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What electrode is used for electromagnetic flow meter matching for acidic and alkaline industrial wastewater?
2021-07-15
The wastewater discharged by industrial production enterprises, some are acidic, some are alkaline, some are oxidizing, some are corrosive, some are particulate impurities... Generally, electromagnetic flow meters are used for flow control and measurement. But there are 316L, HaC, HaB, tantalum, titanium, platinum iridium alloy, and tungsten electrodes for electrode flow meters. How should we choose so many electrodes? Is it related to the pH value of the medium?
Today, Weifang Aobo Instrument will introduce the electrode selection of intelligent ABDT-LD electromagnetic flowmeter, as shown in the following figure.
Electrode material selection
The wastewater discharged by industrial production enterprises, some are acidic, some are alkaline, some are oxidizing, some are corrosive, some are particulate impurities... Generally, electromagnetic flow meters are used for flow control and measurement. But there are 316L, HaC, HaB, tantalum, titanium, platinum iridium alloy, and tungsten electrodes for electrode flow meters. How should we choose so many electrodes? Is it related to the pH value of the medium?
Today, Weifang Aobo Instrument will introduce the electrode selection of intelligent ABDT-LD electromagnetic flowmeter, as shown in the following figure.
| Electrode material | Features and use scope |
| 316L | Applicable: |
| 1. Domestic water, industrial water, raw water, well water and urban sewage. | |
| 2. Weak corrosive acid, alkali and salt solution. | |
| Haynes metal B | Applicable: |
| 1. The hydrochloric acid (concentration is less than 10%) and so on non-oxidized acids. | |
| 2. Sodium hydroxide(concentration is less than 50%), all concentrations of ammonium hydroxide alkali solution. | |
| 3. Phosphoric acid, organic acid. | |
| Not applicable: | |
| Nitric acid. | |
| Haynes metal C | Applicable: |
| 1.Mixed acid, such as the mixed solution of chromic acid and sulfuric acid. | |
| 2. Oxidation salts such as Fe+++, Cu++, sea water. | |
| Not applicable: | |
| the hydrochloric acid. | |
| Ti | Applicable: |
| 1. Salt, such as (1) chloride (chloride/magnesium and aluminum/calcium/ammonium/iron, etc.)；(2) Sodium salt,potassium salt, hypochlorite salt, sea water. | |
| 2.Potassium hydroxide, amine hydroxide and barium hydroxide alkali solution whose concentration are less than 50%; | |
| Not applicable: | |
| hydrochloric acid, sulfuric acid, phospic acid, hydrofluoric acid and other reductive acid. | |
| Ta | Applicable: |
| 1. Hydrochloric acid (concentration is less than 40%), dilute sulfuric acid and concentrated sulfuric acid (excluding fuming sulfuric acid); | |
| 2. Chloride dioxide, iron chloride, hypochlorite,sodium cyanide, lead acetate, etc.; | |
| 3. Nitric acid (including fuming nitric acid) and other oxidizing acid, aqua regia whose temperature is less than 80 degrees; | |
| Not applicable: | |
| alkali, hydrofluoric acid. | |
| Platinum-iridium alloy | Applicable: |
| Almost all acid, alkali and salt solutions (including fuming nitric acid, fuming sulfuric acid) | |
| Not applicable: | |
| aqua regia, ammonium salt. | |
| Tungsten carbide | Applicable: |
| large worn medium,paper pulp,sewage,resistant to interference of solid particles; | |
| Not applicable: | |
| inorganic acid, organic acid, chloride. |
When using an electromagnetic flow meter to measure liquid flow, the appropriate electrode should be strictly selected according to the diagram above, otherwise it may cause electrode damage, inaccurate measurement, and thus cause certain economic losses. If you have any selection needs, you can contact us, and Weifang Aobo Instrument will be happy to serve you.
