Patent ID: 7641866

Claim:
A multi-station reaction apparatus ( 1 ) comprising a heat transfer block ( 30 ; 30 ′), formed with a plurality of cavities ( 31 ) for receiving respective reaction vessels ( 36 ), for transferring heat to and from the reaction vessels ( 36 ) collectively, and a removable cooling module ( 4 ; 4 ′), characterised in that the heat transfer block ( 30 ; 30 ′) and removable cooling module ( 4 ; 4 ′) are such that the removable cooling module ( 4 ) is either housed within a central recess ( 32 ) formed in the upper surface of the heat transfer block ( 30 ), around which recess ( 32 ) the plurality of cavities ( 31 ) are arrayed, or shaped so as to have a central recess ( 45 ) within which the heat transfer block ( 30 ′) is located when the cooling module ( 4 ′) is in use.