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Primary
Standards for Temperature Calibration |
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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. |
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Standard Platinum
Resistance Thermometers (SPRTs) |
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Model |
Resistance
TPW |
Range |
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5681 |
25.5Ω |
-200°C to
670°C |
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5683 |
25.5Ω |
-200°C to
480°C |
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5684 |
0.25Ω |
0°C to 1070°C |
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5685 |
2.5Ω |
0°C to 1070°C |
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5686 |
25.5Ω |
-200°C to
232°C |
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5698 |
25.5Ω |
-200°C to
670°C |
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5699 |
25.5Ω |
-200°C to
670°C |
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Triple Point of Water
(TPW) |
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Model |
Temperature |
Description |
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5901A-G |
0.01°C |
TPW Cell, 12mm ID with handle,
quartz shell |
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5901A-Q |
0.01°C |
TPW Cell, 12mm ID with handle,
quartz shell |
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5901C-G |
0.01°C |
TPW Cell, 13.6mm ID with handle,
glass shell |
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5901C-Q |
0.01°C |
TPW Cell, 13.6mm ID with handle,
quartz shell |
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5901D-G |
0.01°C |
TPW Cell, 12mm ID, glass shell |
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5901D-Q |
0.01°C |
TPW Cell, 12mm ID, quartz shell |
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5901B-G |
0.01°C |
TPW Cell, mini, glass shell |
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ITS-90 Fixed-Point Cells |
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Model |
Temperature |
Description |
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5900 |
-38.8344°C |
TP Mercury, SST |
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5904 |
156.5985°C |
Freezing Point of Indium |
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5905 |
231.928°C |
Freezing Point of Tin |
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5906 |
419.527°C |
Freezing Point of Zinc |
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5907 |
660.323°C |
Freezing Point of Aluminium |
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5908 |
961.78°C |
Freezing Point of Silver |
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5909 |
1084.62°C |
Freezing Point of Copper |
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5924 |
156.5985°C |
Freezing Point of Indium |
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5925 |
231.928°C |
Freezing Point of Tin |
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5926 |
419.527°C |
Freezing Point of Zinc |
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5927A-L |
660,323°C |
Open Freezing Point of Aluminium |
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5927A-S |
660,323°C |
Open Freezing Point of Aluminium |
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5928 |
961.78°C |
Open Freezing Point of Silver |
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5929 |
1084.62°C |
Open Freezing Point of Copper |
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5943 |
29.7646°C |
Melting Point of Gallium, SST |
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ITS-90 Mini Fixed-Point Cells |
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Model |
Temperature |
Description |
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5914A |
156.5985°C |
Freezing Point of Indium |
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5915A |
231.928°C |
Freezing Point of Tin |
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5916A |
419.527°C |
Freezing Point of Zinc |
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5917A |
660.323°C |
Freezing Point of Aluminium |
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5918A |
961.78°C |
Freezing Point of Silver |
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5919A |
1084.62°C |
Freezing Point of Copper |
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5944 |
156.5985°C |
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Freezing Point of Indium, |
Metal Cased |
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5945 |
231.928°C |
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Freezing Point of Tin, |
Metal Cased |
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5946 |
419.527°C |
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Freezing Point of Zinc, |
Metal Cased |
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5947 |
660,323°C |
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Open Freezing Point of
Aluminium, |
Metal Cased |
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Maintenance Apparatus for Mini Fixed-Point Cells |
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Model |
Features/Use |
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2031A |
Quick Stick Immersion Freezer
(freeze Triple Point of Water easily) |
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7012 |
Refrigerated
Temperature Calibration Bath
-10°C to 110°C |
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7037 |
Refrigerated Temperature
Calibration Bath -40°C
to 110°C |
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7312 |
Triple Point of Water Maintenance
Bath -5°C
to 110°C |
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7341 |
Deep-Well Compact Temperature
Calibration Bath -45°C
to 150°C |
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9210 |
Triple-Point of Water Maintenance
Apparatus |
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9230 |
Stainless steel gallium cell
maintenance apparatus |
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9260 |
Mini Fixed-Point Cell Furnace, 50°C
to 680°C |
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9114 |
Metrology (Freeze-Point) Furnace, 100°C
to 680°C |
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9115A |
Sodium Heat Pipe (Freeze-Point) Furnace, 550°C
to 1000°C |
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9116A |
Three-Zone Freeze-Point Furnace, 400°C
to 1000°C |
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9117
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Anneals SPRTs, HTPRTs, and
thermocouples to 1100°C. Protects them
against contamination from metal ions. |
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Boiling Point of Liquid
Nitrogen |
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7196 |
Affordable substitute
for a triple point of argon system. Provides for
low-temperature comparison calibrations at approximately -196°C
with uncertainties of 2mK. |
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Resistance Bridge |
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1590 |
1ppm accuracy for
calibration of SPRTs and thermistors |
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5581 |
0.1ppm accuracy for calibration of
standard resistors and SPRTs. 13:1 measurement ratio allows
resolution to 0.001mK. |
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Standard Resistors |
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742A |
Excellent performance
without oil or air baths. Values from 10 ohm to 100 megohm. |
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5430 |
Highest stability oil-filled
resistors (<2ppm/year drift). AC cal uncertainty to 3ppm. |
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