ISO16431:2012定义了方法 为了测量组装的液压流体动力系统中的流体的清洁度， 在系统从生产区放行时验证所需的系统清洁度，以及 如果需要，将系统清洁到所需的清洁度水平。 ISO16431:2012中规定的清理程序并非旨在取代适当的系统冲洗程序；系统冲洗程序参见ISO 23309。此类系统中使用的部件和零件应在组装前清洁；有关指导，请参见ISO 18413。

ISO16431:2012 defines methods

1. to measure the cleanliness of a fluid in an assembled hydraulic fluid power system,
2. to verify a required system cleanliness upon release of the system from the production area, and
3. if needed, to clean the system to the required cleanliness level.

The clean-up procedure specified in ISO16431:2012 is not intended to replace proper system flushing procedures; see ISO 23309 for a system flushing procedure. Components and parts used in such systems should be clean prior to assembly; see ISO 18413 for guidance.