Selection guides
Primary standards
Standard platinum resistance thermometers (SPRTs)
Model RTPW Description
5681 25.5 –200 °C to 670 °C, quartz sheath
5683 25.5 –200 °C to 480 °C, quartz sheath
5684 0.25 0 °C to 1070 °C, quartz sheath
5685 2.5 0 °C to 1070 °C, quartz sheath
5698 25.5 –200 °C to 670 °C, working standard, quartz sheath
5699 25.5 –200 °C to 670 °C, high temperature, metal sheath
5686 25.5 –260 °C to 232 °C, glass capsule
ITS-90 fixed-point cells
Model Description Temperature
Triple point of water cells
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
Standard size fixed-point cells
5900E 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
Mini triple point of water and fixed-point cells
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
Model Features/use
Maintenance apparatus
7012 Maintains: triple point of water and gallium cells.
Comparisons: –10 °C to 110 °C.
7037 Maintains: triple point of water and gallium cells.
Comparisons: –40 °C to 110 °C.
7312 Maintains: two TPW cells. Compact size, runs quietly.
Comparisons: –5 °C to 110 °C.
7341 Maintains: triple point of mercury cell.
Comparisons: –45 °C to 150 °C.
9210 Maintains: mini triple point of water.
Comparisons: –10 °C to 125 °C.
9230 Maintains: stainless steel gallium cell.
Comparisons: 15 °C to 35 °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.
9115A Maintains: aluminum and silver cells.
Comparisons: 550 °C to 1000 °C.
9116A 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.
Boiling point of liquid nitrogen
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.
Triple point of argon system
5960A Lowest uncertainty for any commercially available triple
point of argon system.
Standard resistors
742A Excellent performance without oil or air baths.
Values from 1 ohm to 19 megohm.
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Temperature calibration
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