Certificate of CGM
Here you will find an explanation about a VSL certificate issued for calibrated gas mixture.
Certificate of Calibration
Number C2345701.01
Page 1 of 2
Submitted
A cylinder with number 123456.
The cylinder contains a calibrated gas mixture (CGM) of sulfur dioxide in nitrogen.
The cylinder pressure after calibration is 14.5 MPa. Cylinder outlet conforms to UNI
5 specifications.
This section contains a description about the submitted cylinder and its components. The cylinder number is identical to the number that is stamped into the wall of the cylinder, and this is the only connection between the certificate and the gas cilinder. The contents of the cylinder are mentioned, together with the gas pressure. Finally, the valve outlet type of the cylinder is specified.
Calibration method
Composition determined in accordance with ISO 6143:2001 (Gas analysis – Comparison methods for determining and checking the composition of calibration gas mixtures) using Non Dispersive InfraRed spectroscopy.
This section describes the analytical method(s) used for the calibration of the composition.
Date of calibration
12 September 2023 until 14 September 2023.
Here, the date or period of calibration is mentioned.
Result
| Component | Amount fraction [mol/mol] |
Uncertainty [mol/mol] |
| sulfur dioxide | 84.8 × 10-6 | 0.7 × 10-6 |
The reported uncertainty of measurement is based on the standard uncertainty
multiplied by a coverage factor k = 2, which for a normal distribution corresponds
to a coverage probability of approximately 95 %. The standard uncertainty has
been determined in accordance with the GUM ‘Evaluation of measurement data –
Guide to the Expression of Uncertainty in Measurement’.
The amount fraction of each component with its uncertainty is listed here or on a separate page. The section below gives a description of the stated measurement uncertainty. All contributing factors to the uncertainty of the measurement are combined into the standard uncertainty in accordance with GUM ‘Evaluation of measurement data – Guide to the Expression of Uncertainty in Measurement’. The measurement uncertainty is provided as an expanded uncertainty.
Traceability
The results of the calibration services are traceable to primary and/or (inter)nationally accepted measurement standards realised by VSL.
The results on this certificate are traceable to VSL Primary Standards. This means that the result is related (traceable) to VSL’s reference standards. More information is given on the final page.
Delft, 27 September 2023
On behalf of VSL,
The Certificate Committee
All certificates contain an electronic signature to ensure authenticity. The signature is an electronic seal on the document that prohibits making alterations. Any alteration breaks this seal and is shown in the document. More information about the electronic signature can be found here.
Certificate of Calibration
Number C2345701.01
Page 2 of 2
The final page contains information about the accreditation of VSL.
The reported results are consistent with the national designation of VSL, its international acceptance under the CIPM MRA and international accreditation (ILAC/RvA) as mentioned on this page. If identified, only the noted designation or accreditation is valid.
[1] The reported content in this certificate is traceable to the National (Primary) Standards of The Netherlands, which realize units of measurement according to the International System of Units (SI). Measurement traceability is realized according to ILAC policy on Metrological Traceability of Measurement results (ILAC-P10:07/2020) and Acceptable Traceability (RvA-T018-NL/UK, article 3.1).
Van Swinden Laboratorium (VSL) is designated by law as the National Metrology Institute (NMI) of the Netherlands. As such, it provides direct traceability of measurement results to internationally accepted measurement standards. VSL is a signatory member of the Mutual Recognition Arrangement (MRA) of the International Committee of Weights and Measures (CIPM). The existence of mutual confidence in product specifications and product control is of fundamental importance in order to fulfill international, harmonized legislation on trade, quality, health, safety, and the environment. In this respect, standardized and equivalent measurement units and traceability to internationally accepted standards are essential. More information can be found at https://www.vsl.nl/ .
[2] The reported content in this certificate is consistent with the Calibration and Measurement Capability represented in the Key Comparison Database (KCDB) as part of the Mutual Recognition Arrangement (MRA) of the International Committee of Weights and Measures (CIPM).
This certificate is consistent with the calibration and measurement capabilities (CMCs) that are included in Appendix C of the Mutual Recognition Arrangement (CIPM MRA) drawn up by the International Committee for Weights and Measures (CIPM). Under the CIPM MRA, all participating institutes recognize the validity of each other’s calibration and measurement certificates for the quantities, ranges and measurement uncertainties specified in the KCDB (for details https://www.bipm.org/kcdb/). The “CIPM MRA Logo” and this statement attest only to the measurement(s) applied for determining the certified values on the certificate.
[3] The reported content in this certificate is consistent with the RvA scope of accreditation of VSL with identification P002 for producing reference materials against the requirements as laid down in
ISO 17034:2016 and the relevant requirements of the ISO/IEC 17025:2017.
