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Home Parts Flow Meter SupportsElectrode and Lining Materials Selection for Electromagnetic Flow Meters

Electrode and Lining Materials Selection for Electromagnetic Flow Meters

Flow Meter

Electrode and Lining Materials Selection for Electromagnetic Flow Meters

Basis for Selecting Electrode and Lining Materials for Electromagnetic Flowmeters

Performance

Electromagnetic flow meters typically use Faraday's electromagnetic induction principle to measure the flow rate of fluids, so it is required that the electrode materials have good conductivity, corrosion resistance, and wear resistance. Choosing different electrode materials can be suitable for different application scenarios and fluid materials. At the same time, in order to protect the electrodes and sensors, lining materials are often used. The selection of lining materials mainly considers the corrosion resistance, wear resistance, and temperature of the medium. Correctly selecting electrode and lining materials can better meet the needs of fluid measurement and extend the service life of electromagnetic flowmeters.

A worker is polishing the lining material of an electromagnetic flow meter

Selection of Electrode Materials

Table 1: Selection Table for Electrode Materials of Electromagnetic Flowmeters
Material	Corrosion Resistance
316L	Applicable to: Domestic water, industrial water, raw water well water, urban sewage Weakly corrosive acids, alkalis, and salt solutions
Hastelloy B	Applicable to: Hydrochloric acid (concentration less than 10%), all concentrations of ammonium hydroxide alkaline solutions Sodium chlorate (concentration less than 50%) Phosphoric acid, organic acid Not applicable: nitric acid
Hastelloy C	Applicable to: Mixed acid such as chromic acid and sulfuric acid Oxidizing salts such as Fe++, Cu++, seawater Not applicable: hydrochloric acid
Titanium	Applicable to: Salts, such as (1) chlorides (chloride/magnesium aluminum/calcium/ammonium/titanium, etc.) (2) sodium salts, potassium salts, ammonium salts, hypochlorite salts, seawater Potassium chloride, potassium chlorate, silver chloride carbon solution with a concentration less than 50% Not applicable: hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, barium cyanide alkaline solution
Tantalum	Applicable to: Hydrochloric acid (concentration less than 40%), dilute sulfuric acid, and concentrated sulfuric acid (excluding fuming sulfuric acid) Chlorine dioxide, magnesium chloride, hypofluorous acid, sodium cyanide, lead acetate, etc. Oxidizing acids such as nitric acid (including fuming nitric acid) and aqua regia with a temperature below 80°C Not applicable: alkali/hydrofluoric acid
Platinum	Applicable: almost all acid, alkali, and salt solutions (including fuming sulfuric acid and fuming nitric acid) Not applicable: aqua regia, ammonium salts

Selection of Lining Materials

The selection of lining materials should be based on the corrosiveness, abrasiveness, and temperature of the measured medium.

Table 2: Selection Table for Lining Materials of Electromagnetic Flow Meters
Lining Materials	Name	Symbol	Performance	Maximum Operating Temperature	Liquid Used	Applicable Diameter
Rubber	Chloroprene Rubber	CR	Moderate wear resistance, resistant to corrosion from low concentrations of acids, alkalis, and salts	80 °C	Tap water, industrial water, seawater	DN50 – DN2200
	Polyurethane Rubber	PU	Excellent wear resistance, poor acid and alkali resistance	60 °C	Pulp, mineral slurry, and other slurries	DN25 – DN500
	Food-grade rubber	VULKODURIT	Excellent wear resistance and stable chemical properties	100 °C	Wine, beverages, and other edible liquids	DN40 – DN1000
Fluoroplastics	Polytetrafluoroethylene	F4 or PTFE	Chemically stable, resistant to boiling hydrochloric acid, sulfuric acid, aqua regia, and concentrated alkalis	180 °C	Corrosive acidic and alkaline salt liquids	DN25 – DN1200
	Polytetrafluoroethylene, also known as Teflon FEP	F46 or FEP	Slightly inferior chemical properties compared to F4	120 °C	Corrosive acidic and alkaline salt liquids	DN15 – DN500
	Soluble polytetrafluoroethylene	PFA	Similar chemical properties to PTFE, good resistance to negative pressure	200 °C	Strongly corrosive media such as concentrated acids and alkalis	DN10 – DN500

The above information provides details on the applicable media and operating temperatures for electrode and lining materials in electromagnetic flowmeters. You can choose the appropriate electrode and lining materials based on your fluid characteristics and operating environment. If you encounter any problems during the selection process, you can contact us, and we will do our best to assist you.