A syringe block (1) includes a plurality of syringes (2) and a collector (3), the syringes each having a suction volume, and the collector includes electromagnetic valves. First tubes directly link the electromagnetic valves to the internal volumes and second tubes extend from the electromagnetic valves towards the containers for the sample and/or other liquids, at least one of the syringes being an air pump (15, 16). The syringe block can be used as a support for various components used for the operation thereof, and can be arranged in a climatic condition reproducer. One such syringe block is especially adapted to be used in a liquid analyser, the air pump being used especially to take a sample and/or to drain and clean different recipients containing a sample.