A security system comprising a fluid source (12; 112), a consumption of a unit (14), a pipe section (16), which the fluid source (12; 112) with the consumption of a connecting unit (14), a locking unit (18) in the pipe section (16) and a measuring unit (20) for detecting a concentration of a fluid, whereby the measuring unit (20) is connected with an alarm unit, which is designed to emit an alarm signal if the of the measuring unit (20) detected concentration of a fluid exceeds a predetermined value, characterized in that the measuring unit (20) with the locking unit (18) is designed and connected, the locking unit (18) when said of the measuring unit (20) detected concentration of a fluid exceeds a predetermined value.
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