Endress+Hauser introduces the OUSBT66 sensor for cell density measurement. Using near-Infrared (NIR) light absorbance technology, the OUSBT66 is a non-intrusive, hygienic sensor that is a good fit for real time, in-situ cell production optimization in life science processes, fermentation biomass measurement and algae growth monitoring for biofuel production. The OUSBT66 sensor uses proven optical sensor technology. The sensor emits light in the NIR region using an LED light source. On the detector side of the sensor the light is filtered to 880 nm. The level of 880 nm light detected by the receiving sensor can be directly correlated to the density of cells in the process. The body of the hygienic cell density sensor is constructed of 316L stainless steel, with a polished surface finish Ra<32 µ-inches (<0.76 µm). The only other material in the sensor head is the sapphire sensor windows. The measuring head, which contains the LED light source and optical sensor, is hermetically sealed and capable of withstanding CIP, SIP and autoclaving. The sensor can be operated continuously up to 158 F (70 C), and exposed to temperatures up to 275 F (135 C) with the lamp turned off for CIP, SIP or steam sterilization in an autoclave. The OUSBT66 sensor operates in conjunction with the Memograph CVM40 graphic transmitter and recorder.