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Primary Temperature Standards

The defining instruments of the ITS-90 (International Temperature Scale of 1990) are Standard Platinum Resistance Thermometers (SPRT) and ITS-90 fixed point cells. SPRTs are calibrated in fixed point cells to provide the highest possible temperature accuracy. Primary standards offered by Fluke’s Hart Scientific division include Standard Platinum Resistance Thermometers, ITS-90 fixed point cells and all of the equipment and services necessary for calibration traceable to the ITS-90, including, furnaces, baths, resistance bridges, and standard resistors.

Standard Platinum Resistance Thermometers (SPRTs)
Model	R TPW	Range
5681	25.5 W	–200 °C to 670 °C
5683	25.5 W	–200 °C to 480 °C
5684	0.25 W	0 °C to 1070 °C
5685	2.5 W	0 °C to 1070 °C
5698	25.5 W	–200 °C to 670 °C
5699	25.5 W	–200 °C to 670 °C
5686	25.5 W	–260 °C to 232 °C

ITS-90 Fixed-point cells
Model	Description	Temperature
5901A-G	TPW Cell, 12 mm ID with handle, glass shell	0.01 °C
5901A-Q	TPW Cell, 12 mm ID with handle, quartz shell	0.01 °C
5901C-G	TPW Cell, 13.6 mm ID with handle, glass shell	0.01 °C
5901C-Q	TPW Cell, 13.6 mm ID with handle, quartz shell	0.01 °C
5901D-G	TPW Cell, 12 mm ID, glass shell	0.01 °C
5901D-Q	TPW Cell, 12 mm ID, quartz shell	0.01 °C
5901B-G	TPW Cell, mini, glass shell	0.01 °C
5900	TP Mercury, SST	–38.8344 °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
5927A	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
5943	Melting Point of Gallium, SST	29.7646 °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, Metal Cased	156.5985 °C
5945	Mini Freezing Point of Tin, Metal Cased	231.928 °C
5946	Mini Freezing Point of Zinc, Metal Cased	419.527 °C
5947	Mini Freezing Point of Aluminum, Metal Cased	660.323 °C

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Standard Platinum Resistance Thermometers (SPRTs)

ITS-90 Fixed-point cells