Thread linking electromagnetic flowmeter

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Thread linking electromagnetic flowmeter is adopted new technology.Using the constant current low-fr…

Products overview:

ZW - LDE/W seriesThreaded connections electromagnetic flowmeterAdopting the new technology.Using the constant current low-frequency rectangular wave three values or double frequency rectangular wave excitation, the advantages of both the rectangular wave magnetic field, and overcomes the drawback of sinusoidal magnetic field;Thread type electromagnetic flowmeter can also eliminate the power supply voltage fluctuation, power frequency and the excitation coil impedance changes caused by the error;And has excellent stability of zero point and is not affected by fluid noise interference.Which has the characteristics of high stability, high reliability.Measuring principle is based on Faraday's law of electromagnetic induction, electromagnetic flowmeter is composed of sensors and switches, sensors installed on the measuring pipe, the converter can be connected to the sensor combination together referred to as electromagnetic flowmeter, a size converter is installed within 100 meters of within 30 meters away from the sensor or occasions, by shielding cable connection between called separation type electromagnetic flowmeter.Sensor is the main component of: measuring tube, electrode, excitation coil, magnetic yoke iron core and shell.Is mainly used to measure volume flow of conducting liquid and slurry in the closed pipeline.

Second, the working principle:
ZW - LDE/W seriesThreaded connections electromagnetic flowmeterAccording to Faraday electromagnetic induction principle, with the sounding 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:
E - induction electric potential;
K - factor related to the magnetic field distribution and the axial length;
B - magnetic induction intensity;
V - conductive liquid average flow velocity;
D - electrode gap;(the measuring tube diameter)
Sensor will be induced potential E as traffic signal, sent to the converter, amplifying, transform filter with a series of digital processing, USES dot matrix LCD display with backlight instantaneous flow and cumulative flow.Converter has 4 ~ 20 ma output, alarm output and frequency output, and is equipped with RS - 485 communication interface, and supports HART and MODBUS protocol.
Applications:
ZW - LDE/W seriesThreaded connections electromagnetic flowmeter is adopting international advanced technology research and development of a kind of high intelligence, high reliability flowmeter tear open outfit is convenient, not only can be used in the process of general detection, also suitable for pulp, pulp and paste liquid measurement, widely used in petroleum, chemical, steel, food, electric power, papermaking, water conservancy, water supply and drainage, take water and other industries.
Four, the structure form:
1, the sensor:
Sensor is mainly composed of measuring tube and electrode, excitation coils, iron core, magnetic yoke and shell. 
A, measuring catheter: by stainless steel tube, the lining and the connecting flange, as the carrier of measured liquid measurement working conditions on site. 
B, measuring electrode: installed in the measuring tube inside wall, and the axial direction perpendicular to a pair of electrodes to measure liquid signal generation. 
: c, excitation coil in a magnetic field measurement of intraductal two excitation coil. 
D, iron core and magnetic yoke: the excitation coil of the magnetic field generated import liquid, and the magnetic circuit. 
E, shell: instrument packaging. 
2, the converter:
Is the smart secondary table, it will flow signal amplification processing??Single chip microcomputer after the operation, can display flow, total amount, and can output pulse and analog current signal, used in the measurement or control of fluid flow.
3, product assembly form:
It into a shape and size in two forms. 
A, a shape: mounted sensors and switches. 
B, size: separation installation sensor and converter, through the connecting cable form flow metering system. 
C, in order to adapt to the measurement demands of the different medium, the lining of sensor and electrode materials can have many choices.

Five, the main features:
1, the measuring accuracy is not affected by fluid density, viscosity, temperature, pressure, and the influence of the conductivity changes.
2, measuring pipe unimpeded, no moving parts, no pressure loss, low straight pipe requirements.
3, electromagnetic flow sensor with grounding electrodes, achieve good instrument grounding.
4, easy to use easy disassembly, flow sensor adopts detachable type or insert type structure, convenient maintenance and periodic verification of error.
5, electromagnetic flow sensor adopts advanced processing technology, the instrument has a good ability to resist negative pressure.
6, full digital processing, strong anti-interference ability, reliable measurement, high precision.
7, high-definition backlit LCD display, full Chinese menu operation, easy to use, simple operation, reading in bright light goods can clear night.

8, with two-way flow, two-way accumulative total function, current, frequency with bi-directional function, of output.
9, instrument system has high measurement precision, wide using range and not can be used in sewage, cement ore slurry, such as measurement, can also be used in strong acid, strong alkali liquid flow measurement.
10, the converter output power: not only have 4-20 ma, pulse output, also a RS485 and RS232, HART, such as digital communications and GPRS wireless data remote transmission.
Six, the technical parameters:
1, the nominal diameter: DN6-2200 - mm;
2, nominal pressure: 0.6, 1.0, 1.6, 4.0 MPa (high pressure can according to user requirements processing);
3, fine degree: plus or minus 0.2% () of error of plus or minus 0.5%;
4, measurement range (flow) : 0 and 1 m/s to 0 to 10 m/s;
Size, medium temperature: 5 points - 10 ℃ ~ + 80 ℃, PTFE and F46 lining - 40 ℃ ~ + 180 ℃), a body - 10 ℃ ~ + 80 ℃;
6, ambient temperature: - 25 ℃ ~ + 60 ℃;
7, environment humidity: 5 ~ 100% RH (relative humidity);
8, medium conductivity: more than 20 mu S/cm;
9, Ann outfit: the size and shape;
10, shell protection grade: sensor IP65, IP68 optional (I5: type dust tight, water proof, can allow the tap water from any direction for instrument;IP68 dust tight, scuba diving, able to work in the water for a long time) converter IP65; 
11, electrode structure: three electrode structure, two electrode structure;
12, z measured medium high temperature: chloroprene rubber lining zui high 80 ℃, 80 ℃ high polyurethane lining, ptfe lining is 180 ℃ and 120 ℃ high temperature resistant rubber lining z high;
13, the sensor output signal: 0-0.2 -p mVp to 0 to 2 mVp - p;
14 and electrode materials: stainless steel OCrl8Nil2Mo2Ti, hartz titanium alloy B, C, Ti, tantalum (Ta), stainless steel coated with tungsten carbide, special;
15, explosion-proof marks: Exm Ⅱ T4, Exmd Ⅱ BT4.
Seven, installation location choice:
In order to make the transmitter work stability, when choosing the location should be paid attention to the following requirements:
1, try to avoid strong ferromagnetic objects and concrete equipment of electromagnetic field (such as a big motor, transformer, etc.), so as to avoid the magnetic field of magnetic field effect sensor and traffic information.
2, should be installed in a dry and ventilated place, should not be in damp, easy seeper place of installation.
3, should try to avoid weathered, avoid environmental temperature is higher than 45 ℃ and relative humidity is more than 95.9%.
4, choose to facilitate maintenance and convenient place.
5, flow meter should be installed in the pump back end, never on the suction side of the installation;Valve should be installed in the downstream flow meters.
Eight, notable matters of installation:
1, when moving and lifting sensor, should will sling set beside the sensor on both ends of the flange neck position, do not in the measurement, hoisting so as not to damage the lining tube inserted into the pipe to help.
2, before the installation, the sensor electrode with alcohol cotton in carefully erased due to causes such as hand touch the surface of the electrode material grease stain.
3, the inner diameter of the sealing washer when installation should be consistent with the sounding pipe lining inside.
4, must ensure that the terminal box is dry, otherwise the instrument measurement error may result.
The preparing work before nine, run:
1, put into operation after installation wiring should be checked again before the installation, wiring is correct.(the size)
2, before the bed bottom valve is opened, the sensor after the valve closed, let the sensor with the medium.
3, after the completion of the preparation, upstream of the valve to open the first sensor, then slowly open the downstream of the valve, observe the converter instantaneous flow display should be toward the direction of change, that signal lines in the right direction.Otherwise, will signal A and B connection swap position.(the size)
4, open the sensor before and after the valve, drainage for a few minutes, the gas discharge tube.
5, close the sensor downstream of the valve, then close upstream of the valve, the measured medium is inside the sensor.And then to form a complete set of adjustment.Sensor and converter matching coefficient of zero adjustment and instrument set converter specifications, please read them.

Nine, technical specifications:

1, parameter table:

2, appearance and installation dimensions:

3, appearance size table:

Ten, how to correct selection:

Selection is very important work in instrumentation, relevant data show that the instrument in two-thirds of faults in the practical application is instrument error caused by selection or wrong installation, please pay special attention to.
1, collect data:
(1) by measurement of body composition
(2) the big flow, z z small flow rate
(3) z high work pressure
(4), z z high temperature low temperature
2, range scope confirmation:
General industrial use measured medium velocity of electromagnetic flowmeter with 2 ~ 4 m/s advisable, under special circumstances, zui low velocity should not be less than 0.2 m/s, zui high should be not more than 8 m/s.If the medium containing solid particles, commonly used flow rate should be less than 3 m/s, prevent excessive friction lining and electrode;For viscous flow, the velocity can choose more than 2 m/s, larger velocity help eliminate electrode automatic on the effect of viscous material, to improve accuracy of measurement.
Under the condition of the range of Q have been identified, according to the velocity V can be decided to the size of the flow meter diameter D, the range of the values calculated by the next type:
Q = PI D2V / 4
Q: flow (㎡ / h) D: pipe diameter V: velocity (m/h)
Electromagnetic flow meter range of Q z flow value should be greater than expected, the flow of the normal value in a full scale slightly greater than the flowmeter calibration 50 is advisable.

3, reference flow range:

4, selection of coding.

Eleven, design selection and ordering information:

1, the measured medium: name, composition, status, electrical conductivity and electrical conductivity;

2, working temperature (℃);

3, work pressure (Mpa);

4, the pipe diameter (DN), the smallest, normal, scope of quantity (m3 / h);

5, corrosion resistance, wear resistance, whether there is a negative pressure;

6, installation requirements and the environment: a body or fission, signal output, communications, power supply;

7, installation environment: protection grade and explosion-proof requirements.

After-sales service commitment:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understand the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.