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Cleaning of water quality analyzer

by:BOQU     2021-05-04

The water quality analyzer mainly adopts the ion-selective electrode measurement method to achieve accurate detection. Electrodes on the instrument: PH, fluorine, sodium, potassium, calcium, magnesium, and reference electrode. Each electrode has an ion-selective membrane, which will react with the corresponding icons in the sample to be tested. The membrane is an ion exchanger, which reacts with the ion charge to change the membrane potential, and the potential between the liquid, sample, and membrane can be measured. The two potential differences detected on both sides of the membrane will generate current. The sample, the reference electrode, and the reference electrode solution constitute one side of the loop.

The simple way to clean the sampling pipeline and the sampling chamber is to increase the valve opening, increase the flow rate of the sample water for flushing, or open the valve of the backwash pipeline installed in the sampling pipeline. But for the raw water, it is not enough to simulate the sampling cabin of the inclined pipe and the sedimentation water meter. More still, it is necessary to clean the sampling chamber and probe directly.

When cleaning, be careful not to scratch the surface of the sensor parts such as the electrode with hard objects, and do not directly scrub the surface of the sensor with your fingers to avoid leaving oil stains. Pay special attention to this when cleaning the turbidimeter. It is because the abnormal pollution in the middle of the light path means the turbidity of the sample water for the turbidimeter. In addition, some models of residual chlorine meter. The sampling chamber is equipped with quartz sand to keep the electrode surface from being oxidized at all times. When maintaining these instruments, pay attention to whether the amount of remaining quartz sand in the sample is sufficient.

The grasp of the cleaning cycle. Generally, it depends mainly on operating experience. When the sample water is particularly turbid raw water or sewage. The probe must be cleaned once every two days; the sample water of about 20mJ is usually cleaned not more than once a week.

For instruments with automatic cleaning devices, generally flush the pipeline every week and check the probe every month. Sometimes some design units or installation units use galvanized steel pipe as the material for the sampling pipeline, which is very unreasonable. Because such pipelines are easy to rust. Especially in the sampling of factory water, the remaining chlorine is relatively high, and the galvanized steel pipe is more prone to corrosion, causing low residual chlorine and high turbidity. At this time, the cleaning of the instrument probe must be more frequent.

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