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 Hart’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.
Hart’s 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.
Specifications
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Temperature Range
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–10 °C to 125 °C
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Ambient Operating Range
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5 °C to 45 °C
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Stability
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±0.02 °C
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Vertical Gradient
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±0.05 °C over 100 mm at 0 °C
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Plateau Duration
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6–10 hours, typical
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Resolution
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0.01 ° (0.001 ° in program mode)
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Display Scale
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°C or °F, switchable
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Immersion Depth
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171 mm (6.75 in) in optional comparison block
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Stabilization Time
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15 minutes nominal
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Preheat Wells
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3 wells (for 3.18, 6.35, or 7.01 mm probes [0.125, 0.25, 0.276 in])
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Fault Protection
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Adjustable software cutout using control probe; separate circuit thermocouple cutout for maximum instrument temperature
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Display Accuracy
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±0.25 °C
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Comparison Block
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Three multi-hole blocks, blanks, and custom blocks available
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Well-to-Well Gradient (in comparison block)
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±0.02 °C
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Heating Time
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Ambient to 100 °C: 45 min.
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Cooling Time
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Ambient to –5 °C: 25 min.
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Comm.
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RS-232 included
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Power Requirements
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115 VAC (±10 %), 60 Hz, 1.5 A, or 230 VAC (±10 %), 50 Hz, 0.75 A, 170 W
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Exterior Dimensions (HxWxD)
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489 x 222 x 260 mm (19.25 x 8.75 x 10.25 in)
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Weight
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7 kg (15.5 lb.) with block
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9210
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Mini TPW Maintenance Apparatus
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5901B
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Mini TPW Cell
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1904-TPW
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Accredited Cell Intercomparison
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3110-1
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Comparison Insert, Blank
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3110-2
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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)
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3110-3
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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)
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3110-4
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Comparison Insert C, 6 holes at 6.35 mm (1/4 in)
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Call for other comparison insert options.
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