Electrode: Its function is to extract and induce a proportional induced inductive potential signal. The electrodes are typically made of non-magnetically conductive stainless steel and are required to be flush with the liner so that the fluid passes unimpeded. It should be installed in the vertical direction of the pipe to prevent deposits from accumulating on it and affecting the measurement accuracy.
Enclosure: Made of ferromagnetic material, it is the cover of the distribution system excitation coil and isolates the interference of external magnetic field.
Lining: A complete electrical insulation lining on the inside of the measuring tube and on the flange sealing surface. It directly contacts the liquid to be measured, and its function is to increase the corrosion resistance of the measuring catheter and prevent the induced potential from being short-circuited by the metal measuring tube wall. Most of the lining materials are PTFE plastics and ceramics that are resistant to corrosion, high temperature and wear.
Converter: The induced potential signal generated by the liquid flow is very weak and is greatly affected by various interference factors. The function of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main interference signal. Its task is to amplify the induced potential signal Ex detected by the electrode into a unified standard DC signal.
Intelligent GPRS MAG flow meter features
☆ Timing acquisition of electromagnetic flowmeter data: The electromagnetic flowmeter is used to send a data mode to the host every hour.
The data includes:
(1) Instrument status part: module address, module name, current module time, module battery status;
(2) Meter data part: instantaneous flow rate, instantaneous flow rate, fluid conductivity ratio, positive and negative cumulative value
☆ Support short message, fixed IP and dynamic IP address transmission. Data transmission is stable and reliable, low power consumption, and low battery alarm. SMS (SMS): Support all China Unicom and China Mobile SIM
card users; GPRS mode: support for the opening of GPRS wireless Internet access (GPRS access point must be CMNET) China Mobile SIM card users
☆ GPRS communication supports two modes of TCP and UDP, and supports two connection modes of IP address and dynamic domain name.
☆ Integration of acquisition and transmission, improving system reliability and reducing costs;
☆ Do not crash, automatically restore after dropped calls;
☆ GPRS remote online setting and short message remote setting function;
☆ Onboard industrial grade GSM/GPRS communication module, convenient for users to choose GSM/GPRS networking mode
☆ Provide user setting software, open interface
☆ Good waterproof performance
Sensor check
Test equipment: one 500MΩ insulation resistance tester, one multimeter.
Test steps:
(1) When the pipeline is filled with medium, measure the resistance between terminals A, B and C with a multimeter. The resistance between A-C and B-C should be equal. If the difference is more than 1 time, there may be leakage of the electrode, condensation on the outer wall of the measuring tube or the junction box.
(2) In the case of lining drying, measure the insulation resistance between A-C and B-C with MΩ meter (should be greater than 200MΩ). Then use a multimeter to measure the resistance of the two electrodes in terminals A and B and the measuring tube (should be in short-circuit communication). If the insulation resistance is small, indicating that the electrode is leaking, the entire flowmeter should be returned to the factory for repair. If the insulation is reduced but there is still more than 50 MΩ and the inspection result of step (1) is normal, the outer wall of the measuring tube may be damp, and the inside of the outer casing may be dried by a hot air blower.
(3) Use a multimeter to measure the resistance between X and Y. If it exceeds 200 Ω, the excitation coil and its lead wire may be open or poorly connected. Remove the terminal block check.
(4) Check the insulation resistance between X, Y and C, which should be above 200 MΩ. If it is lowered, dry the inside of the casing with hot air. In actual operation, the decrease in coil insulation will result in increased measurement error and unstable instrument output signal.
(5) If it is determined that the sensor is faulty, please contact the manufacturer of the electromagnetic flowmeter. The general site cannot be solved and needs to be repaired by the manufacturer.