Split type electromagnetic flowmeter

1、 Product Overview:

The LDE series split type electromagnetic flowmeter is an induction instrument that measures the volume flow rate of conductive medium inside a tube based on Faraday's law of electromagnetic induction. It adopts a split type design, which is convenient for maintenance and increases the service life of the electromagnetic flowmeter. Wall mounted flow converter effectively protects the sensor conversion circuit and is beneficial for corrosion prevention, moisture resistance, and waterproofing. The product has simple wiring and easy installation. Split electromagnetic consists of sensors and converters. The sensors are installed on the measuring pipeline, while the converters are installed within 30 or 100 meters of the sensors. The two are connected by shielded cables to measure the volumetric flow rate of conductive liquids. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core, and magnetic yoke housing. Mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines.

2、 Working principle:

The LDE series split type electromagnetic flowmeter is based on Faraday's electromagnetic induction principle. A pair of detection electrodes are installed on the pipe wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by the two detection electrodes, and the value is proportional to the flow rate. Its value is: E=KBVD formula:

E - Induced potential;

K - coefficient related to magnetic field distribution and axial length;

B - Magnetic induction intensity;

V - average flow velocity of conductive liquid;

D - electrode spacing; (Measuring the inner diameter of the tube)

The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After amplification, transformation, filtering, and a series of digital processing, the instantaneous and cumulative flow rates are displayed on a backlit dot matrix LCD. The converter has 4-20mA output, alarm output and frequency output, and is equipped with communication interfaces such as RS-485, and supports HART and MODBUS protocols.

3、 Application scenarios:

The LDE series split type electromagnetic flowmeter is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines. Such as water, sewage, mud, pulp, various acids, alkalis, salt solutions, food slurries, etc., are widely used in industries such as petroleum, chemical, metallurgical, textile, food, pharmaceuticals, papermaking, as well as in municipal management, water conservancy construction, and other fields to measure high temperature, high humidity, and difficult to observe environments.

4、 Structural form:

1. Sensor:

The sensor mainly consists of a measuring conduit, measuring electrodes, excitation coils, iron cores, magnetic yokes, and a housing.

a、 Measurement catheter: composed of stainless steel catheter, lining, and connecting flange, it is a carrier for measuring the on-site working conditions of the measured liquid.

b、 Measurement electrode: a pair of electrodes installed on the inner wall of the measurement catheter, perpendicular to the axial flow direction, to generate signals for the measured liquid.

c、 Excitation coil: The upper and lower excitation coils that generate a magnetic field inside the measuring conduit.

d、 Iron core and magnetic yoke: Introduce the magnetic field generated by the excitation coil into the liquid and form a magnetic circuit.

e、 Shell: Instrument outer packaging.

2. Converter: It is an intelligent secondary meter that amplifies and processes flow signals. After being operated by a microcontroller, it can display flow and cumulative measurement, and output signals such as pulses and analog currents for measuring or controlling fluid flow.

3. Product assembly form: It is divided into two forms: integrated and split.

a、 Integrated: The sensor and converter are installed together.

b、 Split type: Sensors and converters are installed separately, forming a flow metering system through connecting cables.

c、 To meet the requirements of measuring different media, there are multiple choices for the lining and electrode materials of sensors.

5、 Main features:

1. The measurement of flow rate is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy.

2. There is no obstruction in the measuring pipeline, so there is no additional pressure loss; There are no movable parts inside the measuring pipeline, so the sensor has an extremely long lifespan.

3. Due to the fact that the induced voltage signal is formed in the entire space filled with a magnetic field and is the average value on the surface of the pipeline, the sensor requires a shorter straight pipe section, with a length of 5 times the diameter of the pipeline.

4. The sensor part only has the inner lining and electrodes in contact with the measured liquid. As long as the electrode and inner lining materials are selected reasonably, they can be corrosion-resistant and wear-resistant.

5. The LD converter adopts international xj * * * microcontroller (MCU) and surface mount technology (SMT), with reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting. Click on the Chinese display LCD to show accumulated flow, instantaneous flow, flow rate, flow percentage, etc.

6. Measurement system, capable of measuring forward flow and reverse flow. Using special production processes and superior materials to ensure stable product performance over a long period of time.

7. Suitable for measuring the volumetric flow rate of conductive liquids and slurries in closed pipelines, such as clean water, sewage, various acid-base salt solutions, mud, slurry, pulp, and liquids related to food.

6、 Technical parameters:

1. Instrument accuracy: pipeline type 0.5 level, 1.0 level; Insertion type 2.5 level.

2. Measurement medium: various liquid and liquid-solid two-phase fluids with conductivity greater than 5 μ S/cm.

3. Flow velocity range: 0.2-8m/s.

4. Work pressure: 1.6MPa.

5. Environmental temperature:- 40 ℃ to+50 ℃.

6. Medium temperature: PTFE lining ≤ 180 ℃; Rubber material 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。

Detached type: Sensor IP68 (5 meters underwater, limited to rubber lining) Converter IP65.

11. Output signal: 4-20mA DC， The load resistance ranges from 0 to 750 Ω.

12. Communication output: RS485 or CAN bus.

13. Electrical connection: M20 × 1.5 internal thread, φ 10 cable hole.

14. Power supply voltage: 90-220V AC, 24 ± 10% V.DC.

15. Maximum power consumption: ≤ 10VA.