Abstract: A sampler for chemical analyzers includes a syringe placed internally to the sampler for withdrawing from one or more containers predetermined quantities of substances for carrying out chemical analysis; a support and movement group of the syringe; a transponder stably associated to the syringe and containing information relating to a plurality of the technical specifications of the syringe. The sampler also includes: a communication device with the transponder to read the information on the syringe; a logical control unit operatively connected to the communication device to determine, by means of such information, the type of syringe placed internally to the sampler and to activate an acknowledgment signal when it is suitable to perform the withdrawal of predetermined quantities of substances, and a blocking signal of the sample when the type has technical specifications not suitable to perform the withdrawal.