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ASD25-BT-N Single Channel NIR Absorption Probe |
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The ASD25-BT-N is a high precision, single channel absorption probe. This stainless steel probe is engineered for use in pilot or production scale fermenters or bioreactors. It precisely measures the growth of microbial or cell cultures as a function of Near Infrared (NIR) absorption. This extremely durable probe is designed for sanitary bioprocess environments and can be used in CIP/SIP processes. |
The ASD25-BT-N uses light in the near infrared range (NIR) from 840 to 910 nm. The 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 ASD25-BT-N probe is available with 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 OPL are used for lower-absorbing mammalian cell cultures. Using an optical filter to control the wavelength range, the ASD25-BT-N performs concentration measurements insensitive to color changes. |
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 are electro-polished and may be specified to comply with BN2. The probe mounts conveniently through a standard 25 mm safety port (BBI). |
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