How do I determine the volume values when calibrating gravimetrically?

The measuring values of the analysis scales are multiplied by the correction factor Z (see SOP pipettes). This takes into account the density of the water at the relevant temperature and the relevant air.

What does EN ISO 8655 cover?

ISO 8655 addresses the needs of suppliers, test houses, and users and specifies the general requirements for piston-operated liquid handling devices. It is structured in seven chapters: ISO 8655-1: Terminology, general requirements, and user recommendations ISO 8655-2: Piston pipettes ISO 8655-3: Piston burettes ISO 8655-4: Dilutors ISO 8655-5: Dispensers ISO 8655-6: Gravimetric method for the determination of measurement error ISO 8655-7: Non-gravimetric methods for assessment of equipment performance (titration, photometry)

What do the terms random error and systematic error mean in a pipette calibration?

The systematic error describes the deviation of the dispensed volume from the nominal volume or from the selected volume of the piston stroke device, and is determined by establishing the mean value of (usually) 10 measurements. The random error describes the mean variation of the dispensed volumes from the mean value of the dispensed volumes, and is determined by calculating the repeat standard deviation of (usually) 10 measurements.

Why are the Z factors listed in our SOP different from factors which can be derived from density reference values (of water)?

The Z factor is included in EN ISO 8655-6 and was incorporated into our SOP. As we understand it, it was incorporated in the standard by the Physikalisch Technische Bundesanstalt in Braunschweig. The Z factor describes the density of water at a particular temperature using a 5th degree polynomial. Furthermore, the density of water is corrected by the density of air (derived from air pressure) and a fixed correction value for balances. These corrections are the key reasons for the deviation from density values in various books of tables.

Varipette® 4720 - 大容量移液器

Services (11)

附件 (6)

11 Services

没有预防性维护的ISO 8655

1-通道, pipette calibration service in accordance with manufacturers specifications or if required ISO 8655 series regulations for single-channel pipettes and dispensers

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目录编号 0082000140

ISO 8655包括预防性维护

1-通道, pipette maintenance and calibration service in accordance with manufacturers specifications or if required ISO 8655 series regulations for single-channel pipettes and dispensers

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目录编号 0082000142

3x4，无需预防性维护

1-通道

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目录编号 0082000139

3x4包括预防性维护

1-通道, 移液器维护和校准服务，单道移液器和分液器

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目录编号 0082000141

ISO 8655认证

1-通道, pipette maintenance and calibration service, for single-channel pipettes and dispensers, calibration in accordance with manufacturers specifications or if required ISO 8655 series regulations

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目录编号 0082000234