LDB integrated electromagnetic flowmetercharacteristic
Full digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 150:1;
Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, with good EMI resistance performance;
Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, programmable low-frequency rectangular wave excitation, improved stability of flow measurement, and low power consumption;
Adopting SMD devices and surface mount technology, the circuit reliability is high;
There are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement;
On site, the range can be modified online according to the actual needs of the user;
The measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc;
High definition backlit LCD display, fully Chinese menu operation, easy to use, easy to learn and understand operation;
■ Equipped with digital communication signal outputs such as RS485, RS232, Hart, and Modbus (optional);
■ It has self checking and self diagnostic functions;
■ Hourly total recording function, which records the total flow in hours and is suitable for time-sharing measurement system (optional);
There are three integrators inside that can display the forward cumulative amount, reverse cumulative amount, and differential cumulative amount respectively. There is also a non power down clock inside that can record 16 power down times (optional);
Infrared handheld operator, 115KHZ communication speed, all functions of long-distance non-contact converter (optional).
LDB integrated electromagnetic flowmeterworking principle
According to Faraday's principle of electromagnetic induction, a pair of detection electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by the two detection electrodes, and the value is proportional to the flow rate. Its value is E=KBVD
In the formula: E-induced potential;
K - Coefficient related to magnetic field distribution and axial length;
B-Magnetic induction intensity;
V-average flow velocity of conductive liquid;
D-electrode spacing; (Measuring the inner diameter of the tube)
The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After amplification, transformation, filtering, and a series of digital processing, the instantaneous flow and cumulative flow are displayed on a backlit dot matrix LCD. The converter has 4~20mA output, alarm output, and frequency output, and is equipped with communication interfaces such as RS-485, and supports HART and MODBUS protocols.