NPL provides a wide range of reference gas mixtures that can be tailored to suit the needs of multiple industry sectors. Preparation of these bespoke mixtures can however increase lead times. In order to reduce those lead times, NPL has launched a new range of standard gas mixtures which represent compositions that are in the highest demand and in some cases, where stability is good, may be made in advance to further reduce lead times.
Below is the current list of standards mixtures that are available. Each is provided in a 10 litre cylinder with a valve fitted as per the description in the table. Concentration uncertainty and mixture stability are dependent upon the specific mixture composition and specified below for each standard. The make-up gases used are either pure nitrogen or synthetic air which is composed of 79% nitrogen and 21% oxygen.
NPL remains committed to continuing its full range of gas mixtures and if the exact composition is not listed below, please contact us for a more bespoke quotation.
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Breath analysis standards
Standard mixtures of ethanol and acetone in nitrogen or synthetic air are listed below.
|
Mixture
|
Nominal concentrations
|
Uncertainty
|
Stability
|
Valve
|
Order reference
|
|
Ethanol (EtOH) in nitrogen
|
50 ppm
|
0.8%
|
1 year 6 months
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-N50-UKASMRA
|
|
100 ppm
|
0.8%
|
3 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-N100-UKASMRA
|
|
200 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-N200-UKASMRA
|
|
276 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-N276-UKASMRA
|
|
Ethanol (EtOH) in synthetic air
|
54.4 ppm
|
0.8%
|
1 year 6 months
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A54-UKASMRA
|
|
82.3 ppm
|
0.8%
|
2 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A82-UKASMRA
|
|
137 ppm
|
0.8%
|
3 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A137-UKASMRA
|
|
191 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A191-UKASMRA
|
|
245 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A245-UKASMRA
|
|
301 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A301-UKASMRA
|
|
354 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE12-1130-REF-GAS-ETHANOL-A354-UKASMRA
|
|
Acetone (C3H6O) in synthetic air
|
40 ppm
|
2.0%
|
2 years
|
BS341 No. 14
|
QE12-1070-REF-GAS-ACETONE-A40-UKASMRA
|
|
60 ppm
|
2.0%
|
2 years
|
BS341 No. 14
|
QE12-1070-REF-GAS-ACETONE-A60-UKASMRA
|
|
220 ppm
|
2.0%
|
2 years
|
BS341 No. 14
|
QE12-1070-REF-GAS-ACETONE-A220-UKASMRA
|
Emissions monitoring standards
Standard binary mixtures that can be supplied within specific concentration ranges are shown in the table below. Please specify the desired concentration within these bands when ordering.
|
Mixture
|
Nominal concentrations
|
Uncertainty
|
Stability
|
Valve
|
Order reference
|
|
|
|
|
|
|
|
|
Propane (C3H8) in nitrogen
|
10 ppm - 1000 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-1050-REF-GAS-PROPANE-N10RNG-UKASMRA
|
|
Propane (C3H8) in synthetic air
|
10 ppm - 1000 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-1050-REF-GAS-PROPANE-A10RNG-UKASMRA
|
|
Sulphur dioxide (SO2) in nitrogen
|
10 ppm - 49 ppm
|
1.0%
|
2 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-N10RNG-UKASMRA
|
|
50 ppm - 999 ppm
|
0.8%
|
5 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-N50RNG-UKASMRA
|
|
1000 ppm - 5000 ppm
|
0.4%
|
5 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-N1000RNG-UKASMRA
|
|
Sulphur dioxide (SO2) in air
|
10 ppm - 49 ppm
|
1.0%
|
2 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-A10RNG-UKASMRA
|
|
50 ppm - 999 ppm
|
0.8%
|
5 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-A50RNG-UKASMRA
|
|
1000 ppm - 5000 ppm
|
0.4%
|
5 years
|
DIN 477 No.8
|
QE11-2020-REF-GAS-SO2-A1000RNG-UKASMRA
|
|
Carbon monoxide (CO) in nitrogen
|
10 ppm - 3.4%
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2030-REF-GAS-CO-N10RNG-UKASMRA
|
|
3.5% - 10%
|
0.4%
|
5 years
|
BS341 No. 15
|
QE11-2030-REF-GAS-CO-N35PCRNG-UKASMRA
|
|
Carbon dioxide (CO2) in nitrogen
|
10 ppm - 20%
|
0.3% - 0.5%
|
5 years
|
BS341 No. 14
|
QE11-2060-REF-GAS-CO2-N10RNG-UKASMRA
|
|
Carbon dioxide (CO2) in synthetic air
|
100 ppm - 2000 ppm
|
0.3% - 0.5%
|
5 years
|
BS341 No. 14
|
QE11-2060-REF-GAS-CO2-A100RNG-UKASMRA
|
|
Methane (CH4) in nitrogen
|
10 ppm - 2%
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2060-REF-GAS-CH4-N10RNG-UKASMRA
|
|
Methane (CH4) in synthetic air
|
10 ppm - 1000 ppm
|
0.5%
|
5 years
|
BS341 No. 15
|
QE11-2060-REF-GAS-CH4-A10RNG-UKASMRA
|
|
Oxygen (O2) in nitrogen
|
10 ppm - 21%
|
0.3% - 0.5%
|
5 years
|
BS341 No. 14
|
QE11-2070-REF-GAS-O2-N10RNG-UKASMRA
|
|
Hydrogen sulphide (H2S) in nitrogen
|
10 ppm - 500 ppm
|
2% - 3%
|
5 years
|
DIN 477 No.1
|
QE13-1050-REF-GAS-H2S-N10RNG-UKASMRA
|
Additional binary mixtures that are supplied in discrete concentrations are shown in the table below.
|
Mixture
|
Nominal concentrations
|
Uncertainty
|
Stability
|
Valve
|
Order reference
|
|
Nitrogen monoxide (NO) in nitrogen
(Fast turnaround standard)
|
50 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N50FAST-UKASMRA
|
|
Nitrogen monoxide (NO) in nitrogen
|
10 ppm
|
1.0%
|
2 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N10-UKASMRA
|
|
20 ppm
|
1.0%
|
2 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N20-UKASMRA
|
|
25 ppm
|
1.0%
|
2 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N25-UKASMRA
|
|
30 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N30-UKASMRA
|
|
35 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N35-UKASMRA
|
|
45 ppm
|
0.8%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N45-UKASMRA
|
|
70 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N70-UKASMRA
|
|
100 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N100-UKASMRA
|
|
250 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N250-UKASMRA
|
|
500 ppm
|
0.5%
|
5 years
|
BS341 No. 14
|
QE11-2010-REF-GAS-NO-N500-UKASMRA
|
Environmental gas standards
Standard binary mixtures that can be supplied within specific concentration ranges or discrete ones are shown in the table below. Please specify the desired concentration for those with ranges when ordering. Additional notes for these mixtures are shown below the table.
|
Mixture
|
Nominal concentrations
|
Uncertainty
|
Stability
|
Valve
|
Order reference
|
|
6 Component BTEX mixture in nitrogen
|
4 ppb - 10 ppb
|
2% - 3%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-BTEX-N4BRNG-UKASMRA
|
|
100 ppb
|
2% - 3%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-BTEX-N100B-UKASMRA
|
|
200 ppb
|
2% - 3%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-BTEX-N200B-UKASMRA
|
|
30 component ozone precursor mixture in nitrogen
|
4 ppb
|
2% - 5%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-OZP30-N4B-UKASMRA
|
|
5 ppb
|
2% - 5%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-OZP30-N5B-UKASMRA
|
|
100 ppb
|
2% - 5%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-OZP30-N100B-UKASMRA
|
|
200 ppb
|
2% - 5%
|
5 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-OZP30-N200B-UKASMRA
|
|
Benzene in nitrogen
|
1 ppb - 10 ppb
|
2% - 3%
|
2 years
|
DIN 477 No. 1
|
QE12-1030-REF-GAS-BENZENE-N1BRNG-UKASMRA
|
|
20 component mixture for PTR-MS calibration
|
1 ppm (nominal)
|
3% - 10%
|
1 year
|
DIN 477 No. 8
|
QE12-1070-REF-GAS-PTRMS-N1STD-UKAS
|
|
8 component mixture for SIFT-MS calibration
|
2 ppm (nominal)
|
3% - 10%
|
1 year
|
DIN 477 No. 1
|
QE12-1070-REF-GAS-SIFTMS-N1STD-UKAS
|
Notes
- BTEX and Ozone Precursor Mixtures: NPL will certify the total amount fraction of both m-xylene and p-xylene together as separation cannot be achieved.
- PTRMS and SIFT MS Calibration Standard: Each component at nominally at 1 μmol/mol (ppm).
If you would like to order any of these mixtures or have questions about them, please contact us
Contact us