Answer the cleaning and maintenance of water quality analysis instruments
Instrument maintenance
The instrument needs to be maintained after a period of continuous operation. Usually, too many imported water quality analysis instruments are intelligent analysis instruments. The common features of intelligent instruments are simple structure, powerful functions, stable performance and high reliability. Real-time data collection and processing, in-situ online measurement or remote telemetry, automatic monitoring and many more. Therefore, too many instruments (except some high turbidity instruments), the maintenance workload is relatively small. After understanding the working principle of the instrument, it is targeted for maintenance. The daily maintenance work mainly focuses on the cleaning of the water circuit (sampling pipeline), the adjustment of the optical circuit (sampling chamber, measuring tube), the circuit (probe signal, secondary instrument, etc.), and the calibration of the instrument and probe. What makes users particularly happy is that many meters are equipped with self-test (such as Micro200BW turbidity meter from HFScientific) and self-diagnosis (such as 95T / 8220 turbidity meter from GLI), which is too convenient for instrument maintenance.
Instrument cleaning
The simple way to clean the sampling pipeline and the sampling cabin 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. However, for raw water, the sampling chamber of the sloping pipe and sedimentation water meter is not enough. It is more necessary to directly clean the sampling chamber and the probe. When cleaning, be careful not to scratch the surface of the sensor and other sensing parts with a hard object, and do not directly scrub the surface of the sensor with your fingers to avoid leaving oil stains. Pay particular attention to this when cleaning the turbidity meter, because the optical path The abnormal pollution in the middle means to the turbidity of the sample water. In addition, some models of residual chlorine instrument. The sampling chamber is equipped with quartz sand to keep the electrode surface from being oxidized at all times. When performing maintenance on these instruments, it is also necessary to pay attention to whether the amount of quartz sand remaining in the sampling vessel is sufficient.
The grasp of the cleaning cycle is generally based 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 no more than once a week. For instruments with automatic cleaning devices, generally flush the pipeline once a week and check the probe every month. In some design units or installation units, the sampling pipeline is made of galvanized steel pipe, which is very unreasonable. Because such pipelines are prone to corrosion. Especially for the sampling of the factory water, the remaining chlorine is relatively high, and the galvanized steel pipe is more likely to corrode, causing low residual chlorine and high turbidity. At this time, the cleaning of the instrument probe will be more diligent.
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