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Mini Fixed-Point Cells

Mini Fixed-Point Cells
Mini Fixed-Point Cells
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  • Highlights
  • Description
  • Specifications
  • Models and Accessories
  • Knowledge and Information

Least expensive, easiest-to-use fixed-point standards

  • 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, Fluke Calibration'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. 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. 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 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 Fluke Calibration's in-depth training classes held in our lab in Utah.

Specifications
Model
Number
Fixed-
Point
Temperature
( °C)
Outside
Diameter
Inside
Diameter
Total
Cell
Height
Immersion
Depth1
Cell
Only2
Simple
Realization2
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
5947 Aluminum F.P. 660.323 41.3 mm 7.8 mm 222 mm 156 mm 2.0 4.0

Uncertainty (mK) k=2

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.

Model Name Description
5901B-G

TPW Cell, mini, glass shell

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

5947

Mini Metal Cased Aluminum Cell

Accessories common to all models:

Accessory Description
2940-9260

Container, Mini-Cell Support, 9260

2942-9260

Container, SST Mini-Cell Support, 9260

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)

1904-In

Accredited Cell Intercomparison, Indium

1904-Sn

Accredited Cell Intercomparison, Tin

1904-Zn

Accredited Cell Intercomparison, Zinc

1904-Al

Accredited Cell Intercomparison, Aluminum

1904-Ag

Accredited Cell Intercomparison, Silver

Product Manuals
application/pdf icon 5901 Series Triple Point of Water Cells User’s Guide (English) (3.22 MB)
application/pdf icon 5901 Series Triple Point of Water Cells User’s Guide (English) (Rus) (3.7 MB)
application/pdf icon 5914A User’s Guide (1.86 MB)
application/pdf icon 5944/5945/5946/5947 Users Guide (1.36 MB)
application/pdf icon 5944/5945/5946/5947 Users Guide (Rus) (1.08 MB)
application/pdf icon 9210 Triple Point of Water Maintenance Apparatus User’s Guide (English) (786.78 KB)
Application Notes
application/pdf icon Why Use a Triple Point of Water? (1.19 MB)
application/pdf icon Principles of Metrology (400.44 KB)
General Calibration / Metrology Topics
application/pdf icon Defining Temperatures of the ITS-90 Poster (3.07 MB)
Papers / Articles
application/pdf icon Having Confidence in Specifications (61 KB)
application/pdf icon Mini Metal-Cased Fixed-Point Cells (287.24 KB)
application/pdf icon Achieving 0.25 mK Uncertainty with an Integrated-Circuit Resistance Thermometer Readout (78.91 KB)
application/pdf icon Demonstrating Competency and Equivalency of Two Commercial SPRT Calibration Facilities (365.33 KB)
application/pdf icon Fixed Points for Secondary Level and Industrial Calibration (496.68 KB)
application/pdf icon New Generation of Fixed Points (246.17 KB)
application/pdf icon Quality Control of Fixed-Point Cells During Manufacturing (131.1 KB)
application/pdf icon Realization of the Freezing Points Of Indium, Tin and Zinc Using Stainless Steel–Cased Cells (199.26 KB)
application/pdf icon Stainless Steel-Cased Fixed-Point Cells and Their Applications (321.73 KB)
application/pdf icon Study of a New Fixed-Point System for Calibration of Short Secondary Platinum Resistance Thermometers (117.78 KB)
application/pdf icon Study of the Influence of Inducing Nucleation on the Performance of the Freezing Temperature Plateau of Metal Fixed-Point Cells (171.94 KB)
Why Use Fluke Calibration Metal Freeze-Point Cells?
application/pdf icon The Impact of the New SI on Industry (948.69 KB)
On-Demand Webinars
Kelvin Redefinition and What It Means for You
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