污染指数（SDI）值是测定反渗透系统进水的重要指标之一。是检验预处理系统出水是否达到反渗透进水要求的主要手段。它的大小对反渗透运行寿命有着致关重要。 
污染指数SDI测定仪
污染指数（SDI）值是测定反渗透系统进水的重要指标之一。是检验处理系统出水是否达到反渗透进水要求的主要手段。它的大小对反渗透运行寿命至关重要。 

污染指数SDI测定仪操作使用方法： 
1、 将本测定仪进水球阀（2）关闭。
2、 将测定仪连接螺丝（1）安装在所测定位置。
3、 开避进水球阀（2），将调压器压力调到0.21Mpa。
取膜盒方法
4、 关闭进水球阀（2）。
5、 取下膜盒。（取膜盒方法：将快接阀（5）的外圈套向上推，膜盒自动脱落。注意：在拆卸时要拿好膜盒，防止膜盒脱落时掉地而损坏膜盒。）
6、 取下后打开膜盒，取出膜盒内“O”型圈，将0.45μ滤膜放入膜盒内的滤膜支撑板上，再将“O”型圈放入原位，盖上膜盒上盖（7），将压紧螺丝（6）拧于适当程序。
7、 将膜盒插入快接阀（5）。
8、 开启进水球阀（2）逐出滤膜盒上夹带气泡，关闭进水球阀（2），拧紧压紧螺丝（6）。
9、 开启进水球阀，同时测定出始时过滤500ml水样所需的时间t1让其继续过滤。
10、测定5、10、和15分钟时过滤500ml水样的时间（注意：在整个测试期间，压力必须保持在0.21±0.07Mpa）。
11、测定水温（注意：在整个测定期间，水温必须保持在±1摄氏度变化范围之内）。
污染指数SDI测定仪
（1）连接螺丝 （2）压力调节阀 （3）快接阀
（4）进水球阀 （5）压力表 （6）压紧螺丝
（7）膜盒上盖 （8）膜盒下托 （9）出水嘴

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Pollution index (SDI) value is an important indicator of the reverse osmosis system for determination of water. Is the test of pretreatment effluent meets the main means of reverse osmosis water requirements. Its size is important for reverse osmosis life.
Pollution index SDI tester
Pollution index (SDI) value is an important indicator of the reverse osmosis system for determination of water. Test the water reached the main means of processing system of reverse osmosis water requirements. It is the size of the reverse osmosis system, life is very important.
SDI pollution index meter operation:
1, the meter inlet valve (2) closed.
2, the tester connecting screws (1) installed in the position of measurement.
3, operating inlet valve (2), the pressure regulator pressure to 0.21Mpa.
The film box method
4, close the inlet valve (2).
5, remove the film box. (the film box method: fast connecting valve (5) of the outer sleeve is pushed upward, film box automatically fall off. Note: the demolition to take a good film, prevent the bellows fall to damaged film box)
6, remove the membrane box open, remove the membrane box "O" ring, 0.45 μ membrane into the membrane support plate membrane box, and then type "O" ring into the in situ, covered with film cover (7), the pressing screw (6) is screwed into the appropriate procedures
7, the film cartridge is inserted into the connecting valve (5).
8, open the inlet valve (2) from the filter box bubble entrainment, close the inlet valve (2), tighten the clamp screw (6).
9, open the inlet valve, simultaneous determination of initial water filtration 500ml time required for T1 to continue its filtering.
Determination of 10, 5, 10, and 15 minutes when 500ml water filtration time (Note: during the whole test, pressure must be maintained at 0.21 ± 0.07Mpa).
11, determination of water (Note: during the measurement period, the water temperature must be kept within ± 1 degrees Celsius range).
Pollution index SDI tester
(1) connected to the screw (2) pressure regulating valve (3) connecting valve
(4) inlet valve (5) pressure gauge (6) pressure screw
(7) film box cover (8) film box under support (9) and a water outlet
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