LDE PTFE lined magnetic inductive flowmeter parameters

Project Overview

1. Product Principle

The rubber-lined magnetic inductive flowmeter is a flowmeter that measures flow based on Faraday's law of electromagnetic induction. It is a flow instrument product that integrates intelligence, small size, lightweight, multi-function, high precision and high reliability. While satisfying on-site display, it can also output 4~20mA current signals for recording, adjustment and control. Magnetic inductive flowmeter is an inductive instrument that measures the volume flow of conductive media. In addition to measuring the volume flow of general conductive liquids, it can also be used to measure the volume flow of highly corrosive liquids such as strong acids and alkalis, and uniform liquid-solid two-phase suspension liquids such as mud, pulp, and paper pulp, as shown in Figure 1.

2. Performance characteristics

1. Strong anti-interference ability, almost immune to external interference

2. Measurement is not affected by fluid density, viscosity, temperature and pressure and the influence of changes in conductivity

3. There are no flow-blocking parts in the measuring tube, no pressure loss, and low requirements for straight pipe sections.

4. There are no moving parts and flow-blocking parts in the pipeline, and there is almost no negative pressure loss during measurement

5. It has self-check and self-diagnosis functions

6. The measuring range can be modified online according to the actual needs of the user on site

3. Meter function

1. LCD backlight display

2. Instantaneous flow, cumulative flow The meter and display flow percentage are shown in Figure 2

3. One-click query of net cumulative value, positive cumulative value, negative cumulative value, and current conductivity equivalent value

4. Multiple units switchable (L, m³, Kg, t/s, min, h)

5. 485 communication remote transmission to read data

IV. Lining selection

The main properties of the lining material are the maximum medium temperature applicable range

Integrated separated type

Polytetrafluoroethylene (F4) is a plastic with very stable chemical properties and can withstand boiling Hydrochloric acid, sulfuric acid, nitric acid and aqua regia, and can also withstand concentrated alkali and various organic solvents. Not resistant to corrosion by chlorine trifluoride, high-temperature chlorine trifluoride, high-flow liquid fluorine, liquid oxygen, and auto-oxidation. 70℃100℃ 250℃

(Special order required) 1. Strongly corrosive media such as concentrated acid and alkali.

2. Sanitary media.

Polyfluoroethylene-propylene (F46) is the same as F4, but its wear resistance and negative pressure resistance are higher than F4. Same as above

The applicable temperature limit of polyfluoroethylene (Fs) is lower than that of polytetrafluoroethylene, but the cost is also lower. 80℃

Polychloroprene 1. It has excellent elasticity, high tearing force and good wear resistance.

2. Resistant to the corrosion of general low-concentration acid, alkali and salt media, but not resistant to the corrosion of oxidizing media. 80℃ 120℃

(Special order required) Water, sewage, weakly abrasive mud or slurry.

Polyurethane rubber 1. Extremely wear-resistant. 80℃ neutral and strong abrasion ore slurry, coal slurry, mud

2, poor corrosion resistance.

5. Electrode selection

Corrosion resistance and wear resistance of electrode materials

Stainless steel is used in weakly corrosive media such as industrial water, domestic water, and sewage. It is suitable for industrial sectors such as petroleum, chemicals, and steel, as well as municipal and environmental protection. and other fields.

Hastelloy B has good corrosion resistance to hydrochloric acid of all concentrations below the boiling point, and is also resistant to non-chlorinating acids and bases such as sulfuric acid, phosphoric acid, hydrofluoric acid, and organic acids, and is non-oxidizing. Salt corrosion.

Hastelloy C is resistant to corrosion by non-oxidizing acids, such as nitric acid, mixed acid, or mixed media of chromic acid and sulfuric acid, and is also resistant to oxidizing salts such as Fc+, Cu+ or those containing other oxidants. Corrosion, such as corrosion from hypochlorite solutions higher than normal temperature and seawater

Titanium can withstand seawater, various chlorides and hypochlorites, oxidizing acids (including fuming sulfuric acid), organic acids, Alkaline corrosion. It is not resistant to corrosion by relatively pure reducing acids (such as sulfuric acid, hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fc+, Cu+), the corrosion is greatly reduced.

Tantalum has excellent corrosion resistance similar to glass. In addition to hydrofluoric acid, fuming sulfuric acid, and alkali, it is almost resistant to corrosion by chemical media (including boiling hydrochloric acid, nitric acid, and sulfuric acid below 50°C). Resistant to alkali; resistant to corrosion.

Platinum/titanium alloys are resistant to almost all chemical media, but are not suitable for aqua regia and ammonium salts.

Stainless steel coated with tungsten carbide for use in non-corrosive, highly abrasive media.

Note: Since there are many types of media and their corrosiveness changes due to complex factors such as temperature, concentration, flow rate, etc., this table is for reference only. Users should make their own choices based on the actual situation. If necessary, they should conduct corrosion resistance tests on the selected materials, such as coupon tests.