ANGJI’s sewage flow meters are affordable and very popular. The measurement of sewage flowmeter is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. It can display flow rates and has multiple outputs: current, pulse, digital communication HART.Using special production processes and materials to ensure the stability of product performance over a long period of time.
Next, we will discuss the causes and solutions of malfunctions in sewage flow meters:
1.Sewage flowmeter has no flow output
This type of malfunction is more common during use, and the reasons are generally:
(1) The power supply of the instrument is abnormal;
(2) The cable connection is abnormal;
(3) The flow condition of the medium does not meet the installation requirements;
(4) Damaged sensor components or adhesive layers on the inner lining;
(5) The converter components are damaged.
Solution
(1) Confirm that the power has been connected, check if the output voltage of the power circuit board is normal, or try replacing the entire power circuit board to determine its quality.
(2) Check if the cables are intact and if the connections are correct.
(3) Check the flow direction of the tested medium and whether the medium inside the tube is filled. For sewage flow meters that can measure in both forward and reverse directions, although they can measure in different directions, if the set displayed flow rate does not match in both directions, it must be corrected. If dismantling the sensor requires a large amount of work, you can also change the direction of the arrow on the sensor and reset the display instrument symbol. The main reason why the pipeline is not filled with medium is due to improper installation of sensors. Measures should be taken during installation to strictly follow the installation requirements and avoid causing the medium inside the pipeline to be insufficient.
(4) Check whether the electrodes on the inner wall of the transmitter are covered with a medium scar layer. For measuring media that are prone to scar formation, they should be cleaned regularly.
(5) If it is determined that the fault is caused by damage to the converter components, replace the damaged components.
2.Zero point instability
cause analysis
(1) The pipeline is not filled with liquid or the liquid contains bubbles.
(2) Subjectively, it is believed that there is no flow of liquid in the tube pump, but in reality, there is a slight flow.
(3) Reasons related to liquids, such as poor uniformity of liquid conductivity and electrode contamination.
(4) Water ingress into the terminal box or moisture damage to the excitation coil can cause a decrease in the insulation of the excitation coil circuit to ground.
Solution
(1) The pipeline is not filled with liquid or there are bubbles in the liquid due to process reasons. In this case, the process personnel should be requested to confirm. After the process is normal, the output value can be restored to normal.
(2) There is a slight flow in the pipeline, which is not a malfunction of the sewage flow meter.
(3) If impurities deposit on the inner wall of the measuring tube or scale forms on the inner wall of the measuring tube, or if the electrode is contaminated, zero point changes may occur, and cleaning is necessary at this time; If there is not much change in the zero point, you can also try resetting it.
(4) Due to the influence of environmental conditions, water, dust, oil stains, etc. may enter the terminal box. Therefore, it is necessary to check whether the insulation of the electrode part has decreased or been damaged. If it does not meet the insulation requirements, it must be cleaned.
Have you gained a better understanding of sewage flow meters through the analysis of the causes and solutions for their malfunctions mentioned above?
ANGJI is a professional manufacturer of sewage flow meters. If you want to learn more about our products, please feel free to contact us!
Post time: Jun-12-2025