The model ASD19-N is a high precision, single channel absorption probe. This stainless steel probe is specially engineered for use in laboratory or pilot-scale fermenters or bioreactors. It precisely measures the cell growth of microbial or cell cultures as a function of Near Infrared (NIR) absorption. The extremely durable and ultra-sanitary ASD19-N probe is designed for autoclaving.
The ASD19-N probe uses the light in the near infrared range (NIR) from 840 to 910 nm. A precisely defined, constant LED light beam penetrates the process medium. The attenuation of the light intensity, caused by absorption and/or scattering by dissolved and undissolved substances, is detected by a hermetically-sealed photo diode.
The ASD19-N probe is available with two different insertion depths and an optical path length (OPL) of 1 mm, 5 mm, 10 mm or 20 mm. Shorter optical path lengths are typically used for dense cell cultures such as bacterial and yeast cultures. Longer OPLs are used for lower-absorbing mammalian cell cultures.
The seal-less, sapphire optical window design eliminates crevices and gaps to assure the highest level of sterility, cleanability and sensor integrity. The surface of the wetted parts is electro-polished and may be specified to comply with BN2.The probe mounts conveniently through an industry-standard, 19 mm port (M26x1) in the fermenter or bioreactor head plate.
ASD19 Features:
- Inline real time process monitoring
- Concentration measurement insensitive to color changes
- Superior sapphire window with no seals, gaps or crevices
- Extremely low maintenance
- CIP/SIP-compatible
- All wetted material and surface finishes are certifiable and traceable
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