Electromagnetic flowmeter is a kind of inductional instrument designed by Faraday’s law of electromagnetic induction to measure the flow of conductive media in the tube. It adopts the technology of insertion of a single chip to realize digital excitation and employs CAN local Fieldbus.
The electromagnetic flowmeter can realize local indication and output electrical current signal of 4-20mA which can be used to record, adjust, and control. Electromagnetic flow meters are widely used in industrial sectors such as the chemical industry, environmental protection, metallurgy, pharmaceutical, paper making, water supply, and removal, etc.
Besides measuring the flow of general conductive liquid electromagnetic flowmeter can measure the flow of liquid-solid mixed fluid, high-viscosity fluid and salt, strong acid, and strong alkali.
PERFORMANCES & FEATURES
- Simple structures, firm, no movable parts, and long operation life
- No intercepting fluid parts, no pressure loss, and fluid clogging
- No mechanical inertia, quick response, and good stability apply in the automatic examination, adjustment, and control
- Measuring accuracy not influenced by physical parameters such as style, temperature, viscosity, density, and pressure.
- Employ Teflon or rubber liner and different combination of electrode material such as Hastelloy C,Hastelloy B, 316L,
- Titanium and adapt the need of different mediums.
- Supply many styles of flowmeters such as inline type and insertion type, etc.
- Adopt EEPROM memory to measure operation data, safe and reliable protection of memory.
- Integral type flowmeters and remote type flowmeters.
- LCD backlight display with high clearness
Flow velocity range during measurement
When measuring a clean medium, the economical flow velocity is 1.5~3m/s. When measuring a crystalloid solution, should increase flow velocity properly to 3~4m/s, which can self-clean, avoid adhesion and deposition, etc. When measuring abrasive fluid such as ore pulp, should reduce flow velocity properly to 1.0~2m/s in order to reduce abrasion on the liner and electrode. Over 7m/s is very few in practical application, and more than 10m/s is even rare.
Selection of Liner
Sheet 3
| Material of Liner |
Main Functions |
Max Fluid Temp. |
Application
|
| Integral |
Remote |
|
Teflon
(PTFE) or F4
|
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 (require special order) |
1. Thick acid, alkali, etc. with strong corrosion
2. Sanitary mediums
3. Industrial Waste water |
| Fluorinated Ethylene Propylene (FEP) Or F46 |
|
Same above |
|
| Fs |
Upper limit of suitable temperature lower than teflon, as well as cost |
70 C |
80C |
|
|
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 |
80C
120C
(require special order) |
Water, sewage, mud and pulp with weak abrasion |
| Polyurethane rubber (PU) |
1.Strong performance of resisting abrasion
2. Poor performance of resisting corrosion |
80C |
Neutral pulp, coal and mud with strong abrasion |
| Copolymer of tetrafluoroethylene and perfluoroalkylvinyl ether (PFA) |
Chemical feature equal to F46 , Resistance to tensile property better than F46 |
<180 C |
|
Corrosive liquid of acid ,alkali,salt |
