Peltier temperature-controlled cell holders/cell changers
Peltier temperature-controlled 6-cell changer
13.3 Peltier temperature-controlled 6-cell changer
13.3.1 Use
The cell changer is an automatic sample changing system. Its stepper motor driving unit
is driven by the software. Temperature control of the cell holder is performed via a
separate temperature-control unit. The coolant circuit of the heat exchanger keeps the
rear side of the Peltier elements at a temperature near the ambient temperature.
The controlling sensor used is a Pt100 measuring sensor located in the upper part of the
cell block. In addition to the controlling sensor, the cell holder contains two further Pt100
sensors for optional monitoring of either the holder or the cell temperature.
The cell holder contains six positions for cells having a pathlength of 10 mm and external
dimensions of 12.5 x 12.5 x 45 (L x W x H in mm).
The cell sensor is specially designed for standard cells with round PTFE stopper. It may
remain in the cell during the analytical measurement.
Note
When using other cells, the immersed measuring sensor may project into the sample
beam thus distorting the measurement results.
The stepper-motor drive of the driving unit moves the cell holder to the next sampling
place within approximately 1 second. In combination with a reflected-light optocoupler,
which defines the starting point of the motion range, the stepper drive ensures exactly
reproducible alignment of the cells to the measuring beam.
1 Temperature control unit with status indicator for heat exchanger
2 Heat exchanger
3 Peltier temperature-controlled 6-cell changer
Fig. 13-8 Peltier temperature-controlled 6-cell changer with SPECORD
®
210
User’s Manual SPECORD 200/205/210/250 – Accessories 07/2005 69
Analytik Jena AG
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