The UVS1 sterilizer is a compact unit with a high efficiency UVC irradiated in-line flow cell with a modular design and comes with quick-change tube connectors and adapters to allow the passage of any liquid through the unit that requires sterilization. The flow of liquid is axial from one end to the other with the UVC radiating element within having a proprietary design for control efficiency and a safe replacement procedure when necessary. The unit dimensions are approximately 9cm x 7cm x 4cm and is supplied with an adjustable bracket and mounting post for easy positioning within an experimental rig. There is an external low voltage power supply and an optional low noise power adapter for use of the UVS1 in close proximity to electrophysiology rigs.