Electrode electromagnetic flowmeter and the lining material is introduced
Electromagnetic flowmeter with direct contact with the two parts of the measured medium electrode and lining material selection is crucial in selection. Henan cisco measurement and control technology co., LTD. In this article focuses on the electrode electromagnetic flowmeter and the lining of various materials.
Electrodes (electrode) :
1 / AISI316Ti (stainless steel) : the nature of a very good general purpose metal, applicable to the standard of water, not suitable for the corrosive liquid, does not apply to acid, alkali. Electrode surface permeability of ceramic coating to reduce electrode noise. (e.g., reduce the electrode noise such as pulp) - applies to standard not corrosive liquid, such as food, beverage and paper pulp.
2 / Hastelloy C - 276 C (hartz alloy) : superior grade stainless steel, with good resistance to chemical corrosion characteristics. - suitable for corrosive of weak acid and weak base.
3 / Platinum, Iridium, Platinum/Iridium) (80/20) : excellent electrode materials, suitable for most of the liquid. Excellent chemical corrosion resistance because of the alloy containing larger proportion of platinum, iridium is only used to strengthen the mechanical strength of electrode. - suitable for most of the corrosive liquid.
4 / Monel (Mooney, alloy) : has the very good resistance to salts, water and alkali corrosion resistance. Acid as the case may be.
5 / Titanium (ti) : be self-healing thin oxide film layer, has the strong corrosion resistance. For some acid, such as nitric acid or trivalent chromate extremely suitable; But not suitable for sulfuric acid or hydrochloric acid. The most applicable to chlorine and chlorous acid, and often used in the fiber bleaching industry severely corrosive industries. Corrosion resistance is better than platinum/iridium electrodes.
6 / Tantalum (ta) : a kind of very good resistance to acid corrosion of metal. Often used in the chemical industry. Except hydrofluoric acid, the most acid. And not soluble in aqua regia. Soluble in the mixture of nitric acid and hydrofluoric acid solution, and, in the case of more than 175 degrees can react with chlorine. Poor wear resistance.
Attention! Don't choose in using tantalum electrode under the condition of cleaning unit. Because in tantalum form a thin layer on the surface of the oxide layer to prevent internal corrosion of metal. Electrode, the use of cleaning unit can destroy the oxide layer.
Liner (lining) :
1 / Neoprene (cr diene rubber) : applied to the oil sewage, 0-95 degrees, has excellent abrasion resistance, oil resistance and some solvents.
2 / EPDM (synthetic rubber) : used in health industry. - 10 - + 95 degrees, medium resistance to wear.
3 / PTFE (Teflon (PTFE) : smooth, excellent chemical resistance. - 20 - + 180 degrees, little precipitation, more expensive (especially the large diameter) DN400 above hard work. Often used in health industry. No solvent resistance.
4 / Polyurethane (PU) (Polyurethane) : smooth; Resistance to solvent, oil and grease; 0 degrees to 50 degrees; Excellent abrasion resistance, suitable for sand, silt and other wear particles; For many liquid chemical corrosive resistance; But for some chemical expansion.
5 / Natural rubber (Natural rubber) : also called "soft rubber"; Have an effect on oil and solvent; 0-70 degrees; Good abrasion resistance, especially suitable for sand, silt and particles.
6 / Ebonite (hard rubber) : medium resistance to wear; 0-95 degrees; Without solvent resistance; Resistance to acid, alkali.