The invention relates to real-time array PCR cartridges. The cartridge (100) has a fluid chamber (101) for a fluid bath (102) and a first support element (200) for fixing a microarray (103) in the fluid chamber (101). Thereby the first support element (200) fixes the microarray (103) in such a way that a change of a size of the microarray (103) due to thermal expansion of the microarray (103) is possible without inducing substantial mechanical stress to the cartridge (100). Thereby the cartridge materials chosen independently from thermal expansion coefficients of different microarrays that are to be inserted and fixed into the cartridge (100).
