The SD-40 type dual scattered-light sludge-density meter is capable of continuous measurement of dark sludge, a type un-measurable by the conventional single scattered-light device, with high stability and accuracy. The SD-40 type is a high-performance sludge-density meter that frees operators from maintenance over periods of extended use even with sludge that tends to strongly adhere. In view of the continuous measurement capability, the high resistance against the effects of bubbles, and the easy maintenance, the SD-40 type can be described as sludge-density meter with practically no flaws.
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