LDY-15S electromagnetic flowmeter in the operation of some faults

The main components of the LDY-15S electromagnetic flowmeter sensor are: measuring tube, electrode, excitation coil, iron core and yoke shell. It is mainly used to measure the volume flow rate in conductive liquids and slurries in closed pipes. Including highly corrosive liquids such as acids, alkalis, and salts. This product is widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, paper and other industries as well as environmental protection, municipal management, water conservancy construction and other fields. The electromagnetic flowmeter is a fully intelligent electromagnetic flowmeter developed using domestic and foreign technologies. Its all-Chinese electromagnetic converter core uses a high-speed central processor. The calculation speed is very fast, the accuracy is high, and the measurement performance is reliable. 1. Installation: The fault is usually caused by the incorrect installation position of the electromagnetic flow sensor. Common problems include installing the sensor at the highest point of the piping system where gas is likely to accumulate; or installing it on a vertical pipe from top to bottom, which may cause emissions. Empty; or there is no back pressure behind the sensor, and the fluid is directly discharged into the atmosphere, resulting in a non-full tube in the measuring tube. 2. Environmental aspects: Usually the main interference is stray current interference from pipelines, strong electromagnetic wave interference from space, magnetic field interference from large motors, etc. Pipeline stray current interference usually requires good independent grounding protection to obtain satisfactory results. However, if a strong stray current is encountered (such as electrolytic workshop pipelines, sometimes the AC potential peak value Vpp induced on the two electrodes can be as high as 1V), it is still possible to obtain satisfactory results. Additional measures need to be taken to insulate the flow sensor from the pipeline. Space electromagnetic wave interference is generally introduced through signal cables and is usually protected by single or multi-layer shielding. 3. Failures during commissioning: Failures during commissioning generally occur during the instrument installation and commissioning stage. Once eliminated, they will not reoccur under the same conditions in the future. Common faults during commissioning are usually caused by improper installation, environmental interference, and fluid characteristics. 4. LDY-15S electromagnetic flowmeter fault during operation: fault during operation is a fault that occurs after the electromagnetic flowmeter has been debugged and operated normally for a period of time. Common faults during operation are basically caused by the adhesion layer on the inner wall of the flow sensor, lightning strikes and changes in environmental conditions. caused by other factors. Since electromagnetic flowmeters are often used to measure dirty fluids, after running for a period of time, an adhesion layer will often accumulate on the inner wall of the sensor, causing failure. These failures are often caused by the conductivity of the adhesion layer being too large or too small. If the attachment is an insulating layer, the electrode circuit will be open-circuited and the instrument will not work properly; if the conductivity of the attachment layer is significantly higher than the conductivity of the fluid, the electrode circuit will be short-circuited and the instrument will not work properly. Therefore, the attached scaling layer in the electromagnetic flowmeter measuring tube should be removed in time.

5. Fluid: The measured liquid contains evenly distributed tiny bubbles which usually do not affect the normal operation of the electromagnetic flowmeter. However, as the bubbles increase, the instrument output signal will fluctuate. If the bubbles are large, When it is enough to cover the entire electrode surface, as the bubbles flow through the electrode, the electrode circuit will be instantly disconnected and the output signal will fluctuate even more. When an electromagnetic flowmeter with low-frequency square wave excitation measures slurry with excessive solid content, it will also produce slurry noise, causing the output signal toproduce fluctuations. When measuring mixed media, if the flow sensor is entered for measurement before the mixture is uniform, the output signal will also fluctuate. Improper selection of electrode material and measured medium will also affect normal measurement due to chemical effects or polarization phenomena. The electrode material should be correctly selected according to the instrument selection or relevant manual. 6. LDY-15S electromagnetic flowmeter lightning strike: Lightning strikes can easily induce high voltage and surge current in the instrument circuit, causing damage to the instrument. It is mainly introduced through related channels such as power lines or excitation coils or flow signal lines between sensors and converters, especially the majority of them introduced from the control room power lines. 7. Changes in environmental conditions: During the debugging period, because the environmental conditions are still good (for example, there is no interference source), the flow meter works normally. At this time, it is often easy to ignore the installation conditions (for example, the grounding is not very good). In this case, once the environmental conditions change and new interference sources appear during operation (such as electric welding on the pipeline near the flow meter, large transformers installed nearby, etc.), it will interfere with the normal operation of the meter and the output of the flow meter. The signal will fluctuate.