Standards and calibration facilities for reactive gases

Project Description

The objective of this project is evaluating progress in the development and realisation of standards and calibration facilities for reactive gases.
Both Nmi and NPL are working on realisation of facilities for calibration gases for hydrogen sulphide, hydrogen chloride and low NOx.

This project aims to compare the institutes Primary standards gas mixtures to safeguard international comparability and traceability.

The composition range of the gas mixtures :

H2S5 exp -6 _ 20 exp -6 mol/mol
NO/NO20,5 exp -6 _ 100 exp -6 mol/mol
HCl30 exp -6 _ 300 exp -6 mol/mol

Final Report 2005-12-01

Since the start of the project (December 1999) a number of cylinders have been compared for both NO and H2S. The results are presented in the following table:

NO in N2

Cylinder
Number
Xanalytical
[µmol/mol]
Xgrav
[µmol/mol]
(Xgrav.-Xanalytical)
[µmol/mol]
U(Xgrav.-Xanalytical)
[µmol/mol]
NPL102010.01±0.089.965±0.05-0.0450.094
NPL10210.986±0.0130.9816±0.010-0.00440.0164
NMi36350.494±0.0100.5003±0.00750.00630.0125
NMi626910.08±0.1010.01±0.10-0.0700.141

 

NMi coded cylinders were prepared by NMi and analysed by NPL;

NPL coded cylinders were prepared by NPL and analysed by NMi.

 

H2S in N2

Cylinder
Number
Xanalytical
[µmol/mol]
Xgrav
[µmol/mol]
(Xgrav.-Xanalytical)
[µmol/mol]
U(Xgrav.-Xanalytical)
[µmol/mol]
NMi515410.03±0.1010.00±0.15-0.030.18
NPLH22010.11±0.1010.19±0.050.080.11
Subjects
Metrology in Chemistry (MC)
Coordinator
Ed de Leer, VSL (The Netherlands)
Phone: +31 152 69 1500
Fax: +31 152 61 2971
E-Mail: edeleer@nmi.nl
Coordinating Institute
VSL (Netherlands)
Participating Partners
NPL (United Kingdom)