Clamp electromagnetic flowmeter

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Clamp electromagnetic flowmeter adopted a new type health lining material and lining process, in lin…

Products overview:
ZW - LDE/W series clamp electromagnetic flowmeter is MCU embedded technology, digital excitation, at the same time in the electromagnetic flow meter adopting CAN field bus, belong to domestic *, technology to meet the domestic advanced level.In food, medicine and other health industry, the process often require better phase using high temperature steam cleaning and disinfection, to prevent the bacteria multiply, so the health industry quick connectors commonly used for connecting pipes and flowmeter, namely type clamp structure.

Second, the working principle:
ZW - LDE/W seriesClamp electromagnetic flowmeter based on 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 seriesClamp the electromagnetic flowmeter is made of stainless steel material, can be very convenient scene fast disassembly, cleaning, make the electromagnetic flowmeter is not easy to be polluted in the process of use, and can effectively prevent measure fluid residue accumulation in the measuring tube can be widely used in mineral water, soy sauce, jam, beer, juice, rice wine, milk and other food production process, health, chemical industry, etc.

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, the shell body: instrument packaging.
2, converter that is smart the 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 adoption of new type health lining materials and prevent the measuring medium residue in the measuring tube pile up.
2, measuring pipe unimpeded moving parts, no pressure loss, low straight pipe requirements.
3, sensors, a new generation of use special high quality lining technology, and use the special mirror polishing PFA lining.
4, intelligent converter can show the percentage volume flow at the same time, the instantaneous flow and cumulative flow measurement data.
5, the scheme of fast connect electromagnetic flowmeter is easy to remove, maintenance and cleaning.Intelligent converter adopts LCD backlight LED display, even under strong light or night can clear reading.
6, through infrared touch button to set parameters, under the harsh environment don't open the converter cover plate can also be set securely.
7, converter with self-diagnosis alarm, empty load detection alarm, traffic flow on the lower limit alarm and poles value alarm output, and other functions.
8, the 16-bit embedded microcontroller processor for signal processing, with high integration, fast calculation speed, calculation accuracy is high, the fully digital signal processing, strong anti-interference ability, reliable measurement etc.
9, high definition backlit LCD display, full Chinese menu operation, easy to use, simple operation, easy to understand.
10, with RS485 and RS232, Hart and Modbus digital communication signal output.
Six, the technical parameters:
1: nominal diameter DN10 - DN300mm
2: precision value plus or minus 0.5%, optional value plus or minus 0.3% or + / - 0.2%
3: medium temperature points size - 10 ℃ ~ + 180 ℃;A body - 10 ℃ ~ + 80 ℃
4: ambient temperature 25 ℃ ~ + 60 ℃
5 medium conductivity: more than 20 mu s/cm
Lining: PTFA
7 electrode materials: molybdenum stainless steel, hartz alloy B, hartz C alloy, titanium, tantalum, platinum, iridium alloy
8 electrode form: three electrode structure, two electrode structure, removable electrode structure
Installation: the size and shape
10: protection grade sensor IP65, IP68 optional (IP65: dust tight, water proof, IP68: dust tight, can work under water for a long time.)Converter IP67 (IP67: dust tight, can short time immersed)
Explosion-proof grade 11 explosion-proof marks: explosion-proof type sensor for ExmdIIBT4.

Seven, product advantage:
1, sensors, important parts - coil for design, and through strict real flow test, to ensure the measuring accuracy of products.
2, signal electrodes make thorough electrostatic shielding processing, to ensure that the small signal will not interference by coil, ensure the accuracy of the low velocity measurement.
3 for isolation with the outside world, coil processing, ensure the coil insulation strength for a long time, ensure the accuracy of the sensor measurement for a long time.
4, sensors, all the welding technique of argon arc welding technique, while the cost is higher, but it can guarantee the reliability of the welding (welding is the main production technology of the sensor), especially the installed coil z after welding process, to make sure that the coil is installed by argon arc welding process will not be damage.
5, structure of grounding electrode, electrode surface to form a balance, to ensure the whole measure average speed is restricted within the balance the electrode surface, can be a very good eliminate electrical noise, provide accurate measurements.
6, using customized double shielded cable.
7, programmable frequency low-frequency rectangular wave excitation, improve the stability of the flow measurement, low power loss.
8, measuring special medium (such as slurry) using high frequency excitation, eliminate noise interference.
9, USES the 16-bit embedded microcontroller processor, a fast calculation speed, high precision.
10, full digital processing, strong anti-interference ability, reliable measurement, high precision.
11, low EMI switching power supply, it is suitable for the power supply voltage variation range is big, the EMC performance is good.
12, with a single piece of circuit board to complete all function design, the SMT SMD components and surface for decoration) technology, high reliability circuit.
13, high-definition backlit LCD display in Chinese, according to the cumulative percentage flow, instantaneous flow rate, flow velocity, flow, etc.
14, menu operation, easy to use, simple operation, easy to understand.
15, has self-check and self diagnosis function, and displayed on the screen.
16, the unique design of lightning protection.

Eight, 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.
Nine, installation considerations:
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 ten, 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.

Eleven, technical specifications:

1, parameter table:

2, appearance and installation dimensions:

3, appearance size table:

12, how to correct selection:

Clamp health type electromagnetic flowmeterSelection 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)
Clamp health type electromagnetic flow meter range of Q zui 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.

13, 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.