TS EN ISO 8655-1

TS EN ISO 8655-1 is the foundational part of the series for piston-operated volumetric apparatus, setting out the common terminology, general characteristics and user recommendations for these devices. It is relevant to instruments such as piston pipettes, piston burettes, dilutors and dispensers, where accurate transfer of small liquid volumes depends on consistent design concepts and correct handling.

How the device family is understood technically

In general technical terms, piston-operated volumetric apparatus works by using a piston to displace a defined volume of liquid, either through an air cushion or by direct displacement depending on the design. That is why shared terminology matters: terms such as fixed volume, adjustable volume, single-channel and multi-channel operation help users and manufacturers describe the same instrument family without ambiguity. The user recommendations are important background guidance for correct selection, operation, tip use, pre-wetting and routine handling, all of which influence practical volume transfer consistency.

What this part does and does not do

This part provides the general framework for piston-operated volumetric apparatus and the vocabulary used with them; detailed performance verification is addressed in other parts of the same series. It should therefore be read as the common reference layer for the family, not as a standalone source for every test method or numerical acceptance limit. In laboratory measurement practice, that shared base is what allows later parts to specify instrument-specific requirements in a consistent way.