Several methods have been adopted in industry to measure the pollution trend of incoming water, such as turbidity, particle count, and pollution index（SDI）Measurement, etc. Due to the optical principle used in turbidity and particle counting measurements, non photosensitive colloids and particles cannot be detected. Therefore, it is not possible to directly measure the pollution caused by particles in suspension, that is, the impact on the membrane“Siltation ability”It is very difficult to use them to judge pollution trends.

ButSDIMonitoring methods directly measure pollution trends,ASTM D4189-95The regulations stipulateSDIThe measurement method is to measure a certain volume of water sample passing through a microporous filter under a certain pressure and standard interval time（0.45μm）The blocking rate.

Usually,ROThe reverse osmosis system is used to import raw waterSDIValue less than1In this case, there have been no problems operating for several years; If in raw waterSDIValue less than3If operated under certain circumstances, there is no need to clean the film for several months. However, in the raw waterSDIThe value is3～5The operating system,

1

It is necessary to clean the membrane frequently, as such systems usually do not function properly.SDIValue greater than5The raw water cannot be used at allROThe inflow of water. Therefore, accurate and timely monitoringROInfluentSDIIt is very necessary.

However, artificialSDIMeasurement is a tedious and time-consuming task.

Xiwo Company'sEZ SDIThe pollution index automatic measuring instrument can automatically and continuously monitorROPollution index of incoming water. The operator can quickly and accurately detect the effectiveness of the reverse osmosis pretreatment system, thereby enablingSDIPollution index detection is no longer cumbersome and minimizes manual monitoring errors to the greatest extent possible.

EZ SDIUsed itASTM D4189-95The standard testing methods described in the document are used for each5、10and15Calculate based on minute intervalsSDIFor well water, filtered water, and clarified low turbidity water（<1.0NTU）The water can also be accurately measured.