| 摘要 |
The invention relates to a method for cleaning a system, comprising conducting through a cleaning composition which comprises at least one oxidizing agent and conducting through an indicator composition for detecting the cleanliness state of the system by way of observation of a colour change of the indicator composition, to which end colour values are determined at one or more points and are compared with a setpoint value, with the characterizing part that: a cleaning composition which contains a colour indicator is used, which cleaning composition is conducted continuously through the system; the colour values F of the composition are determined at fixed time intervals after the exit thereof from the system; differences ΔF are formed from two colour values which follow one another; colour values are determined before commissioning of the clean system until the difference ΔF=0, after which the colour value measured last is defined as an inherent system value FA and a maximum tolerable deviation from said value is fixed as a setpoint value ΔFA for cleaning; and the cleaning of the system is carried out after operation thereof until a difference of ≤ ΔFA is measured. |
