9210 Mini Triple Point of Water Maintenance Apparatus

The triple point of water (0.01 °C) is one of the most important temperatures on the ITS-90.


Inexpensive, easy-to-use fixed-point maintenance apparatus

  • Easy preprogrammed realization
  • Inexpensive fixed-point solution
  • Training takes a few hours

If the reason you don’t use fixed-point cells is because they’re too expensive or too difficult to use, you haven’t heard of Fluke Calibration's mini fixed-point apparatus.

The triple point of water (0.01 °C) is one of the most important temperatures on the ITS-90.

Unfortunately, realizing and maintaining triple point of water cells hasn’t always been convenient or cost-effective.

Because ITS-90 calibrations require frequent measurements at the triple point of water, and because the triple point of water is often used as a statistical check against the drift of a temperature standard, it is important to be able to realize and maintain well-constructed triple point of water cells easily.

The Fluke Calibration 9210 TPW Maintenance Apparatus provides built-in programming for the simple supercool-and-shake realization and maintenance of our 5901B Mini TPW Cell. Simply insert the cell, enter the “freeze" mode through the front-panel buttons, have your morning cup of coffee, and when the 9210 audibly alerts you, remove the Mini TPW Cell and give it a shake to initiate freezing a portion of the water. Re-insert the cell, change the program mode to “maintain," and you’ve got 0.01 °C for the rest of the day with uncertainty of only ±0.0005 °C.

Precision-machined thermal blocks can also be used to take advantage of the excellent stability and uniformity of the 9210 for performing comparison calibrations. Multi-hole and custom blocks are available with 178 mm (7 in) depths.





Temperature Range –10 °C to 125 °C
Ambient Operating Range 5 °C to 45 °C
Stability ±0.02 °C
Vertical Gradient ±0.05 °C over 100 mm at 0 °C
Plateau Duration 6–10 hours, typical
Resolution 0.01 ° (0.001 ° in program mode)
Display Scale °C or °F, switchable
Immersion Depth 171 mm (6.75 in) in optional comparison block
Stabilization Time 15 minutes nominal
Preheat Wells 3 wells (for 3.18, 6.35, or 7.01 mm probes [0.125, 0.25, 0.276 in])
Fault Protection Adjustable software cutout using control probe; separate circuit thermocouple cutout for maximum instrument temperature
Display Accuracy ±0.25 °C
Comparison Block Three multi-hole blocks, blanks, and custom blocks available
Well-to-Well Gradient
(in comparison block)
±0.02 °C
Heating Time Ambient to 100 °C: 45 min.
Cooling Time Ambient to –5 °C: 25 min.
Comm. RS-232 included
Power Requirements 115 VAC (±10 %), 60 Hz, 1.5 A, or
230 VAC (±10 %), 50 Hz, 0.75 A, 170 W
Exterior Dimensions (HxWxD) 489 x 222 x 260 mm (19.25 x 8.75 x 10.25 in)
Weight 7 kg (15.5 lb.) with block



Model Name


9210 TPW (5901B-G) Maintenance Apparatus

Accessory Description
3110-1 Comparison Insert, Blank
3110-2 Comparison Insert A, holes at 1.6 mm, 3.2 mm, 4.76 mm, 6.35 mm, 9.5 mm, and 12.7 mm (1/16, 1/8, 3/16, 1/4, 3/8, and 1/2 in)
3110-3 Comparison Insert B, 2 holes at 4.76 mm (3/16 in), 2 at 6.35 mm (1/4 in), and 2 at 9.5 mm (3/8 in).
3110-4 Comparison Insert C, 6 holes at 6.35 mm (1/4 in)
SC1-FPMA Silver Care Plan, 1-yr Extended Warranty, FP Maintenance Apparatuses
SC2-FPMA Silver Care Plan, 2-yr Extended Warranty, FP Maintenance Apparatuses
SC4-FPMA Silver Care Plan, 4-yr Extended Warranty, FP Maintenance Apparatuses
5901B-G Mini TPW Cell
1904-TPW Accredited Cell Intercomparison


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