Split type electromagnetic flowmeter
I. Product Overview:
LDE series split type electromagnetic flowmeter is an induction meter which measures the volume flow of conductive medium in the tube according to Faraday's law of electromagnetic induction. It adopts split type design, which is convenient for maintenance and increases the service life of electromagnetic flowmeter. Wall mounted flow converter, effective protection sensor conversion circuit, is conducive to corrosion, moisture, waterproof. The wiring is simple and installation is convenient. The split electromagnetic consists of a sensor mounted on a measuring pipe and a converter mounted within 30 meters or 100 meters from the sensor connected by a shielded cable to measure the volume flow of a conducting liquid. The main components of the sensor are measuring tube, electrode, excitation coil, iron core and magnetic yoke shell. It is mainly used to measure the volume flow of conductive liquid and grout in closed pipes.
Ii. Working principle:
LDE series split type electromagnetic flowmeter based on Faraday electromagnetic induction principle, with the measuring pipe axis and the magnetic field lines in the vertical tube wall installed on a pair of detecting electrodes, when conducting liquid along the measuring tube axis movement, conductive liquid cutting lines of magnetic force induced electric potential, the induction electric potential by two detection electrodes detection, numerical size and flow into a direct ratio, its value is: E = KBVD type:
K- coefficient related to magnetic field distribution and axial length;
B- magnetic induction intensity;
V- Average velocity of conductive liquid;
D- electrode spacing; (Measure tube diameter)
The sensor sends the induced potential E as a flow signal to the converter, which is amplified, transformed and filtered by a series of digital processing, and displays the instantaneous flow and cumulative flow with a backlit dot matrix LIQUID crystal. The converter has 4~20mA output, alarm output and frequency output, and has rS-485 communication interface, and support HART and MODBUS protocol.
LDE series split electromagnetic flowmeters are mainly used to measure the volume flow of conductive liquid and slurry in closed pipes. Such as water, sewage, mud, pulp, all kinds of acid, alkali, salt solution, food slurry, widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as, municipal management, water conservancy construction and other fields measurement of high temperature, high humidity, inconvenient to observe the environment.
Iv. Structural form:
The sensor is mainly composed of measuring tube, measuring electrode, excitation coil, iron core, magnetic yoke and shell.
A. Measuring catheter: it is composed of stainless steel catheter, lining and connecting flange, and is the carrier for the field measurement of the liquid under test.
B. Measuring electrode: a pair of electrodes installed on the inner wall of the measuring tube, perpendicular to the direction of axial flow, so that the measuring liquid can produce signals.
C. Excitation coil: the upper and lower excitation coils that generate magnetic field in the measuring catheter.
D. Iron core and magnetic yoke: lead the magnetic field generated by the excitation coil into the liquid and form a magnetic loop.
E. Case: instrument outer packaging.
2, converter: that is, intelligent second table, which will flow signal amplification processing, MCU operation, can display the flow, cumulative amount, and can output pulse, analog current and other signals, for the measurement or control of fluid flow.
3, product assembly form: it is divided into two forms of body type and body type.
A, one type: sensor and converter integrated installation.
B. Divider: the sensor and converter are separated and installed, and the flow metering system is formed by connecting the cable.
C, in order to adapt to the requirements of different media measurement, sensor lining and electrode materials can be a variety of choices.
Five, main features:
1, flow measurement is not affected by fluid density, viscosity, temperature, pressure and conductivity changes, sensor induced voltage signal and the average flow rate is linear, so the measurement accuracy is high.
2. Measure open flow parts in the pipeline, so there is no additional pressure loss; The sensor has a long life because there are no moving parts in the pipeline.
3. Because the induced voltage signal is formed in the whole space filled with magnetic field and is the average value of the load surface of the pipe, the straight pipe section required by the sensor is shorter, with a length of 5 times the pipe diameter.
4, the sensor part only the lining and electrode contact with the measured liquid, as long as the reasonable choice of electrode and lining material, can be resistant to corrosion and wear.
5, LD converter adopts international advanced MCU and surface mount technology (SMT), reliable performance, high precision, low power consumption, stable zero point, convenient parameter setting. Click the Chinese LCD to display the cumulative flow, instantaneous flow, flow rate, flow percentage, etc.
6, measuring system, can measure forward flow, reverse flow. Special production technology and better materials are adopted to ensure that the product performance remains stable for a long time.
7, suitable for measuring the volume flow of conductive liquid and slurry in closed pipes, such as clean water, sewage, various acid, alkali and salt solutions, mud, pulp, pulp and food liquids.
Vi. Technical Parameters:
1, instrument accuracy: pipe type 0.5, 1.0; Plug-in level 2.5.
2. Measurement medium: all kinds of liquid and liquid-solid two-phase fluid with conductivity greater than 5μS/cm.
3, flow rate range: 0.2 ~ 8m/s.
4. Working pressure: 1.6mpa.
5, ambient temperature: -40℃ ~ +50℃.
6, medium temperature: POLYtetrafluoroethylene lining ≤180℃; Rubber lining ≤65℃.
7, explosion-proof mark: Exmibd ⅱ BT4.
8. Explosion-proof certificate Number: GYB01349.
9, external magnetic interference: ≤400A/m.
10, shell protection: integrated type: IP65.
Separation type: Sensor IP68 (5 m underwater, rubber lining only) converter IP65.
11, output signal: 4 ~ 20mA.DC, load resistance 0 ~ 750 ω.
12, communication output: RS485 or CAN bus.
13, electrical connection: M20×1.5 internal thread, φ10 cable hole.
14, power supply voltage: 90 ~ 220V.AC, 24±10%V.DC.
15, maximum power consumption: ≤10VA.