Flange Connected Turbine Flow Meter Sensor China
Electromagnetic flow meters, or magmeters, are comprised of a
transmitter and sensor that together measure flow. The magnetic
flow meter’s sensor is placed inline and measures an induced
voltage generated by the fluid as it flows through a pipe. The
transmitter takes the voltage generated by the sensor, converts the
voltage into a flow measurement and transmits that flow measurement
to a control system.
A magmeter utilizes a set of coils and a pair of electrodes for
flow measurement. The meter’s coils are driven by the transmitter
with an applied current. Once powered, a magnetic field is formed
between both coils. When the pipe is full and the fluid begins to
flow, the force of the magnetic field causes the negatively and
positively charged particles of the fluid to separate as they pass
through the magnetic field. This separation causes an induced
voltage between the electrodes and sensor.
Features
1.No moving and blocked flow parts in the pipeline, almost no
additional pressure loss in the measurement.
2.Measurements results are independent of physical parameters, such
as flow distribution, fluid pressure, temperature, density and
viscosity.
3.On-site modification of the measuring range available.
4.LCD display, easy to use and simple to operate.
5.Using SMD devices and SMT technology.
6.Using 16-bit embedded processors with fast speed and high
accuracy, enhancing the stability of measurement.
7.Anti-interference, reliability, measurement range up to 150:1.
8.Ultra low EMI switch, wide range of power supply voltage.
9.RS485, RS232, Hart and Modbus digital communication signal
output.
10.Self-checking function.
Working Principle
Working principle of electromagnetic flow meter measurement is
based on the Faraday law of electromagnetic induction. Measurements
of the flow meter tube is lined with insulating material of a
non-magnetic alloy spool. Two clicks along the diameter
through-wall fixing on the measuring tube. The electrode head is
flush with the lining inner surface. Field coil by waves when
pulsed excitation by both parties, will be measured perpendicular
to the pipe axis direction produces a magnetic flux density of the
magnetic field b. At this point, if you have
some electrical conductivity of fluid flows through the measuring
tube, cut magnetic lines of induction electromotive force e.
Electromotive force e is proportional to the magnetic flux density
B, measure the inside diameter d and the product of the mean
velocity v. Electromotive force e (traffic signal) checked out by
electrodes and cables to the converter. Converter after the traffic
signal will be amplified, to display fluid flow and energy output
pulse, analog current signals for flow control and the flow
adjustment.
E=KBdv Type: E-for signal voltage between the electrodes (v)
B--magnetic flux density (t)
d--measuring tube diameter (m)
v--average flow velocity (m/s)
K, d is a constant, due to magnetizing current is constant, b is
constant, the E=KBdv, is proportional to the
signal voltage and volumetric flow Q E-. And volume flow rate
sensor signal voltage e Q into a linear relationship. Therefore, as
long as the measure to determine the flow rate Q, this is the basic
operating principle of electromagnetic flowmeter. By E=KBdv today,
the measured flow of medium temperature, density, pressure,
conductivity, liquid-solid two phase media of liquid and solid
ingredients than parameter does not affect the measurement results.
As for the axisymmetric flow flow state as long as it meets (such
as laminar or eddying flow) does not affect the measurement
results. Thus volume flowmeter Electromagnetic Flowmeter is a real.
For manufacturers and users alike, just use plain water after the
actual calibration of measuring volume flow of the fluid any other
to the point, without the need for human and remediation. This is
electromagnetic flowmeter to highlight advantages, is not found in
any other flow meters. Measuring tube and block parts of
inactivity. So there is little pressure loss and extremely high
reliability.
Product Parameters
| Product Name | Electromagnetic Flowmeter |
| Repeatability error | +/-0.1% |
| Accuracy class | 0.5 class, 1.0 class |
| Measured medium temperature | Common rubber lining: -20~+60 ° c |
| High temperature rubber lining: -20~+90 ° c |
| PTFE lining: -30~+100 ° c |
| High temperature vinyl lining: -30~+180 ° c |
| Rated working pressure | pipeline: DN10~DN65: ≤ 2.5MPa;DN80~DN150: ≤ 1.6MPa;
DN200~DN1200: ≤ 1.0MPa |
| Flow rate range | 0.3~15m/s |
| Measured fluid conductivity | ≥5μs/cm liquid |
| Output | 4~20mA / 4~20mA + Hart |
| Electrode material | 316L, titanium (Ti), tantalum (Ta), Hastelloy (H),
Platinum (Pt) or other special electrode materials |
| Working power supply | 85~265VAC / 24VDC / Battery |
| Straight pipe length | pipe: ≥ 5DN in the upper reaches, downstream
of greater than or equal to 2DN |
| Connections | Flange |
| Protection grade | standard: IP65; IP68(optional) |
| Explosion-proof mark | mdllBT4 |
Deatail Images
Installation suggestion
1.To avoid magnetic field environment, and magnetic device, in case
that it affects magnetic and signal output.
2. Dry and ventilated place for installation.
3.Avoid the sun and rain, and high temperature above 60℃ and
humidity above 95%
4.Place that easy for installation and moving
5.Flowmeter should be installed behind pump, and valve must be
connected with outflow part of flowmeter.
Installation requirement
1.Transmitter can be installed on the straight pipe and horizontal
pipe
2.full pipe flow to avoid the electrode touching with air.
3.Vertical installation to abrade lining equally to prolong the
lifetime, if the medium is mixture of liquid and water.
4.Change installation methods: choose smaller diameter flowmeter if
the flow rate doesn't reach the requirement. Change Some part pipe
to make diameter same as transmitter's, but straight pipe must be:
inflow part≧ 5DN, outflow part≧2DN(DN pipe diameter)
