The electromagnetic flow meter ordered by a chemical factory in Shouguang has been prepared and shipped. 

There are three types of electrodes: HC electrode, tantalum electrode, and 316L electrode. How to choose electrodes correctly is a problem that many procurement personnel are confused about. Today, we will discuss with everyone the selection of electrodes for electromagnetic flow meters.

Magnetic flow meters have excellent characteristics such as high accuracy, small pressure loss, and strong anti-interference ability. They are suitable for various conductive liquids such as acid, alkali, salt solutions, pulp, and sewage. They are widely used in industries such as petroleum, chemical, textile, food, pharmaceutical, papermaking, environmental protection, water supply and drainage, and sewage treatment. In actual production, there are various types of electrodes for different media, and improper selection can lead to numerous issues such as cost accounting and trade disputes. Therefore, the selection of electrodes is particularly important. So, how to choose the right electrode?

Electrode selection

316L electrode: suitable for domestic water, industrial water, raw water, well water, and urban sewage; Weak corrosive acid, alkali, salt solution.

Hastelloy B: suitable for non oxidizing acids such as hydrochloric acid (concentration less than 10%); Sodium hydroxide (concentration less than 50%), ammonium hydroxide alkali solution of all concentrations; Phosphoric acid, organic acid. Not applicable: nitric acid.

Hastelloy C: Suitable for mixed acids, such as mixed solutions of chromic acid and sulfuric acid; Oxidative salts, such as Fe++, Cu++, seawater. Not applicable: hydrochloric acid.

Titanium electrode: Salt, such as (1) oxide (oxide/magnesium aluminum/calcium/ammonium/iron, etc.). (2) Sodium salt, potassium salt, Hypochlorite, seawater; The concentration is less than 50% potassium hydroxide, ammonium hydroxide, Barium hydroxide alkali solution; Not applicable: reducing acids such as hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, etc.

Tantalum electrode: hydrochloric acid (solution less than 40%), dilute sulfuric acid and concentrated sulfuric acid (excluding Oleum); Chlorine dioxide, Iron(III) chloride, Hypochlorous acid, Sodium cyanide, Lead(II) acetate, etc; Oxidative acids such as nitric acid (including fuming nitric acid), as well as aqua regia and hydrofluoric acid at temperatures below 80 degrees Celsius.

Platinum iridium alloy electrode: almost all acid, alkali and salt solutions (including fuming nitric acid and Oleum). Not applicable: aqua regia, ammonium salts.

Tungsten carbide electrode: medium with high wear, pulp, sewage, Mineral acid, organic acid and chloride that can resist interference of solid particles.