Technical Center

Magnetic Flow meter liner & Electrodes Selection

Hot:40952013-08-27 00:53:54 From: FTD Automation Instruments

 

When Choosing Magnetic Flow meter, the liners & electrodes are very important. They are selected according to the fluids & the working conditions.

Different medium, temperature will result in different selection of electromagnetic flow meters.

Following charts are for your reference when you choose different the magnetic flowmeter liners & electrodes.

. Selection of Liner

Material of Liner

Main Functions

Max Fluid Temp.

Application

Integral

Remote

Teflon

(PTFE)

1. Most steady plastic of chemical living

energy; resist boiling hydrochloric acid, sulfuric acid, nitric acid, nitro- hydrochloric acid, thick alkali and all kinds of organic solvent; not resist chlorine trifluoride, chlorine trifluoride of high temperature, liquid fluorine of high rate, liquid fluorine, corrosion of ozone

2. Performance of resisting abrasion not

as good as polyurethane rubber

3. Capability of resisting sub atmospheric pressure not as good as polychlorobutadiene rubber

100°C

120

150C°C (require special order)

1. Thick acid, alkali, etc. with strong corrosion

2. Sanitary mediums

3. Industrial Waste water

Fluorinated Ethylene Propylene (FEP)

Same above

Fs

Upper limit of suitable temperature lower than teflon, as well as cost

70°C

80°C

Polychlorobutadiene rubber

1.Excellent elasticity, high strength of pulling apart, good performance of resisting abrasion

2.Resist corrosion of generally low- density acid, alkali and salt; not resist corrosion of oxidized matters

80°C

120°C

(require special order)

Water, sewage, mud and pulp with weak abrasion

Polyurethane rubber

1.Strong performance of resisting abrasion

2. Poor performance of resisting corrosion

80°C

Neutral pulp, coal and mud with strong abrasion

3. Selection of Materials of Electrodes of mag flow meter

Materials of electrodes

Performance of resisting erosion and abrasion

Stainless steel

0Cr18Ni12Mo2Ti

Apply to industrial water, domestic water, polluted water, etc. with weak erosion, applied in petroleum chemical industry, steel and iron,etc. and fields in government and environmental protection

Hastelloy B

Good performance of resisting erosion to hydrochloric acid of all degrees of density below the boiling point; resisting sulfuric acid, phosphoric acid, hydrofluoric acid, organic acid, etc. non- chlorine acid, alkali, erosion of non-oxidized salty fluid

Hastelloy C

Resisting non-oxidized acid, such as nitric acid, nitration mixture, or the erosion of the mixture of chromic acid and sulfuric acid; resisting oxidized salt such as Fe +++, Cu++ or the erosion of other oxidizers, such as the erosion of higher than normal temperature hypochlorite liquor and the sea water

Titanium

Resisting erosion of sea water, all kinds of chloride and hypochlorite, oxidized acids (including Fuming sulfuric acid), organic acid, alkali; not resisting the erosion of purer reducing acids( such as sulfuric acid, hydrochloric acid); if oxidizer exists in acids (such as nitric acid, Fe+++. Cu++) the erosion will reduce greatly.

Tantalum

Good performance of resisting erosion, similar to glass; Besides hydrofluoric acid, fuming nitric acid, alkali, nearly can resist erosion of all chemical mediums(including boiling hydrochloric acid, nitric acid and below 150°C sulfuric acid ). Not resisting erosion in alkali.

Pt/ Iridium Alloy

Can nearly resist all chemical matters, not fit for aqua regia and ammonium salt

Stainless Steel Painting

Tungsten Carbide

Fit for mediums without erosion and strong attrition

Remarks: Due to multiple types the erosion is subject to complex factors such as temperature, density, flow rate etc., this sheet is only for reference. Users should make decision according to practical conditions, if necessary make experiment of resisting erosion of to-be-chosen materials, such as the experiment of hanging pieces

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