ISO 08655-1:2002 pdf download

ISO 08655-1:2002 pdf download.Piston-operated volumetric apparatus一
Part 1: Terminology, general requirements and user recommendations.
3 Terms and definitions
For the purposes of this part of ISO 8655, the following terms and definitions apply.
3.1 Metrological terms
3.1.1
maximum permissible error
upper or lower permitted extreme value for the deviation of the dispensed volume from the nominal volume (3.1.5) or selected volume (3.1.6) of a piston-operated volumetric apparatus
NOTE 1 A general definition for maximum permissible error is given in the VIM.
NOTE 2 The maximum permissible errors of piston-operated volumetric apparatus are specified in ISO 8655-2 to ISO 8655-5. Conformity testing for observance of maximum permissible errors is performed gravimetrically in accordance with ISO 8655-6.
3.1.2
systematic error
(piston-operated volumetric apparatus> difference between the dispensed volume and the nominal volume or selected volume of the piston-operated volumetric apparatus
NOTE 1 General definitions for systematic error are given in the VIM and ISO 3534-1.
NOTE 2 For conformity testing in accordance with ISO 8655-6, the systematic error is ascertained by taking the mean of 10 measurements.
3.1.3
random error
(piston-operated volumetric apparatus> scatter of the dispensed volumes around the mean of the dispensed volumes
NOTE 1 General definitions for random error are given in the VIM and ISO 3534-1.
NOTE 2 For conformity testing in accordance with ISO 8655-6, the random error is ascertained by taking the repeatability standard deviation of 10 measurements.
3.1.4
uncertainty of measurement
(volume dispensed by a piston-operated apparatus) parameter, associated with the dispensed volume, that characterizes the dispersion of the volumes that could reasonably be attributed to the dispensed volume
NOTE 1 Adapted from the VIM.
NOTE 2 The uncertainty of measurement comprises portions of the systematic and random error of measurement. The calculation of the uncertainty of measurement can be performed with the equation given in annex B of ISO 8655-6:2002.
3.1.5
nominal volume
(piston-operated volumetric apparatus) volume specified by the manufacturer and used for identification and for indication of the measuring range
NOTE For specific piston-operated volumetric apparatus such as variable-volume piston pipettes and multi-channel piston pipettes, this definition is further qualified in the applicable parts of ISO 8655.
3.1.6
selected volume
(variable-volume volumetric apparatus) volume set by the user, in order to dispense a volume chosen from the useful volume range (3.1.7) of a variable-volume piston-operated volumetric apparatus
NOTE For a fixed-volume piston-operated volumetric apparatus, the selected volume is equal to the nominal volume.
3.1.7
useful volume range
that part of the nominal volume which allows dispensing under observance of the maximum permissible errors as specified in the applicable part of ISO 8655
NOTE 1 The upper limit of the useful volume range is always the nominal volume. The lower limit is 10% of the nominal volume if not otherwise specified by the supplier.
NOTE 2 For piston-operated burettes, provision may be made in the design for the burette to be recharged automatically (involving more than one stroke of the piston) before the required volume has been dispensed.
3.1.8
dead air volume
(piston-operated pipettes with air interface) air volume between the lower part of the piston and the surface of the liquid
3.1.9
dead liquid volume
(positive displacement pipettes, burettes, dilutors and dispensers) amount of liquid which does not belong to the dispensed volume and which is contained during operation in aspiration or expelling tubes, valves and within the cylinder
3.1.10
adjustment
(piston-operated volumetric apparatus) manufacture of an apparatus within appropriate tolerances, or the supplier’s setting of the apparatus, ensuring the metrological performance, as specified in the applicable part of ISO 8655, for a reference temperature of 20 °C
3.1.11
user adjustment
(piston-operated pipette> adjustment employing only the means at the disposal of the user
NOTE 1 Adapted from the VIM.
NOTE 2 Adjustment requires operations which modify the apparatus for subsequent measurements.
3.1.12
calibration
(piston-operated volumetric apparatus) set of operations that establish the relationship between the dispensed volume and the corresponding nominal or selected volume of the apparatus
NOTE 1 Adapted from the VIM.
NOTE 2 The result of a calibration permits the determination of correction values of the dispensed volume and its associated expanded uncertainty, e.g. following an adjustment or user adjustment.
NOTE 3 The result of a calibration may be recorded in a document called a calibration certificate or a calibration report.
NOTE 4 Calibration requires no operation which permanently modifies the apparatus.
3.2 Terms related to testing
3.2.1
conformity testing
(piston-operated volumetric apparatus> systematic examination to determine whether the requirements specified in this International Standard, especially in a metrological sense, are fulfilled
NOTE 1 Adapted from ISO/IEC Guide 2.
NOTE 2 The corresponding test methods are specified in the applicable part of ISO 8655.