4.1 Collection of single samples4.2 Collection of multiple samples
Sometimes it could be useful to take samples during a process, at a moment which is not known in advance.
For example, during fermentation (or any other biological, chemical or physical processes) certain limit values a ctivates the alarm signal . This signal can be used to take a fraction. This fraction may be essential to recognize the reason for the alarm.
The fraction collector can take one or several samples after detection of a signal 3 to 12 V (or 12 to 30V with a 3300 ohm resistor switched in series). The LAMBDA peristaltic pump will be activated automatically.
For safety reasons the voltage of the external signal must not exceed 48 V to earth!
If the collector operates in normal modus, it will take a single fraction of selected time or volume after the reception of a signal impulsion. It will then move to the next position and wait the following signal. This operation will go on until the detection of a stop signal.
If the collector operates in the high modus, after detection of a signal it will take the number of fractions programmed under “NUMB”, e.g. from 1 to 999 (refer section 3.7).
This feature is particularly interesting, when it is necessary to wash tubing before taking the fresh significant sample. This is very important during fermentation processes or cell cultures, where the culture may be inactivated when kept in the tubing for a long period of time. The same is true for any other process where the sample quality might be affected by staying in the tubing