Fluke Calibration

5901 Triple Point of Water Cells

Easy-to-use, inexpensive primary temperature standards with uncertainty better than +/- 0.0001C

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$1,863.00 CAD
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The triple point of water (TPW) is not only the most accurate and fundamental temperature standard available, it’s also one of the least expensive and simplest to use.

Triple point of water cells fill four critical purposes. First, they provide the most reliable way to identify unacceptable thermometer drift between calibrations—including immediately after a calibration if the thermometer has been shipped. Interim checks are critical for maintaining confidence in thermometer readings between calibrations. Second, they provide a critical calibration point with unequaled uncertainties.

Third, for users who characterize probes using ratios (that is, they use the ratios of the resistances at various ITS-90 fixed points to the resistance of the thermometer at the triple point of water, indicated by “W"), interim checks at the triple point of water allow for quick and easy updates to the characterizations of critical thermometer standards, which can be used to extend calibration intervals.

And lastly, the triple point of water is where the practical temperature scale (ITS-90) and the thermodynamic temperature scale meet, since the triple point of water is assigned the value 273.16 K (0.01°C) by the ITS-90 and the Kelvin is defined as 1/273.16 of the thermodynamic temperature of the triple point of water.

Good triple point of water cells contain only pure water and pure water vapor. (There is almost no residual air left in them.) When a portion of the water is frozen correctly and water coexists within the cell in its three phases, the “triple point of water" is realized. Fluke Calibration water cells achieve this temperature with expanded uncertainties of less than 0.0001°C and reproducibilities within 0.00002°C.

• Easy-to-use, inexpensive standard with uncertainty better than +/- 0.0001°C
• Four sizes and two shells (glass and quartz) to choose from
• Isotopic composition of Vienna Standard Mean Ocean Water

Specifications

5901A-G

5901A-Q

5901C-G

5901C-Q

5901D-G

5901D-Q

5901B-G

Expanded
Uncertainty
(k = 2)

< 0.0001°C

< 0.0002°C

Reproducibility

0.00002°C

0.00005°C

Dimensions

50 mm OD
12 mm ID
450 mm long

60 mm OD
13.6 mm ID
420 mm long

60 mm OD
14.4 mm ID
420 mm long

60 mm OD
12 mm ID
420 mm long

30 mm OD
8 mm ID
180 mm long

Immersion Depth
(water surface to
well bottom)

265 mm

118 mm

Material

Borosilicate
Glass

Fused
Silica
(Quartz)

Borosilicate
Glass

Fused
Silica
(Quartz)

Borosilicate
Glass

Fused
Silica
(Quartz)

Borosilicate
Glass

Water Source

Ocean

dDVSMOW

+/- 10‰ (+/- 1%)

+/- 20‰

d18OVSMOW

+/- 1.5‰ (+/- 0.15%)

+/- 3‰

Effect of
deviation from
VSMOW

+/- 7 µK

+/- 14 µK

Item
Description
Availability
Price
Brushings for the 5901 triple point of water cells
Normally ships in 1-2 Weeks
Starting At
$277.00 CAD
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"Quick Stick" immersion freezer for the 5901 triple point of water cells
In Stock
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800-567-8686
Isotopic Composition Analysis, TPW Cell for the 5901 triple point of water cells
Normally ships in 1-2 Weeks
$1,476.00 CAD
Water sample, TPW cell for the 5901 triple point of water cells (comes in a sealed glass ampoule)
Normally ships in 1-2 Weeks
$807.00 CAD