Labfors 5 – Version for Microorganisms
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22 January 2019
The sensors possess a measurement segment that is optimised in
terms of flow and sterility. The seal-free design of the sapphire win-
dow means that there are no gaps or joints. This guarantees com-
plete sterility. All components that come into contact with the media
are made of electrolytically polished steel.
Main components
1 LED light source
2 Sapphire window
3 Optical path length (OPL)
4 Daylight filter
5 Silicon photodiode detector
A defined LED light beam is shone through the process medium.
The weakening of the light intensity, which is caused by absorption
and/or diffusion by the dissolved and undissolved particles in the
carrier medium, is detected by a hermetically encapsulated silicon
photodiode.
The ASD-N sensors use the light in the near-infrared range (NIR)
of 840 nm to 910 nm.
4.6.2 Calibrating the Zero Point
Optek sensors are pre-calibrated in the factory. Inserts are availa-
ble for reference measurement.
Due to the different light absorption of different media, zero point
calibration should be performed before each cultivation process.
This can be done on the operating panel, either
before or after
autoclaving, depending on the application in question. For more
details refer to the separate operating manual of the touch screen
software.
4.6.3 Mounting the Sensor
Optek-ASD sensors can be mounted directly into 12 mm / Pg13.5
ports. An additional adapter is necessary for mounting the sensor
into a 19 mm port. In order to adjust the mounting depth of the sen-
sor, an electrode holder is needed. For details see chapter “Acces-
sories”, “Electrode Holder”.
Please note the following points when mounting the components:
Ensure that the sensor is fitted with an O-ring; fit an O-ring if
necessary.
Mount the sensor by hand – do not use any tools!
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Содержание Labfors 5
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