AR 2000 Operator's Manual
72
Configurations for the Cooling Water
The minimum temperature and the cooling rate attainable on the Upper Heated Plate will depend on the
temperature, flow rate and heat capacity of the circulating fluid. In general, provided that the flow rate is
adequate, the minimum temperature will be about 5°C above that of the circulating fluid at the inlet, although
this will depend on the ambient conditions. The standard configuration is with water as the circulating fluid,
in which case mains water or a general laboratory circulator can be used.
It is recommended that separate sources should be used for the cooling water supplied to the Peltier plate and
the Upper Heated Plate, as the pulsing of the cooling water can influence the instrument normal force reading.
However, the same supply may be used for both units, provided that sufficient pressure is available to ensure
adequate flow through both (for example from an FP50-MS fluid circulator available from Julabo GmbH,
www.julabo.com; mains water supply is also normally suitable). Note that if a single supply is used, the Peltier
and Upper Heated Plate should always be connected in parallel, never in series. Some possible configurations
are shown below.
Important: For efficient operation, the Peltier plate and Upper Heated Plate should be con-
nected in parallel, NOT in series, if the same water supply is used for both.
Important: Pour une opération efficace, le plan de Peltier et l’Upper Heated Plate devraient
être reliés en parallèle, PAS en série, si la même source en eau est employé pour tous les
deux.
Figure 7.8
Cooling Water Configuration 1
Mains Water Supplying Both Peltier and Upper Heated Plate
Figure 7.9
Cooling Water Configuration 2
Fluid Circulator Supplying Both Peltier and Upper Heated Plate
Air Inlet
Mains Water Flow
Non-Return
Valve
"Y"
Piece
Drain
Air Inlet
Circulator
Water Flow
Return
"Y"
Piece
Drain
"Y"
Piece
Reducer
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