Name: SDI Pollution Index Tester
Test film：with 25pcs hole diameter :0.45um
Application: SDI pollution indextesting
Aluminum alloy SDI pollution index tester + Test film 25pcs
SDI Pollution Index Detector Manual
1. Install the SDI tester in the testing position of the system. At the beginning, inside the SDI tester
Cannot place microporous filtration membrane.
2. Open the valve on the tester and release a few liters of water to flush out impurities from the pipeline, in order to prevent
Affects the accuracy of test results.
3. Close the valve on the SDI detector, remove the "0" ring from the diaphragm box of the detector, and use a special
Use tweezers to place a 0.45M microporous membrane on the membrane box support plate of the tester, with the front of the membrane
It must face upwards. Gently press down on the "0" ring and the cover of the film box, and tighten the plastic screws,
But don't be too tight.
4. Open a portion of the valve and slowly loosen one or two of them when water flows through the tester
Plastic screws allow water to flood out of the tester to expel air from inside.
5. Make sure there is no more air inside the tester and gently tighten the plastic screws. fully open
Valve, adjust the pressure of the pressure reducing valve to 0.21 MPa (30 PSI) and maintain this pressure throughout
During the testing period, the pressure must be maintained at 0.21 ± 0.07MPA.
6. Collect water samples in a suitable container with a large mouth cup. Prepare a 500ML measuring cylinder and seconds
Table.
7. Fully open the valve and use a stopwatch to measure the time required to collect 500 milliliters of water sample,
And record as T (1)=__ seconds. After collecting, keep the valve open to allow the water to continue flowing
Continued outflow.
8. After 5 minutes, use a stopwatch to measure the time required to collect another 500ml water sample
And record it as T (5)=_ seconds. After 10 and 15 minutes, do the same test again and divide it into two parts
Do not record as T (10) and T (15).
9. After the detection is completed, the SDI value can be calculated.
10. Attention: During the entire testing process, the portable SDI instrument system should be kept vertically placed
Set. During the entire testing period, the water temperature must remain consistent within a range of 1 degree Celsius
Inside.
11. The SDI value is calculated using the following formula:
SDI=100P30/TT=100 (1-T1/T2)/TT
P30- blockage index at 207KPA (0.21MPA) inlet pressure;
The total testing time (minutes) for TT is usually T15, at which point P30<75%, otherwise the test will be conducted
T10 or T5, make P30<75% at this time
T1- The time required to collect 500ML of water sample at the initial stage (in seconds);
T2- After T1 (usually T15, which is 15 minutes), collect 500ML of water sample
Time (in seconds).
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