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Electromagnetic Flowmeter (LD series) |
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Measuring principle |
Based on Faraday's law of electromagnetic induction, when the conductive liquid flow through electromagnetic flowmeter, the liquid in the conductor will have an average velocity V (volume of traffic) that is directly proportional to the voltage, the voltage sensor signals go by the electrodes detect that contacted with liquid, and cable and Spread to amplifier, converted into a unified output signal. Based on the electromagnetic flowmeter measurement principle, the flowing liquid should be with a minimum conductivity. |
V=KBDV
K: The constant of proportionality
B: magnetic induction intensity
D: measuring the diameter
v: measuring the average velocity of Cao cross-section
5VOC(O-5VDC)
Signal v, after conversion, flow into a linear relationship with the frequency signal o-jae
5VOC (O-5VDC) for after-meter plot count or control.
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Features |
Three rectangular wave of low-frequency constant current excitation from the scene of various spurious frequency interference and the impact of stable and reliable use of non-uniform magnetic field of new technologies and a special magnetic circuit structure, stable and reliable magnetic field, but also greatly reduce the volume, Reduce the weight so that the flow meter is small and lightweight.
With auto-zero air traffic control functions.
Modify range online according to usders' actual semand.
Measuring the unimpeded flow of the pieces, so no additional pressure loss.
Surveyresults is irrelevant with liquid pressure, temperature, density, viscosity, electrical conductivity (not less than the minimum conductivity), and other physical parameters. Direct control of the relative demand shorter.
Easy to use, without any other operation, just need to connect power after the installation, stardard output signal can be gotten, convenient for non-professionals. |
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Technical parameters |
Implementation of the standards: JB/T9248-2000
Electromagnetic Flowmeter lining and the public that Path DN (mm):
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Rubber lining40,50,65,80,100,125,150,200,250,300,350,400,450,500,600 |
PTFE lining10,15,20,25,32,40,50,65,80,100,125,150,200,250,300,350,400,450, |
| 500,600 |
Note: special specifications can be ordered |
Measurement error : 0.5% 1.0% |
Tested medium temperature : |
Rubber lining -20 桪 + 65 PTFE -20 桪 + 150 |
Ambient temperature : -25 + 45 |
Relative Humidity : 5%-95% |
Rated pressure : DN10-DN65:4.0Mpa DN80-DN150:1.6Mpa DN200-DN600:1.0Mpa |
Velocity of : 0.05-10m/s |
Conductivity: the measured fluid conductivity of not less than 20 s / cm |
Output signal and load resistance: 0-10mADC ,0-1000 4-20mADC ,0-500 |
Electrode materials: stainless steel with Mo (M02Ti), titanium (Ti), tantalum (Ta), Harrington alloy (HB), platinum (Pt) |
Protection levels: standard IP65, IP67, optional IP68 |
Straight length: the upper reaches of 5DN, downstream 2DN |
Link: pipe flange connection, in line with standards: GB9119-88 |
Power Supply: 220VAC 10%, 50HZ 5% power consumption: <25W |
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Lining the choice |
According to the measured temperature and the types of media, to select the lining material. Choice of lining the standard in table 1. |
Lining materials |
Main Performance |
Scope |
Neoprene |
Wear resistance, and has excellent flexibility, high Cheduan, and the general low concentration of acid-base resistant to salt corrosion media, intolerance of the medium corrosion. |
<60 , the general water, sewage, mud, pulp. |
Polyurethane |
Have excellent wear resistance, Naisuan Jian performance slightly worse. |
<80 , the wear-neutral pulp, coal slurry, mud. |
PTFE |
It is the most stable chemical properties of a material, the capability of boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, strong alkali and various organic solvents, chlorine trifluoride intolerance, high temperature of oxygen fluoride. |
<180 , strong acids, alkalis and other strong corrosive media, health media category. |
F46 |
Chemical stability, electric insulation, lubrication, not sticky and not Ranxing PTFE and similar, but the F46 material strength, anti-aging, low temperature performance and gentle toughness than PTFE. And metal bonding properties, and good wear resistance in PTFE, has good slitting-resistant properties. |
<180 hydrochloric acid, sulfuric acid, aqua regia and strong oxidant, health media category. |
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Central grounding electrode material of choice |
Electrode material of choice should be based on the measured medium corrosive, wear, selected by the user, the general media, available on the corrosion of the manual, selected electrode material; mixed acid and other components of the media, should be pegged to do experimental films. Reference Table 2, as follows: |
Material |
Corrosion resistance |
For example tested liquid |
OCr18Ni12Mo2Ti |
The temperature of less than 80 degrees Celsius in various acid-base solution with strong resistance to chloride (calcium chloride, ammonium chloride, potassium chloride, sodium chloride) sulfide, a corrosive lye |
Phosphoric acid, caustic soda |
316L |
Intolerance inorganic acids, organic acids, the chloride corrosion weak for non-corrosive and aggressive media |
Domestic and industrial water, sewage, pulp, mud, syrup |
HB |
Resistance boiling point all the concentration of hydrochloric acid, sulfuric acid, hydrofluoric acid, organic acids, and other non-oxidizing acid and alkali, non-chloride salt solution. |
Hydrochloride |
HC |
Tolerance of acid such as: nitric acid, chromic acid mixed with acid or sulfuric acid oxidation of the mixture and salt, water, and so on. |
Seawater |
(Ti) |
Ability of sea water, chlorine and various hypochlorite, oxidizing acid (including fuming nitric acid), organic acids, alkalis, such as corrosion, intolerant than the net reduction of acid (such as sulfuric acid, hydrochloric acid), corrosion, but if Acid containing oxidants (such as nitric acid and contain Fe, Cu-media) when corrosion greatly reduced. |
Chilled brine, water, ammonia hydrogen peroxide, acetic acid |
(Ta) |
With excellent corrosion resistance and glass are similar, in addition to hydrofluoric acid, concentrated sulphuric acid, almost all chemical medium capability (including the boiling point of hydrochloric acid, nitric acid and sulfuric acid below the 175 and aqua regia), corrosion, the base of intolerance Corrosion. |
Hydrochloric acid, aqua regia, phosphoric acid, sulfuric acid |
(Pt) |
Chemical applied to almost all the media corrosion, but does not apply to aqua regia and ammonium salt |
Concentrated sulphuric acid, hot alkaline solution |
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Electromagnetic Flowmeter Selection Code |
Specifications code |
Description |
Instrument type |
L |
Flow |
Principle |
D |
Electromagnetic |
Conversion Type |
B |
A body without a show |
E |
A body with show |
N |
Separation of non-show |
J |
Separation-band scene shows |
The code - |
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Example: 200 diameter pipeline on behalf of |
Electrode material |
M Molybdenum containing stainless steel 0Cr18Ni12Mo2Ti |
T Ti |
H C HC B HB |
D Ta |
P Pt |
Lining materials |
X |
Rubber |
P |
PO |
F |
PTFE PTFE |
Current output |
0 |
No current output |
1 |
4 20mA |
Standard pressure |
1 |
1.0MPa |
2 |
1.6MPa |
3 |
2.5MPa |
4 |
4.0MPa |
Temperature |
E |
C 20+60 |
M |
C 30+100 |
H |
C 30+150 |
Central Ground material |
0 |
No grounding ring |
1 |
Stainless steel |
2 |
Titanium |
3 |
Tantalum |
4 |
Harrington alloy C |
Maximum flow (range) |
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Example: 600 represents the maximum flow 600m3 / h |
Selection For example: LDB - 100MX11E0 - 150
Notes: electromagnetic flowmeter, one non-show, DN100 pipeline, stainless steel electrodes, rubber lining, 4 - 20mA output signal Far EasTone, at room temperature, atmospheric pressure, no grounding ring, the largest flow of 150 m3 / h
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