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Hart Scientific 9260 - Mini Fixed-Point Furnace (50 °C to 680 °C )

Hart Scientific 9260 - Mini Fixed-Point Furnace (50 °C to 680 °C  )

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  • Good introduction to fixed-point calibration

  • User friendly and inexpensive

Hart’s 9260 Mini Fixed-Point Cell Furnace provides a fixed-point system that cuts in half the financial investment required to do fixed-point calibrations and virtually all the time and training required by traditional systems. 

This furnace costs less than half of a large furnace and works with indium, tin, zinc, and aluminum cells to cover all ITS-90 fixed points from 156.5985 °C to 660.323 °C. The cells themselves, using a smaller volume of 99.9999 % pure metal, also cost much less. But cost is only a part of the issue. 

The 9260 makes using fixed points easy. Simply insert the cell at the end of the day and let it sit overnight. The next morning, initialize the built-in software routine for your specific cell. Come back in an hour, verify the stability of the cell, and you can take measurements for the rest of the day from a near-perfect temperature source! 

The built-in software lets you choose between using melting-point curves or freezing-point curves for each metal. The ITS-90 calls for freezing points, but melting points are easier to realize, and the difference in uncertainty (less than 2 mK for most applications) is generally insignificant. In fact, the difference between using traditional cells at their freezing points and Hart’s mini cells at their melting points is not significant for most labs in most applications. 

Comparison blocks are also available for the 9260 for high-precision comparison calibrations at high temperatures. Two blocks are available with a variety of pre-drilled wells in addition to blank or custom blocks. Well depth is 229 mm (9 in). 

Specifications 

Temperature Range 

50 °C to 680 °C 

Ambient Operating Range 

5 °C to 45 °C 

Stability 

±0.03 °C to 300 °C 

±0.05 °C above 300 °C 

Vertical Gradient 

Top and bottom zones adjustable by offset 

Plateau Duration 

6–10 hours typical 

Resolution 

0.01 ° 

Display Scale 

 °C or  °F, switchable 

Immersion Depth 

229 mm (9 in) 

Stabilization Time 

15 minutes nominal 

Preheat Wells 

Fault Protection 

Sensor burnout and short protection, over-temperature thermal cutout 

Display Accuracy 

±0.2 °C to 300 °C
±0.3 °C to 450 °C
±0.5 °C to 680 °C 

Comparison Block 

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

Well-to-Well Gradient (in comparison block) 

±0.02 °C 

Heating Time 

1.25 hrs. from 25 °C to 680 °C 

Cooling Time 

10.5 hrs. from 680 °C to 100 °C 

Comm. 

RS-232 included 

Power Requirements 

115 VAC (±10 %), 60 Hz, 11 A, or
230 VAC (±10 %), 50 Hz, 6 A, specify, 1200 W 

Exterior Dimensions
(HxWxD) 

489 x 222 x 260 mm
(19.25 x 8.75 x 10.25 in) 

Weight 

20.5 kg (45 lb.) with block 

Ordering Information

9260 

Mini Fixed-Point Furnace 

5914A 

Mini Quartz Indium Cell 

5915A 

Mini Quartz Tin Cell 

5916A 

Mini Quartz Zinc Cell 

5917A 

Mini Quartz Aluminum Cell 

5944 

Metal Cased Mini Indium Cell 

5945 

Metal Cased Mini Tin Cell 

5946 

Metal Cased Mini Zinc Cell 

5947 Metal Cased Mini Aluminum Cell

2940-9260 

Container, Mini-Cell Support, 9260 

2942-9260 

Container, SST Mini-Cell Support, 9260 

1904-X 

Accredited Cell Intercomparison 

3160-1 

Comparison Insert, Blank 

3160-2 

Comparison Insert, 7 holes at 6.35 mm (1/4 in) 

3160-3 

Comparison Insert, 2 holes at 3.2 mm (1/8 in), 2 at 4.76 mm (3/16 in), 2 at 6.35 mm (1/4 in), 2 at 9 mm (9/32 in), and 2 at 9.5 mm (3/8 in) 

 

Call for other comparison insert options. 





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