Electromagnetic Flowmeter Common Faults and Troubleshooting

Electromagnetic flowmeter in the operation of common faults in two ways: First, the instrument itself is faulty, that is instrument structure or component damage caused by failure; Second, caused by external causes of failure, such as improper installation flow changes, deposition and knot Scale and so on. We discuss these two types of failures.

First, the instrument no flow signal output

1.Cause Analysis This type of fault is more common in the course of use, the general reasons are: (1) instrument power supply is not normal; (2) cable connection is not normal; (3) liquid flow condition does not meet installation requirements; (4) sensor zero Parts are damaged or there are adhesion layers on the inner wall; (5) The converter components are damaged. 2. Solutions (1) Confirm that the power supply has been connected, check whether the output voltage of the power circuit board is normal, or try to replace the entire power circuit board to determine whether it is good or bad. (2) Check if the cable is in good condition and the connection is correct. (3) Check the direction of liquid flow and whether the liquid in the tube is full. For electromagnetic flowmeters that can measure forward and reverse directions, if the direction is inconsistent, it can be measured, but the set display flow direction does not match and must be corrected. If you remove the sensor from a large workload, you can also change the direction of the arrow on the sensor and reset the display meter symbol. The fact that the pipeline is not filled with liquid is mainly due to the improper installation location of the sensor. Measures should be taken during installation to avoid causing the liquid in the pipeline to be dissatisfied with the tube. (4) Check whether the electrode on the inner wall of the transmitter is covered with a liquid fouling layer. For the measuring liquid that is prone to scaling, clean it regularly. (5) If it is determined that it is a malfunction caused by damage to the converter components, replace the damaged components.

Second, the output value fluctuations 1. Cause Analysis This type of failure is mostly caused by the measurement medium or the external environment, the failure can be eliminated after the outside interference is eliminated. In order to ensure the accuracy of measurement, such failures cannot be ignored. In some production environments, due to the large vibration of the measuring pipe or liquid, the flowmeter's circuit board may be loosened and the output value may fluctuate. 2. Solution (1) Confirm whether the flow of the fluid does occur due to the reason of the process operation. In this case, the flow meter only accurately reflects the flow condition, and the fault can be eliminated automatically after the pulsation is over. (2) Electromagnetic interference caused by external stray currents. Check whether there is a large-scale electric appliance or electric welding machine working in the instrument operating environment. Make sure that the instrument grounding and operating environment are good. (3) When the pipe is not filled with liquid or bubbles are contained in the liquid, both are caused by the process. At this point, the craftsman can be requested to confirm that the output value can be restored to normal after the liquid is full or the bubble is calmed down. (4) The transmitter circuit board is a plug-in structure. Due to the large vibration of the pipeline or liquid in the field, the power board of the flow meter is often loosened. If it is loose, the flowmeter can be disassembled and the circuit board can be re-fixed.

Third, the flow measurement and the actual value does not match 1. Cause Analysis This type of failure is generally caused by the following: (1) the transmitter circuit board is intact; (2) when the liquid flow rate is too low, the measured liquid contains tiny bubbles As the bubble rises and accumulates above the pipe, the liquid flow area changes, and the gas generates interference signals for a long time, which affects the measurement accuracy. (3) The signal cable is not connected well or the cable's insulation performance is reduced during use. Inaccurate; (4) The parameter setting value of the converter is inaccurate. 2. Solution (1) Check that the transmitter circuit board is intact. If the water in the junction box is corroded or corroded by the corrosive test fluid, the performance of the appliance may be reduced or damaged. The circuit board should be replaced at this time. (2) Ensure that the flow rate of the measured liquid in the pipeline is above the minimum flow limit so that the transmitter can work normally. (3) Check if the signal cable connection and the cable insulation performance are in good condition. If the signal cable is loose, reconnect it. If it is checked that the insulation of the cable does not meet the insulation requirements, you need to change the cable. (4) Set the converter set value again and verify the zero and full scale value of the converter.

Fourth, the output signal super full scale 1. Cause analysis (1) signal cable connection error or cable disconnection; (2) converter parameters are not set correctly; (3) converter and sensor model does not match. 2. Solution (1) Check if the signal circuit connection is normal or not. If the signal circuit is disconnected, the output signal will exceed the full-scale value. In this case, the signal cable must be correctly connected. At the same time, it is necessary to check whether the insulation performance of the cable is in good condition. If it does not meet the requirements, it is necessary to replace the new cable. (2) Check in detail whether each parameter setting and zero point and full scale of the converter meets the requirements. (3) Check that the model of the transducer and sensor is not matched, you need to contact the factory for exchange.

V. Zero point instability 1. Cause analysis (1) The pipe is not full of liquid or contains bubbles. (2) Subjectively speaking, the tube pump fluid does not flow but there is actually a slight flow. (3) Causes of liquids (such as poor liquid conductivity uniformity, electrode contamination, etc.). (4) The signal circuit insulation drops. 2. Solution (1) The pipeline is not filled with liquid or bubbles in the liquid are all reasons for the process. At this time, the craftman should be requested to confirm that the output value can return to normal after the process is normal. (2) There is a slight flow in the pipe. This is not a malfunction of the electromagnetic flowmeter. (3) If impurities deposit on the inner wall of the measuring tube or on the inner wall of the measuring tube, or if the electrode is contaminated, there may be a zero point change. At this time, it must be cleaned; if the zero point does not change much, you can also try to re-zero. (4) Due to environmental conditions, dust, oil, etc. may enter the watch case. Therefore, it is necessary to check whether the electrode part insulation is lowered or damaged. If it does not meet the insulation requirements, it must be cleaned.

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