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Hart Scientific 5945 - Mini Metal Cased Tin Cell

Hart Scientific 5945 - Mini Metal Cased Tin Cell

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  • Lower uncertainties than comparison calibrations
  • All ITS-90 fixed points from TPW to copper
  • Reduced equipment and annual recalibration costs

If cuteness were reason enough to buy a product, Hart’s Mini Fixed-Point Cells would win you over easily. But there’s a much better reason to buy them: they give you the least expensive, easiest-to-use fixed-point standards for your lab. 

Mini cells eliminate the need for comparison calibrations. Temperatures of fixed-point cells are constant and intrinsic, so only the electrical parameters of the sensor under calibration need to be read. If you’re calibrating industrial thermometers, thermocouples, or thermistors and want the most accurate calibration possible, these mini cells will give it to you. If you need a wide range of temperatures, mini cells cover the triple point of water (0.01 °C) and every ITS-90 point from indium (156.5985 °C) to copper (1084.62 °C). 

Fixed-points made simple

With mini cells, realization and maintenance are simple. Mini TPW cells can be automatically realized and maintained in our 9210 Maintenance Apparatus (page 30). Realizing the triple point of water takes only five minutes, but the plateaus last all day. 

The realization and maintenance of indium, tin, zinc, and aluminum cells are likewise automated through our 9260 Mini Fixed-Point Cell Furnace (page 32). Work with them at their designated freeze point, or use them at their melting point to simplify the calibration process even further. We published a paper, “The Comparison Between the Freezing Point and Melting Point of Tin,” to help you understand and benefit from the easier procedure of using the melting point of your standard. 

These mini cells are made from the same materials and with the same procedures as their full-size counterparts. In fact, they can achieve nearly the same uncertainty levels as Hart’s traditional fixed-point cells. Probes as short as nine inches work with these cells. The specifications table (at right) gives you the immersion depth and uncertainty for each cell. 

In addition to high-accuracy calibrations of RTDs and PRTs, these cells are perfect for validating the accuracy of SPRTs. If you’re doing comparison calibrations with SPRTs, then you know the importance of occasionally checking their accuracy between their own recalibrations. Because these cells are easy to use and maintain, verification checks are simple and convenient. 

Metal-cased cells

Metal-cased cells can also be used in the 9260 maintenance furnace. Because they use stainless steel cases, these cells are easier to use and transport without risk of breakage. You’ll notice that we have designed the metal cased cells with more immersion depth to give even better uncertainty too! 

You’ll find these cells easier to use than you expect. You can have a free copy of Xumo Li’s paper comparing freeze-point measurements with melting-point measurements, and if you want a high level of training in using metal freeze-point cells, you can attend one of Hart’s in-depth training classes held in our lab in Utah. 

Specifications

      

 

Uncertainty (mK) k=2


Model Number


Fixed-Point


Temperature
( °C)


Outside Diameter

Inside Diameter

Total Cell Height

Immersion Depth1


Cell Only
2

Simple
Realization
2

5901B-G

Water
T. P.

0.01

30 mm

8 mm

170 mm

117 mm

0.2

0.5

5914A

Indium
F. P.

156.5985

43 mm

8 mm

214 mm

140 mm

1.0

2.0

5915A

Tin
F. P.

231.928

43 mm

8 mm

214 mm

140 mm

1.4

3.0

5916A

Zinc
F. P.

419.527

43 mm

8 mm

214 mm

140 mm

1.6

4.0

5917A

Aluminum
F. P.

660.323

43 mm

8 mm

214 mm

140 mm

4.0

10.0

5918A

Silver
F. P.

961.78

43 mm

8 mm

214 mm

140 mm

7.0

n/a

5919A

Copper
F. P.

1084.62

43 mm

8 mm

214 mm

140 mm

15.0

n/a

5944

Indium
F. P.

156.5985

41.3 mm

7.8 mm

222 mm

156 mm

0.7

1.4

5945

Tin
F. P.

231.928

41.3 mm

7.8 mm

222 mm

156 mm

0.8

1.6

5946

Zinc
F. P.

419.527

41.3 mm

7.8 mm

222 mm

156 mm

1.0

2.0

5947Aluminum
F. P.
660.32341.3 mm7.8 mm222 mm156 mm2.04.0
1Distance from the bottom of the central well to the surface of the pure metal.

2“Cell Only” refers to the expanded uncertainty of the cell when realized by traditional methods and maintained using traditional maintenance devices. “Simple Realization” refers to the expanded uncertainty of the cell when realized using practical methods (melting points instead of freezing points or slush ice instead of an ice mantle, for example) and maintained using Hart’s 9210 and 9260 mini cell maintenance apparatus.

 

Ordering Information

5901B-G

Mini Pyrex® Triple Point of Water Cell

5914A

Mini Quartz Indium Cell

5915A

Mini Quartz Tin Cell

5916A

Mini Quartz Zinc Cell

5917A

Mini Quartz Aluminum Cell

5918A

Mini Quartz Silver Cell

5919A

Mini Quartz Copper Cell

5944

Mini Metal Cased Indium Cell

5945

Mini Metal Cased Tin Cell

5946

Mini Metal Cased Zinc Cell

5647Mini Metal Cased Aluminum Cell

9210

Mini TPW Maintenance Apparatus

9260

Mini Fixed-Point Furnace (for In, Sn, Zn, Al cells)





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