Hall Associates - Primary Standards

Fixed-Points - Triple Point of Water, Metal Freeze Point Cells, Triple Point of Mercury

Fixed-Point Cells	Model	Description	Temperature
	5901	Triple Point of Water (TPW)	0.01°C
	5901A	TPW, NBS Design	0.01°C
	5901B	Mini Triple Point of Water	0.01°C
	5901C	TPW, 13.6 mm Well	0.01°C
	5903	Melting Point of Gallium	29.7646°C
	5943	Melting Point of Gallium, SST	29.7646°C
	5904	Freezing Point of Indium	156.5985°C
	5905	Freezing Point of Tin	231.928°C
	5906	Freezing Point of Zinc	419.527°C
	5907	Freezing Point of Aluminum	660.323°C
	5908	Freezing Point of Silver	961.78°C
	5909	Freezing Point of Copper	1084.62°C
	5924	Open Freezing Point of Indium	156.5985°C
	5925	Open Freezing Point of Tin	231.928°C
	5926	Open Freezing Point of Zinc	419.527°C
	5927	Open Freezing Point of Aluminum	660.323°C
	5928	Open Freezing Point of Silver	961.78°C
	5929	Open Freezing Point of Copper	1084.62°C
	5901B	Mini Triple Point of Water	0.01°C
	5914A	Mini Freezing Point of Indium	156.5985°C
	5915A	Mini Freezing Point of Tin	231.928°C
	5916A	Mini Freezing Point of Zinc	419.527°C
	5917A	Mini Freezing Point of Aluminum	660.323°C
	5918A	Mini Freezing Point of Silver	961.78°C
	5919A	Mini Freezing Point of Copper	1084.62°C
	5944	Mini Freezing Point of Indium	156.5985°C
	5945	Mini Freezing Point of Tin	231.928°C
	5946	Mini Freezing Point of Zinc	419.527°C
	5931	Triple Point of Water X Cell	0.01°C
	5933	Melting Point of Gallium X Cell	29.7646°C
	5934	Freezing Point of Indium X Cell	156.5985°C
	5900	Triple Point of Mercury	–38.8344°C

Apparatus	Model	Features/Use
	7312	Maintains two TPW cells. Compact size, runs quietly. Comparisons: –5°C to 110°C.
	7012	Maintains: triple point of water and gallium cells. Comparisons: –10°C to 110°C.
	7037	Maintains: triple point of mercury, triple point of water, and gallium cells. Comparisons: –40°C to 110°C.
	9210 9230	Maintains: mini triple point of water and mini gallium cells. Comparisons: –10°C to 125°C.
	9260	Maintains: indium, tin, zinc, and aluminum cells. Comparisons: 50°C to 680°C.
	9114	Maintains: indium, tin, zinc, and aluminum cells. Comparisons: 100°C to 680°C.
	9115	Maintains: aluminum and silver cells. Comparisons: 550°C to 1000°C.
	9116	Maintains: aluminum, silver, gold, and copper cells. Comparisons: 400°C to 1100°C.
	9117	Anneals SPRTs, HTPRTs, and thermocouples to 1100°C. Protects them against contamination from metal ions.
	7196	Affordable substitute for a triple point of argon system. Provides for low-temperature comparison calibrations at approximately –196°C with uncertainties of 2 mK.
	5581	0.1 ppm accuracy for calibration of standard resistors and SPRTs. 13:1 measurement ratio allows resolution to 0.001 mK.
	5420-X	Excellent performance without oil or air baths. Quick connect/disconnect with Hart’s DWF connectors.
	5430-X	Highest stability oil-filled resistors (< 2 ppm/year drift). AC cal uncertainty to 3 ppm.