Sartorius Stedim Biotech MD8 airscan, Operating Instructions Manual, Page: 39 / 57

9.3 How to remove a filter unit without the adapter
You can remove the complete disposable from the adapter by holding the edge of the bottom
part of the disposable. The adapter has a bevelled edge to make it easier for you to grasp the
disposable. Now proceed as under 9.2.
If you prefer to use forceps to remove the gelatin filter and place it on the agar surface
(a notch has been provided in the base of the filter unit for this purpose), do not grasp the
filter too firmly, as it is somewhat brittle and may then break.
9.4 Incubation and evaluation of collected microorganisms
After transferring the gelatin filter to the culture medium, incubate it with the petri dish
lid facing up, to avoid condensed water on the lid. The relative humidity of the air in the
incubator should be between 40-50%, and can be maintained by placing a petri dish
containing water in the incubator. The petri dish should have cams of some sort so that
excess condensed water can evaporate out. To avoid excessive accumulation of liquid on
the agar, use only plates which are 1 to 2 days old and pre-dried at room temperature.
Alternatively, the agar plates can be dried open for up to 3 hours in a clean bench. To be
certain of avoiding contamination during this, place the dish open side down but held at
a tilt with the lid beneath one side of it (Fig. 19).
| 39