud and slurry.
2. Polyurethane. Has excellent abrasion resistance, acid resistance, alkali function is poor, can measure neutral strong wear of coal slurry and the mud and slurry.
3. The ptfe. Resistance to boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, strong alkali and a variety of organic solvents, good wear-resisting function, poor adhesion function.
Above is the electromagnetic flowmeter, the choice of material of different medium has different characteristics, don't have to choose the most expensive, choosing the right is the economic and durable.