pressures in annulus 26 or they may be selected so that they are ruptured simultaneously at the same pressure in annulus 26 another important feature of fluid sampler 100 is that the multiple sampling chambers 102 nine in the illustrated example share the same pressure source 108 that is pressure source 108 is in communication with each of the multiple sampling chambers 102 this feature provides enhanced convenience speed economy and safety in the fluid sampling operation in addition to sharing a common pressure source downhole the multiple sampling chambers 102 of fluid sampler 100 can also share a common pressure source on the surface specifically once all the samples are obtained and pressurized downhole fluid sampler 100 is retrieved to the surface even though certain cooling of the samples will take place the common pressure source maintains the samples at a suitable pressure to prevent any phase change degradation once on the surface the sample may remain in the multiple sampling chambers 102 for a considerable time during which temperature conditions may fluctuate accordingly a surface pressure source such a compressor or a pump may be used to supercharge the sampling chambers 102 this supercharging process allows multiple sampling chambers 102 to be further pressurized at the same time with sampling chambers 102 remaining in carrier 104 or after sampling chambers 102 have been removed from carrier 104 note that although actuator 106 is described above as being configured to permit separate actuation of three groups of sampling chambers 102 with each group including three of the sampling chambers 102 it will be appreciated that.