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Triple Point of Water Maintenance Apparatus

Triple Point of Water Maintenance Apparatus

TPW Maintenance Apparatus    Model 9210

Easy realization and maintenance of TPW

Total uncertainty better than ±0.0005°C

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Specifications

Temperature Range

–10°C to 125°C

Ambient Operating Range

5°C to 45°C

Cell Maintenance Time

6–10 hours, typical

Stability

±0.02°C

Resolution

0.01° (0.001° in program mode)

Display Scale

°C or °F, switchable

Pre-Cool Wells

3 wells (for 3.18, 6.35, or 7.01 mm probes)

Immersion Depth

6.5" (165 mm) in comparison block

Comparison Block

Three multi-hole blocks, blanks, and custom blocks available

Display Accuracy

±0.25°C

Well-to-Well Gradient

±0.02°C

Fault Protection

Adjustable software cutout using control probe, separate circuit thermocouple cutout for maximum instrument temperature

Cooling Time

Ambient to –5°C: 25 min.

Heating Time

Ambient to 100°C: 45 min.

Communications

RS-232 included

Power

100–230 VAC (±10%), 50–60 Hz

Exterior Dimensions

8.75" W x 10.25" D x 19.25" H (22 x 26 x 49 cm)

Weight

15.5 lb. (7 kg) with block

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 new Model 9210 TPW Maintenance Apparatus provides built-in programming for the simple supercool-and-shake realization and maintenance of our Model 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 7-inch depths.

Use our Feedback Form for more information, to request a catalog or for a Price Quote