Sanitary electromagnetic flowmeter

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The sanitary electromagnetic flowmeter is excited by constant current low-frequency three-valued rec…

I. product overview
Zw-lde /W series sanitary electromagnetic flowmeter adopts MCU embedded technology to realize digital excitation, and CAN fieldbus is adopted on electromagnetic flowmeter, which belongs to domestic *, and the technology reaches the advanced level in China. Is a high performance, reliable flowmeter, it USES a new generation of special high-quality sanitary lining materials and easy to clean the connection mode, widely used in food, medicine and brewing and other health requirements of higher industry flow measurement.
Ii. Working principle
The principle of zw-lde /W series sanitary electromagnetic flowmeters is based on Faraday's law of electromagnetic induction. A pair of detection electrodes are installed on the tube wall perpendicular to the measuring tube axis and magnetic force line. When the conductive liquid moves along the measuring tube axis, the conductive liquid cuts the magnetic force line to generate an induction potential, which is detected by two detection electrodes. The value is directly proportional to the flow.
E- induction potential;
K- coefficient related to magnetic field distribution and axial length;
B- magnetic induction intensity;
V- average velocity of conductive liquid;
D- electrode spacing; (measuring pipe diameter)
The sensor takes the induced potential E as the flow signal and transmits it to the converter. After amplification, transformation and filtering, the sensor USES a series of digital processing to display the instantaneous flow and cumulative flow with a backlit point-matrix liquid crystal display. Converter has 4 ~ 20mA output, alarm output and frequency output, and rs-485 communication interface, and support HART and MODBUS protocol.

Iii. Application:
ZW - LDE/W series health type electromagnetic flowmeter in food, medicine and other health industry, the process often need to use the high temperature steam cleaning and disinfection, and pipe joint position, including flow meter sensor, there can be no traces of medium, in order to prevent the bacteria multiply, so the health industry pipe connected to the meter generally adopted quick joint form, namely the clamp type structure. Can be widely used in mineral water, soy sauce, jam, beer, fruit juice, rice wine, milk and other food production process and health, chemical and other fields.

Iv. Structure:
1. Sensor:
The sensor is mainly composed of a measuring conduit, a measuring electrode, an exciting coil, an iron core, a magnetic yoke and a housing.
A. Measuring catheter: it is composed of stainless steel catheter, lining and connecting flange, and it is the carrier for field working condition measurement of the measured liquid.
B. Measuring electrode: a pair of electrodes mounted on the inner wall of the measuring catheter perpendicular to the axial flow direction to generate signals from the measuring liquid.
C. Field coils: the upper and lower field coils that generate the magnetic field in the measuring tube.
D. Iron core and magnetic yoke: conduct the magnetic field generated by the excitation coil into the liquid and form a magnetic circuit.
E. Housing: outer packing of instrument.
2. Converter:
It is an intelligent secondary meter, which can display the flow and accumulative amount after amplifying the flow signal and processing the single-chip computer calculation, and can output pulse, analog current and other signals for the measurement or control of fluid flow.
3. Product assembly:
It is divided into two forms: one body type and two body types.
A. Type I: integrated installation of sensors and converters.
B. Fracturing: the sensor and converter are separated and installed, and the flow metering system is formed by connecting cables.

V. main features:
1. New sanitary lining material is adopted to prevent the accumulation of measurement medium residues in the measurement tube.
2. The measuring pipe has no obstructing moving parts, no pressure loss and low requirements for straight pipe section.
3. The sensor adopts the new generation of special high-quality lining technology, and USES the special mirror polishing PFA lining.
4. The intelligent converter can display measurement data such as volume flow percentage, instantaneous flow and cumulative flow at the same time.
5. Adopt the quick connection scheme, the electromagnetic flow meter is convenient for disassembly, maintenance and cleaning. The intelligent converter adopts LCD backlight LED display, which can read clearly even in strong light or at night.
6. The parameters can be set through the infrared touch button, and the cover plate of the converter can be set safely without opening in the harsh environment.
7. The converter has the functions of self-diagnosis alarm, empty load detection alarm, flow upper and lower limit alarm and flow value alarm output at both poles.
8. 16-bit embedded microprocessor is adopted for signal processing, featuring high integration, fast operation speed, high calculation accuracy, full digital signal processing, strong anti-interference ability and reliable measurement.
9, high definition backlight LCD display, full Chinese menu operation, easy to use, simple operation, easy to learn and easy to understand.
10 with RS485, RS232, Hart and Modbus digital communication signal output.
Vi. Technical parameters
1 nominal diameter: dn10-dn300mm;
Accuracy: 0.5% of the indicated value, 0.3% or 0.2% of the optional indicated value;
3: medium temperature points size - 10 ℃ ~ + 180 ℃; A body - 10 ℃ ~ + 80 ℃;
4: ambient temperature 25 ℃ ~ + 60 ℃;
5 medium conductivity: greater than 20 s/cm;

6 lining: PTFA;
Electrode materials: molybdenum stainless steel, hastelloy B, hastelloy C, titanium, tantalum, platinum, iridium alloy;
8 electrode form: three electrode structure, two electrode structure, removable electrode structure;
Installation: type I, type ii;
10 shell protection class: sensor IP65,IP68 optional (IP65: dust tight, waterproof,IP68: dust tight, can work under water for a long time.) Converter IP67 (IP67: dust tight, short time immersion);
Explosion-proof mark: the explosion-proof grade of explosion-proof sensor is ExmdIIBT4.
Vii. Advantages of flow meter
1. The coil, an important part of the sensor, is optimized for the zui design, and the measurement accuracy of the product is ensured through the zui rigorous field test.
2. The signal electrode is completely shielded by electrostatic shielding to ensure that small signals will not be interfered by coils and to ensure the measurement accuracy of low velocity.
3. The coil is isolated from the outside world to ensure the long-term insulation strength of the coil and the long-term measurement accuracy of the sensor.
All welders of the sensor adopt the argon arc welding process, which can ensure the reliability of welding (welding is the main production process of zui of the sensor) despite the high cost. In particular, the welding process after the installation of the zui coil can ensure that the installed coil is not damaged by the argon arc welding process.
5. The grounding electrode structure is adopted to form a balanced electrode plane to ensure that the whole process of measuring the average speed is limited to the balanced electrode plane, which can well eliminate electrical noise interference and provide accurate measurement results.
6. Customized double-layer shielding cable is adopted.
7, programmable frequency rectangular wave excitation, improve the stability of flow measurement, low power loss.
8. Special medium measurement (such as slurry) adopts high-frequency excitation to eliminate clutter interference.
9. 16-bit embedded microprocessor is adopted for fast operation and high precision.
10. All-digital processing, strong anti-interference ability, reliable measurement and high precision.
11. Ultra-low EMI switching power supply, suitable for power supply with wide voltage variation range and good EMC resistance.
12, complete all functional design with a single circuit board, using SMD devices and SMT (surface mount) technology, high circuit reliability.
13, high definition backlight Chinese LCD display, display cumulative flow, instantaneous flow, flow rate, flow percentage, etc.
14, menu operation, easy to use, simple operation, easy to learn and easy to understand.
15, with self-test and self-diagnosis function, and display on the screen.
16. Unique lightning protection design.

Viii. Product classification and technical description

Intelligent sanitary electromagnetic flowmeter: clamping type, thread type, clamp type three.

1, clamping type health

Main technical indicators: