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Calibration Gas

Quality Assurance of Calibration Mixtures

Our gas mixtures for filling disposable pressure vessels are produced gravimetrically (by weight) using sensitive modern balances capable of weighing the relatively heavy cylinders to accuracies of +/- 0.1 gm. This equipment allows direct measurement of cylinder content during filling and eliminates potential errors associated with indirect, manometric (pressure bases) mixing techniques. Which are subject to inaccuracies due to temperature gas compressibility's and non-ideal behavior.

The weights used to calibrate the balances are all traceable to national physical laboratory (NPL) and NIST standards which ensures standard gas mixtures are of the highest possible accuracy. High purity precursor gases are used to ensure gravimetric filling calculations hold true.

The certification accuracy of gravimetric mixtures is dependent on the concentration levels of particular components and on molecular weights. Typically, the accuracy for a given concentration is:

Concentration	Certified Accuracy
5 to 10 ppm	Depends on components (typically +/-10%)
10 ppm to 50 ppm	+/-5%
50 ppm to 1%	+/-2%
1% to 10%	+/-2%
10% to 50%	+/-2%

Our non-refillable products are labeled with the nominal concentration requested by customers. We do not use the exact values from the production process. Thus, there is a tolerance which must be applied to this figure, which is typically:

Concentration	Tolerance
10 ppm to 50 ppm	+/-20%
51 ppm to 1%	+/-10%
1% to 10%	+/-10%
10% to 50%	+/-5%

Where analytical work is required to certify minor components, the accuracy is plus or minus +/-2%.

Our non-refillable pressure vessels are filled and supplied in accordance with out ISO 9001 procedures. All incoming materials are checked and inspected for conformance to agreed specifications. All dispatched products are inspected for quality and aesthetics.

Cylinder Specifications

103L Cylinders

	Contents	103L (3.6 cu ft) @ 70°F & 1000 psig
	Dimensions	13.6" x 3.3"
	Water Capacity	1.52 L
	Material	Steel
	Weight	48 oz (3 lb)
	Valve Inlet	5/8" - 18 UNF (C10)
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Non-Reactive Gases

74L Cylinders

	Contents	74L (8.0 cu ft) @ 70°F & 500 psig
	Dimensions	14.25" x 4.25"
	Water Capacity	2.2 L
	Material	Aluminum Alloy
	Weight	2 lb 5 oz
	Valve Inlet	5/8" - 18 UNF (C10)
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Reactive Gases

58L Cylinders

	Contents	58L (2.0 cu ft) @ 70°F & 500 psig
	Dimensions	14.25" x 3.5"
	Water Capacity	1.72 L
	Material	Aluminum Alloy
	Weight	1 lb 12 oz
	Valve Inlet	5/8" - 18 UNF (C10)
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Reactive Gases

34L Aluminum Cylinders

	Contents	34L (1.2 cu ft) @ 70°F & 500 psig
	Dimensions	10.64" x 3.125"
	Water Capacity	0.9 L
	Material	Aluminum Alloy
	Weight	1 lb 14.9 oz
	Valve Inlet	5/8" - 18 UNF (C10)
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Reactive Gases

34L Steel Cylinders

	Contents	34L (1.2 cu ft) @ 70°F & 500 psig
	Dimensions	10.75" x 2.9"
	Water Capacity	0.9 L
	Material	Steel
	Weight	1 lb 8 oz
	Valve Inlet	CGA 600
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Non-Reactive Gases

17L Cylinders

	Contents	17L (0.6 cu ft) @ 70°F & 240 psig
	Dimensions	10.75" x 2.9"
	Water Capacity	1 L
	Material	Steel
	Weight	114 oz
	Valve Inlet	CGA 600
	Transport	UN 1956 Compressed Gas NOS
	Approval	DOT 39
	For	Non-Reactive Gases

Gases Available

The following gases are available from AFC International in single or multigas combinations. We can custom mix certain gases for your requirements. For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com.

Ammonia	Benzene
Butane	Carbon Dioxide
Carbon Monoxide	Chlorine
Ethylene	Ethylene Oxide
Freon	Hexane
Hydrogen	Hydrogen Sulfide
Isobutylene	Methane
Nitric Oxide	Nitrogen
Nitrogen Dioxide	Oxygen
Pentane	Propane
Propylene	Sulfur dioxide
Toluene	Zero Air

Last Revised: 10/4/07