Submersible electromagnetic flowmeter

Products overview:
ZW - LDQ seriesSpecial design with Chinese liquid crystal display backlight wide temperature, functional and practical, direct display, convenient operation, can reduce the inconvenience by other electromagnetic flowmeter menu in English.In addition we * design more than 4 to 6 electrode structure, further to ensure the accuracy of measurement and at any time without grounding ring, reduced the meter size and the installation and maintenance of trouble.Diving type flowmeter is high precision, high reliability and long service life of flow meter, so in the design of product structure, material selection, process, production assembly and the factory testing of every link in the process of we are all very detailed standards, we also design a set of ideal home is current, applied to the production equipment of electromagnetic flowmeter and traffic flow calibration device, thus both in software and hardware can effectively guarantee high quality products for a long time.

Second, the working principle:
ZW - LDQ seriesDiving type the principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction electric liquid for cutting lines of magnetic force in magnetic field movement, potential is induced in the conductor, the induced potential E as follows:
E = KBVD;Type: K -- -- -- -- -- instrument constants;
B -- -- -- -- -- magnetic induction intensity;
V -- -- -- -- -- measurement of average flow velocity in the piping section;
D -- -- -- -- -- measuring inner diameter of the pipe cross section;
Measuring flow, the electrical conductivity of liquid with velocity V.
Through the perpendicular to the flow direction of magnetic field, the flow of the liquid conductivity sense if a voltage is proportional to the average flow velocity, the induced voltage signal by two or more direct contact with the liquid electrode detection, and through the cable to the converter by intelligent processing, then the LCD display or converted into 4 ~ 20 ma 01 KHZ and standard signal output.
Applications:
ZW - LDQ seriesDiving type electromagnetic flowmeter is suitable for the accurate and stable measurement of the conducting liquid and slurry flow in a closed pipe, accumulated flow rate and flow velocity, such as:
Clean water, sewage, water, raw water life.
Sulfuric acid, hydrochloric acid, nitric acid, etc. Various kinds of acid, alkali, salt solution, etc.
Mud, mud, pulp, pulp, and lime.
Liquid food.
The flow of oilfield water injection station of mother liquor (high pressure) measurement, etc.
Widely used in metallurgy, paper making, water treatment, chemical industry, light industry, textile, food and beverage, food and beverage, agricultural irrigation, hydropower station, oil fields, power and mining industries,
Four, the main features:
1, flow measurement is not affected by the fluid density, viscosity, temperature, pressure and conductivity changes, the influence of sensor induction voltage signal, and a linear relationship between the average flow, so the measurement precision is high.
Passage 2, measuring the pipe flow, so there is no additional pressure loss;
3 no moving parts, measure the pipe, so very long sensor life.
4, due to the induced voltage signal is formed in the whole space full of magnetic field, is the average of the pipeline on the surface of the load, the amount of straight pipe required sensor is shorter, length of 5 times the pipe diameter.
Part 5, sensor only lining and electrode contact with liquid to be tested, as long as reasonable selective electrode and lining materials, corrosion resistance and wear resistance.
6, LD converter adopts international advanced microcontroller (MCU) and surface mount technology (SMT), reliable performance, high precision, low power consumption, stable zero, parameter setting is convenient.Click on the Chinese display LD, display cumulative flow and transient flow, flow velocity, flow percentage, etc.
7, bidirectional measuring system, the measurable positive flow, reverse flow.The use of special production technology and high quality materials to ensure the performance of the product in a long time remained stable.
Five, the technical parameters:

1, the nominal diameter: (, 100, 200, 400, 600, 800 mm;
2, accuracy: + / - 1.0%;Plus or minus 2.0% (share) and simulation of sensor;
3, measuring range: 0 ~ 1 m/s to 0 ~ 10 m/s (velocity);
4, medium conductivity: p 5 mu s/cm;
5, diving depth: 10 m;
6, electrode materials: titanium molybdenum stainless steel, Ti, hartz alloy, hartz alloy C B, special;
: 7, medium temperature 0 ℃ ~ + 40 ℃.
8, the sensor output signal: 0 ~ 0.2 mVp ~ p to 0 ~ 2 mVp ~ p;
9, flow meter output signal: 4 ~ 20 ma. DC and 0 ~ 5000 hz or 0 ~ 2000 hz;
10, product standards: CJ/T3017 ~ 1993 dive type electromagnetic flowmeter.

Vi.Installation requirements:
The choice of installation environment
1, should as far as possible away from strong electromagnetic field equipment.Such as big motor, transformer, etc.
2, the installation place should not have a strong vibration, environmental temperature change is not big.
3, easy to install and maintenance.
The choice of the installation position
1, sensors, flow mark on the direction of the measured medium flow and the pipe must be consistent.
2, installation location must ensure that the measuring tube in the book is full of measured medium.
3, and the choice of fluid flow pulse smaller places, which should be far away from the pump and local resistance (valve, elbow, etc.)
4, the measurement of two-phase fluid, should choose is not easy to cause the location of the phase separation.
A negative pressure, avoid installed in a tube of five places.
6, when makes the electrode measured medium, measure the tube inner surface adhesion, scaling, suggest the measuring tube flow velocity of no less than 2 m/s.
At this time can use reducing pipe diameter slightly smaller than the process.For uninterrupted flow in the process piping cleaning electrode and the measuring tube, sensor can be used parallel installations, and cleaning.
The choice of the installation site
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.

The preparing work before seven, 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.

Eight, installation considerations.
1, the axis of the measuring electrode must be similar to horizontal direction;
2, measuring the pipe must be completely filled with liquid.
3, less flowmeter zui ahead to have 5 * D for flow meter diameter (D) the length of the straight pipe, the rear zui to have less 3 * D for flow meter diameter (D) the length of the straight pipe;
4, the direction of fluid flow and the direction of arrow flowmeter;
Five should have can be damaged by vacuum meter, the pipe lining, special attention should be paid;
6, near the flow meter should be no strong electromagnetic field;
7, shall have plenty of space, near the flowmeter to installation and maintenance;
8, if measuring pipeline vibration, the flowmeter should be fixed on both sides of bearing when measuring the mixed liquid of different medium hybrid point and the distance between the flowmeter zui to have less 30 x D for flow meter diameter (D) the length of the cleaning and maintenance for the convenience of the flowmeter, should install bypass pipe.

Nine, product selection and application example:
When placing order, must according to the measured object and measuring conditions, the right to choose the appropriate sensor, and please note the following:
1, the full scale flow meter shall be not less than the current body of zui big flow rate, and make the common flow by more than 50% of the range, in order to obtain high measurement precision.
2, electrode materials should be chosen according to the measured medium corrosion situation suitable electrode.
3, sensors, nominal menstruation choice according to the following provisions: first of all, according to the measured channel z big flow according to the formula to calculate the sensor (1) the zui large average flow velocity: the Vm = 353.7 X Qm/D2...(1)
Type: the Vm z with large flow, through the sensor velocity (m/s) measured channel of Qm - z flow quantity (m3 / h)
D - nominal sensor drift diameter (mm) and then press (2) and the head loss h = V2m / 2 g...(2)
Type: h - head loss (m) g - the gravitational acceleration (g = 9.81 m/s2) such as calculate h > 0.3 m, can increase nominal sensor drift diameter or add simulation sensor.
And 4, and simulation sensor, measurement of large flow rate.
In order to avoid water level difference is too big, can use simulation sensors to bypass.Diving the appearance of electromagnetic flow simulation sensor size and installation size.When a sensor and the sensor with one or several simulation, the actual flow for a sensor to measure flow value multiplied on multiple.The following diagram simulation sensor (number 1)
For example: sensor and a sensor and a simulation, actual flow channels for sensors indicate traffic multiplied by 2.Other, etc, in this way can cut down the cost of instrument.When simulation sensor and sensor and its measuring accuracy is plus or minus 2.5%.

tenAnd the reference flow range:

Eleven, selection of coding:

Twelve, 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.