Certificate of CRM
Here you will find an explanation about a VSL certificate issued for certified reference materials.
CERTIFICATE
Number C2345601.04
Page 1 of 2
Reference material of ammonia in nitrogen
The title contains the mixture type (reference material), the components and the matrix gas.
Description
Certified reference gas mixture (CRM), cylinder number D123456.
The cylinder contains a mixture of ammonia in nitrogen.
The CRM is contained in a passivated aluminium cylinder. The cylinder has a water
volume of 5 L and is pressurized to 12.4 MPa.
Cylinder outlet conforms to DIN 1 specifications.
This section contains a description of the cylinder and the provided mixture. For primary reference gas mixtures, the result is the gravimetrically determined value, while for certified reference gas mixtures, the result is the analytically determined value. 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 cylinder. The contents of the cylinder are mentioned, followed by the type of cylinder together with the volume and the gas pressure. Finally, the valve outlet type of the cylinder is specified.
Method
Composition determined in accordance with ISO 6143:2001 using Tunable Diode
Laser Spectroscopy (TDLS).
Our primary reference gas mixtures are prepared gravimetrically in accordance with ISO 6142-1:2015. With this preparation method, we can offer mixtures with traceable values for the amount fraction of the requested component(s) together with their guaranteed stability and uncertainty. The method used for the verification of the mixture against VSL’s primary standards is also specified.
For certified reference gas mixtures, the method(s) used to attribute the result of the composition is mentioned.
Result
| Component | Amount fraction [mol/mol] |
Uncertainty [mol/mol] |
| Ammonia | 50.5 × 10-6 | 1.5 × 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, such as the purity of the raw materials, the weighing process and verification of the prepared mixture 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 on this certificate are traceable to VSL Primary Standards.
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. As stated in ISO 6142-1:2015, the metrological traceability of Class I calibration gas mixtures arises from correct determination of the masses added, conversion of the masses to the amounts of substance (taking into account the purity) and verification against independent measurement standards.
Safety information
The cylinder should be handled with care and by experienced personnel in a laboratory environment suitably equipped for the safe handling of gaseous materials.
The cylinder is a pressure container containing the requested gas at high pressure and should therefore be used with care. Besides, the filling may be a hazardous material.
Instructions for use
The gas mixture can be used to validate and/or calibrate analytical methods and equipment.
Do not use the cylinder in case the cylinder pressure is below 1 MPa.
Further instructions regarding the handling of calibration gases can be found in ISO 16664:2017.
This section contains specific information on the intended use of the cylinder.
Expiry date
This certificate is valid until 20 August 2025. After this date, the results stated are no longer guaranteed to be valid.
The expiry date is the date until when VSL can guarantee the result of the measurement. After this date, the result is no longer guaranteed. When the certificate is expired, contact our Sales department for advice on how to treat the gas mixture.
Delft, 26 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
Number C2345601.04
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.
