The liquid contains a solid phase liquid containing solids such as powder, granules or fibers, which may cause failures; 1 slurry noise; 2 electrode surface contamination; 3 conductive deposition layer or insulating deposition layer covering the electrode or lining; 4 lining is worn or Covered by sediment, the flow cross-sectional area is reduced.
Instance
2
Conductive deposition layer short circuit effect. If the electromagnetic flow sensor is used to measure the conductive lining of the insulating lining of the tube, the flow signal will be short-circuited to disable the meter. Since the conductive material is gradually deposited, this type of fault usually does not appear in the commissioning period, but it does not appear until after a period of operation.
Used in a diesel cutting machine tool shop electrolytic cutting process test device
DN80mm
The meter measures and controls the flow of saturated salt electrolyte for optimum cutting efficiency. At first the instrument is running normally and intermittently.
2
After a month, I feel that the flow display value is getting smaller and smaller until the flow signal is close to zero. On-site inspection revealed that a layer of yellow rust was deposited on the surface of the insulation layer, and the instrument was operating normally after wiping and cleaning. The yellow rust layer is caused by the deposition of a large amount of iron oxide in the electrolyte.
This example is a fault in the running period. Although it is not a common fault, if the ferrous metal pipeline is seriously corroded, the rust layer will be deposited. Anything that starts to function normally and the traffic is getting smaller and smaller over time should be analyzed for the possibility of such failures.
Shanghai Beverly Automation Technology Co., Ltd.
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