Our quality, your safety.Accredited Test and Calibration LaboratorySpeciality Gases Centre in Hörstel.

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Speciality Gases Practice 4

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They have long been compulsory for measurements in many sectors, and are fast becoming so in more:gas mixtures with compositions determined by accredited procedures. The Westfalen Speciality Gases Centre, located in the Westphalian town of Hörstel (near Osnabrück) has been accredited as a test laboratory since 2006. In the same year the centre also gained accreditation from the German Calibration Service (DKD - Deutscher Kalibrier-dienst) as a calibration laboratory.

The Speciality Gases Centre therefore fulfils the “General Requirements for the Competence of Test and Calibration Laboratories” in accordance with DIN EN ISO/IEC 17025:2005.

In addition to the documented and ongoing controls on workflows already laid out in certification to DIN EN ISO 9001 ff, the accrediting bodies also test the fundamental accuracy of the results of tests and calibrations.

Under (EU) Regulation 765/2008, only a single national accreditation body has been nominated since 1/1/2010. In Germany this is the German Accreditation Body (DAkkS: Deutsche Akkreditierungsstelle). Westfalen AG has been accredited via DAkkS. With this accreditation as a test and calibration laboratory, the Westfalen Speciality Gases Centre has provided evidence of its competence at both the national and international level.

Precisely defined reference values ensure comparability

A standard method for the production of gas mixtures is gravimetry. In other words: the individual components of the mixtures are weighed out. The weights used for this

Accredited Westfalen quality. Speciality Gases Centre in Hörstel.

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The Westfalen Specialty Gases Centre in Hörstel (near Osnabrück)

are regularly checked and certified by authorised weights and measures offices – this was another element validated during the accreditation of the Westfalen Speciality Gases Centre. The manufacturing process in individual countries is governed by the primary standards defined and prepared by the various metrology institutes (for example: PTB/BAM, NPL, NIST, KRISS, VSL). Only the successful comparison of so-called secondary standards with the current primary standard allows the user to align to internationally accepted measures. In this way comparability, traceability and reproducibility are assured.

Consistent quality for high-grade gas mixtures

The accreditation demonstrates our conformance to national and international standards, giving the proof of quality required by DIN EN ISO/IEC 17025.

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Achieving accreditation required validation of the measurement methods in use.

Validation of the analytical systems at the Speciality Gases Centre in Hörstel

The objective of a validation process is to achieve reliable and reproducible results through the suitability of an analysis technique. In other words, the proof and docu-mentation of the reliability of a method. Validation is a quality assurance tool. The validation and the resulting statistical evaluation determine whether the method can be applied. Validation of the methods is a precondition for accreditation. In detail, the accreditations cover the following

Accreditation as a test laboratory

The Speciality Gases Centre analyses the compositions of gas mixtures, i.e the proportions of certain components in the mixture, in accordance with specified procedures (see table 1). The customer receives a certificate setting out the result in accordance with the requirements of DIN EN ISO/IEC 17025: 2005. In addition to the measured values and analytical tolerances, this certificate also indicates the test method used.

Accreditation as a calibration laboratory (DKD)

The accreditation of the Speciality Gases Centre as a calibration laboratory covers various areas (see table 2). The test result is stated in the DKD calibration certificate. In addition to the results of the measurements and the associated uncertainties of measurement, this certificate sets out the calibration procedures used, the measurement conditions and the reference standard. The calibration certificate documents traceability to the national standards. DKD calibration certificates are recognised worldwide in numerous countries whose accrediting institutes have signed up to the multilateral agreement of the European Co-operation for Accreditation (EA) and the International Laboratory Accreditation Cooperation (ILAC).

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The Westfalen accreditation certificate.

Components to be tested Test proceduresNOX ChemiluminescenceCO, CO2, SO2, other sulphurous gases IR and UV spectroscopy

CO, CO2, O2, H2, propane, methane, ethane, n-butane, isobutane, hexane

Gas chromatography

O2 Paramagnetism, electrochemical measurement cellH2O P2O5 cell, dew point mirror hygrometern-butanol, N2O, acetone IR spectroscopy

* Overview of test procedures for gases and gas mixtures in accordance with test laboratory accreditation.

Table 1*

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Test gases in accordance with DKD ac- creditation as a calibration laboratory.

Measurement quantities/ Calibration item

Measurement range/span in 10-2 mol/mol

Measurement con-ditions/procedure

Lowest assignable measurement uncertainty1) Remarks

Binary and ternary gas mixtures

Mole fraction of carbon monoxide*)

0.001 to 20 Nitrogen or Nitrogen/oxygen mixture* as matrix

1 %The uncertainties are valid for the specified mole fractions in a mixture of a compo-nent and the specified matrix gas.

* only outside the ex-zone

Carbon dioxide 0.001 to 100 1 %Propane*) 0.0005 to 1 1 %Nitrogen dioxide 0.001 to 0.5 5 %Sulphur dioxide 0.001 to 1 1 %1-butanol 0.001 to 0.004 5 %1-butanol 0.004 to 0.01 2 %Methane*) 0.001 to 10 1 %Ethane*) 0.01 to 10 1 %n-hexane *) 0.01 to 0.1 1 %n-butane *) 0.01 to 1.5 1 %Isobutane *) 0.01 to 1.5 1 %Hydrogen *) 0.05 to 50 1 %Nitrogen monoxide 0.001 to 1 Nitrogen as matrix 1 %Oxygen 0.05 to 100 1 %

Dinitrogen monoxide (N2O) 0.001 to 0.05 5 %

Acetone 0.01 to 0.2 5 %Multi-component gas mixtures with reactive gases (each combination is permitted provided there are no safety issues)

Mole fractions of propane *)

0.0005 to 1Nitrogen or Nitrogen/oxygen mixture*) as matrix

1 % The uncertainties are valid for the specified mole fractions in a mixture of a compo-nent and the specified matrix gas.

* only outside the ex-zone

Carbon monoxide *) 0.001 to 20 1 %

Carbon dioxide 0.001 to 100 1 %

Sulphur dioxide 0.001 to 1 1 %

Nitrogen monoxide 0.001 to 1Nitrogen as matrix

1 %

Oxygen *) 0.05 to 100 1 %

Multi-component gas mixtures with hydrocarbons (each combination is permitted provided there are no safety issues)Mole fractions of carbon monoxide *)

0.001 to 20

Nitrogen or Nitrogen/oxygen mixture *) as matrixormethane as matrix

1 % The uncertainties are valid for the specified mole fractions in a mixture of multiple components and the matrix gas.

* only outside the ex-zone

Carbon dioxide 0.001 to 100 1 %

Propane *) 0.0005 to 1 1 %

Methane *) 0.001 to 10 1 %

Ethane *) 0.01 to 10 1 %

n-butane *) 0.01 to 1.5 1 %

Isobutane *) 0.01 to 1.5

1) The lowest assignable uncertainties of measurement were established in accordance with DAkkS-DKD-3 (EA-4/02). These are expanded uncertainties of measurement with a coverage probability of 95% and have, unless otherwise stated, a coverage factor of k=2. Uncertainties of measurement without a specified unit are relative values relating to the measurement value, unless otherwise stated.

Table 2

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Measurement quantities/ Calibration item

Measurement range/ span in 10–2 mol/mol

Measurement conditions/ procedure

Lowest assignable measurement uncertainty1) Remarks

Synthetic natural gas mixtures with mole fractions of the following components

Types in accordance with PTB-A 7.63:May 2011- 6H- 6L-11M-11D-16M-17K

Methane as matrix

Helium 2 %Oxygen 2 %Nitrogen 0.8 %Carbon monoxide 2 %

Carbon dioxide 1 %

Hydrogen 2 %Ethane 1 %Ethene 2 %Propane 1 %Propene 2 %Butane 1.5 %Isobutane 1 %

Pentane 2 %

Isopentane 2 %Neopentane 2 %

n-hexane 2 %

1) The lowest assignable measurement uncertainties were established in accordance with DAkkS-DKD-3 (EA-4/02). These are expanded uncertainties of measurement with a coverage probability of 95% and have, unless otherwise stated, a coverage factor of k=2. Uncertainties of measurement without a specified unit are relative values relating to the measurement value, unless otherwise stated.

abbreviations used:

DAkkS-DKD-3 Expression of Measurement Uncertainty in Calibration, Braunschweig, 1. New edition 2010, Deutsche Akkreditierungsstelle GmbH

DIN Deutsches Institut für Normung e.V.EN European standardIEC International Electrotechnical CommissionISO International Organization for Standardization

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