Controlling the sludge concentration (MLSS) in the aeration tank is important for making treated sewage clean at sewerage treatment plant using the activated sludge process. Therefore, measurement instruments enabling continuous and accurate monitoring of MLSS are required.
This meter is the high functional and high performance version of the MLSS meter (SSD-200) based on near-infrared and AC light technologies that we have developed for many years.

• This meter is less influenced by sludge color by adopting a special algorithm.
• This meter is less influenced by solution color. In addition, green algae does not adhere to the detector plane.
• AC lighting is performed for the light source, thus this meter is unaffected by light from outside.
• Shape of the wetted part of the detector is simple so that impurities are rarely entangled. Therefore, frequency of maintenance can be reduced.
• Vertical plane detection, which is unaffected by bubbles, is adopted; thus this meter is unaffected by bubbles.
• The conditions of devices can be grasped easily with the built-in self-diagnostic function.
• As a method for inputting calibration data, zero-span input method, regression automatic calculation method or polygonal line approximation can be selected.
• Various parameters can be changed.
• By adopting Japanese display, settings are easy with input in interactive mode.
• Digital communication between the transformer and detector makes it less susceptible to noise interference.