A fluid processing device for processing fluid, wherein the fluid processing device comprises: a first fluid drive unit configured for driving a first fluid along a first flow path; a second fluid drive unit configured for driving a second fluid along a second flow path; a fluidic switch fluidically coupled to the first flow path and to the second flow path, the first flow path and the second flow path being fluidically decoupled from each other over their entire lengths, except within the fluidic switch, the fluidic switch being configured for being switchable between different fluid switching states for transferring first fluid from the first flow path into the second flow path without interruption of fluid flow along at least one of the first flow path and the second flow path, a first fluid accommodation volume, a second fluid accommodation volume and a third fluid accommodation volume, each of which having fluidic interfaces fluidically coupled to the fluidic switch and being configured for cooperating to maintain a fluid flow independently along the first flow path and along the second flow path via at least one of the fluid accommodation volumes (200, 202, 204) while the fluidic switch is switched for transferring first fluid from the first flow path into the second flow path; wherein the fluidic switch is configured to be switchable in a fluid processing switching state in which the first flow path includes one of the first fluid accommodation volume or the second fluid accommodation volume, while the second flow path includes the respectively other one of the first fluid accommodation volume or the second fluid accommodation volume, while none of the first flow path nor the second flow path includes the third fluid accommodation volume, characterized in that the fluidic switch is configured to be switchable in a first fluid splitting switching state in which the first flow path includes both the first fluid accommodation volume and the second fluid accommodation volume to thereby split first fluid to flow through the first fluid accommodation volume and through the second fluid accommodation volume, while the second flow path includes the third fluid accommodation volume, and the fluidic switch is configured to be switchable in a second fluid splitting switching state in which the first flow path includes the first fluid accommodation volume or the second fluid accommodation volume, while the second flow path includes the respectively other one of the first fluid accommodation volume or the second fluid accommodation volume and includes in addition the third fluid accommodation volume to thereby split second fluid to flow through the other one of the first fluid accommodation volume or the second fluid accommodation volume and in addition through the third fluid accommodation volume. a first fluid drive unit configured for driving a first fluid along a first flow path; a second fluid drive unit configured for driving a second fluid along a second flow path; a fluidic switch fluidically coupled to the first flow path and to the second flow path, the first flow path and the second flow path being fluidically decoupled from each other over their entire lengths, except within the fluidic switch, the fluidic switch being configured for being switchable between different fluid switching states for transferring first fluid from the first flow path into the second flow path without interruption of fluid flow along at least one of the first flow path and the second flow path, a first fluid accommodation volume, a second fluid accommodation volume and a third fluid accommodation volume, each of which having fluidic interfaces fluidically coupled to the fluidic switch and being configured for cooperating to maintain a fluid flow independently along the first flow path and along the second flow path via at least one of the fluid accommodation volumes (200, 202, 204) while the fluidic switch is switched for transferring first fluid from the first flow path into the second flow path; wherein the fluidic switch is configured to be switchable in a fluid processing switching state in which the first flow path includes one of the first fluid accommodation volume or the second fluid accommodation volume, while the second flow path includes the respectively other one of the first fluid accommodation volume or the second fluid accommodation volume, while none of the first flow path nor the second flow path includes the third fluid accommodation volume, characterized in that the fluidic switch is configured to be switchable in a first fluid splitting switching state in which the first flow path includes both the first fluid accommodation volume and the second fluid accommodation volume to thereby split first fluid to flow through the first fluid accommodation volume and through the second fluid accommodation volume, while the second flow path includes the third fluid accommodation volume, and the fluidic switch is configured to be switchable in a second fluid splitting switching state in which the first flow path includes the first fluid accommodation volume or the second fluid accommodation volume, while the second flow path includes the respectively other one of the first fluid accommodation volume or the second fluid accommodation volume and includes in addition the third fluid accommodation volume to thereby split second fluid to flow through the other one of the first fluid accommodation volume or the second fluid accommodation volume and in addition through the third fluid accommodation volume.