Model: CJDC

Discription:

The CJDC01 Intelligent Electromagnetic Flow Meter is composed of sensor and converter. It is based on Faraday's law of electromagnetic induction. It is used to measure the volume flow of conductive liquid with conductivity greater than 5 S/cm. It is an inductive instrument for measuring volume flow of conductive medium, besides measure the volume flow rate of general conductive liquids, it can also be used to measure the volumetric flow rate of strong liquid and strong corrosive liquids such as strong acid and strong alkali, and even liquid solid two phase suspension liquid such as slurry, pulp and pulp. It is widely used in oil, chemical, metallurgy, textile, papermaking, environmental protection, food and other industrial sectors and municipal management, water conservancy construction, river dredging and other areas of flow measurement.

Working Principle

According to Faraday's principle of electromagnetic induction, a pair of detection electrodes installed in the pipe wall is vertical pipe axis and the magnetic field and measurement, when the conductive liquid moves along the axis of the measuring tube, conductive liquid cuts magnetic lines to induce Induced Electromotive Force, the Induced Electromotive Force is detected by two electrode detection, and the flow rate is proportional to its value.

For value is    E=B x V x D x K

In the form:

E- Induction potential  K- Coefficient related to the distribution of the magnetic field and the axial length D- Electrode spacing (measuring the diameter of the tube)  B- magnetic induction intensity   V- average flow velocity of conductive liquid

The sensor takes the induced potential E as a flow signal and sends it to the converter. After a series of digital processing such as amplification, transformation and filtering, instantaneous liquid flow and accumulated flow are displayed in dot matrix LCD with backlight. The converter has 4 to 20mA, alarm and frequency output, and has RS-485 and other communication interfaces to support the HART and MODBUS protocols.

Features

The measurements are not affected by the changes in the density, viscosity, temperature, pressure and electrical conductivity of the fluid.

There is no pressure loss in the measurement tube, and the requirement of the straight pipe section is low. It has a unique adaptability to the measurement of slurry.

The rational selection of electrode and lining material, that is, has good corrosion resistance and wear resistance.

Full digital processing, strong anti-interference ability, reliable measurement, high precision, flow measurement range ratio of up to 150:1

The ultra low EMI switching power supply is suitable for large change range of power supply voltage and good performance against EMI.

Using 16 bit embedded microprocessor, the operation speed is fast, the precision is high, the programmable frequency is low frequency rectangular wave excitation, and the stability of the measurement is improved and the power consumption is low.

The reliability of the circuit is high by using SMD device and surface mounting (SMT) technology.

There is no movable part in the pipe, no flow component, and there is little additional pressure loss in the measurement.

In the field, the range can be modified online according to the actual needs of the user.

The measurement results have nothing to do with the distribution of flow velocity, fluid pressure, temperature, density, viscosity and other physical parameters.

High definition backlight LCD display, all Chinese menu operation, easy to use, easy to operate, easy to learn and easy to understand.

With R5485, RS232, HART and Modbus Profibus-DP and other digital communication signal output (selection).

Technical Parameter

Model Selection

The flowmeter model selection is very important in application of instrument. The related information shows that in practical application of instrument, 2/3 failures are caused by incorrect selection of model and incorrect installation of instrument to which the special attention shall be paid.

1.    Technological data collection

  a.    The measured fluid name and its chemical substances

  b.    Maximum flux, minimum flux and normal flux

  c.    Maximum working pressure;

  d.    Maximum temperature, minimum temperature.

2.    The measured liquid shall have certain conductivity, electrical conductivity ≥5μS/cm.

3.    The maximum flux and the minimum flux shall meet the values in the measurable flux range table.

4.    The actual maximum working pressure shall be less than the rated working pressure of flowmeter.

5.    The maximum working temperature and the minimum working temperature shall meet the temperature requirements stipulated for flowmeter.

6.    Whether negative pressure exists or not in the processing pipeline shall be confirmed.