HEL sewage electromagnetic flowmeterIt is an industrial instrument designed based on Faraday's law of electromagnetic induction, dedicated to measuring the volumetric flow rate of conductive liquids and slurries, widely used in municipal water supply, environmental treatment, chemical metallurgy and other fields. The core principle is that when a conductive fluid (such as sewage, acid-base solution, mud) cuts a magnetic field, the movement of charged particles in the fluid generates induced electromotive force, which is proportional to the fluid flow rate. The flow rate can be calculated by measuring the electric potential.
The device consists of a sensor and a converter. The sensor part includes a pair of magnetic poles (N and S) and two electrodes. The magnetic poles generate a magnetic field perpendicular to the pipeline, and the electrodes are used to extract induced potential signals; The converter amplifies and processes the weak potential signal, and finally outputs flow data. There are no moving parts or resistance parts inside the measuring tube, so there is no pressure loss, it is not easy to block, and the maintenance is small and the service life is long.
HEL sewage electromagnetic flowmeterDaily maintenance:
1. Electrode maintenance
Cleaning electrodes:
Dirt, scaling, or corrosive substances in sewage can easily adhere to the electrode surface, causing signal distortion.
Method: Regularly (such as monthly) wipe the electrodes with a soft bristled brush or towel. Stubborn dirt can be soaked in neutral cleaning agents (such as alcohol or dilute hydrochloric acid) and cleaned.
Caution: Avoid using metal tools to scratch the electrodes to prevent damage to surface coatings (such as platinum and titanium coatings).
Check electrode corrosion:
If there are corrosion spots or cracks on the electrode, it should be replaced in a timely manner (depending on the material selection, such as 316L stainless steel, Hastelloy alloy, or titanium electrode).
2. Lining inspection
Preventing mechanical damage:
Lining materials (such as polyurethane, rubber, PTFE) that come into long-term contact with wastewater may leak due to wear, scratches, or aging.
Method: Regularly (such as quarterly) check the surface of the lining for smoothness, cracks, or peeling.
Repair or replace:
Minor damage can be repaired (if using specialized adhesive), while severe damage requires replacement of the lining pipe section.
3. Grounding system maintenance
Grounding ring inspection:
Loose or corroded grounding rings can affect signal stability and even lead to static electricity accumulation.
Method: Regularly (e.g. every six months) check whether the grounding ring is tightened, whether the surface is oxidized, and replace it if necessary.
Grounding resistance test:
Use a grounding resistance tester to check the grounding resistance, which should be ≤ 10 Ω, otherwise it needs to be re grounded.