BS EN ISO 6141:2015 pdf free

BS EN ISO 6141:2015 pdf free.Gas analysis – Contents of certificates for calibration gas mixtures
Information relevant for the safe handling, transport, and storage should be provided.
NOTE This kind of information is usually given by a safety data sheet (SDS). If further information is required,this may be provided on the calibration gas or gas mixture certificate.
The names of the specified components of the gas mixture shall be given in an unambiguous way that is understood by the customer. It is recommended to name the components in accordance with IUPAC terminology. For the balance gas, a more common name may be used, such as synthetic air.
The contents of all specified components of the gas mixture shall be given.
NOTE It is preferable to express the contents in amount- of-substance or mass fractions, since these quantities are independent of the pressure and the temperature of the gas mixture. If other quantities are used, e.g. mass concentration or volume fraction, it is necessary to specify the conditions (pressure and temperature) for which the stated composition is valid.
For every specified component, it shall be possible to deduce the standard uncertainty from the uncertainty information prov ided.
EXAMPLE The standard uncertainty can be calculated from a stated expanded uncertainty and coverage factor.
The standard uncertainty should include the contributions from all relevant uncertainty sources. The uncertainty sources considered in the evaluation may be specified. The supplier should be ready and able to provide additional information on the evaluation of uncertainty at request of the customer.
For every specified component, the expanded uncertainty of the content shall be stated. The coverage factor used shall be specified. Preferably, the information is supplemented by the assumed probability distribution and the level of coverage.It is recommended to use a coverage factor of 2.
References shall be given, relating the stated contents and uncertainties to International Standard methods.For the components contents specified, the metrological traceability information shall be given, including the used measurement standards or certified reference materials.
The supplier shall specify to the customer, on request, the relevant metrological traceability chains.BS EN ISO 6141 pdf free download.