ISO8655

ISO 8655 is a series of international standards that defines the performance criteria and testing procedures for piston-operated volumetric apparatus. These standards are crucial for ensuring the accuracy and reliability of measurements made with devices such as pipettes, burettes, and dispensers. The ISO 8655 series is divided into several parts, each addressing specific types of volumetric instruments.

Part 1 of ISO 8655 covers general requirements and the principles of operation for these instruments. It establishes the fundamental concepts of volumetric measurements and the factors that influence accuracy. Part 2 focuses on piston-operated pipettes, providing detailed specifications for single-channel and multi-channel pipettes. Part 3 deals with piston-operated burettes, which are used for precise dispensing of variable volumes. Part 4 addresses piston-operated dispensers, designed for delivering fixed or variable volumes. Other parts may cover specific applications or variations of these instruments.

The standards specify testing methods to determine the systematic error (bias) and random error (imprecision) of the apparatus. This typically involves gravimetric or volumetric testing under controlled laboratory conditions. The results of these tests are used to assign accuracy classes or to verify that the instrument meets its stated performance specifications. Manufacturers use ISO 8655 to design, produce, and calibrate their volumetric instruments, and end-users rely on these standards to select appropriate equipment and to ensure the quality of their laboratory measurements. Compliance with ISO 8655 is often a requirement for laboratories seeking accreditation, such as those operating under ISO/IEC 17025.