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White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block

White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block

Product catalog summary

Introduction
This document discusses the calculation of total uncertainty in temperature calibration using a dry block. It highlights the components of uncertainty and provides examples of calculations using both internal and external reference sensors.

Temperature Dry Block
A temperature dry block consists of a heatable/coolable metallic block, a controller, and sensors. It is used for temperature calibration and offers advantages over liquid baths, especially at high temperatures due to safety concerns.

EURAMET Guidelines
The EURAMET guideline provides a standardized approach to calibrating dry blocks, covering aspects such as display accuracy, axial and radial uniformity, loading, stability, hysteresis, immersion, and probe clearance.

Uncertainty Components
Uncertainty in temperature calibration with a dry block can arise from:

Display Accuracy: Accuracy of the internal measurement.
Axial Uniformity: Temperature variation along the insert's length.
Radial Uniformity: Temperature variation between insert holes.
Loading Effect: Heat conduction by probes affecting measurements.
Stability Over Time: Consistency of temperature over time.
Immersion: Adequate immersion depth to minimize errors.
Hysteresis: Dependence of temperature on previous exposure.

Using External Reference Sensor
Using an external reference sensor can reduce total uncertainty by providing more accurate temperature measurements. It accounts for axial and radial uniformity, loading effects, and stability over time.

Calculation Examples
Examples are provided for calculating total uncertainty using internal and external measurements at 0°C with the MB155R dry block:

Internal Measurement: Expanded uncertainty is 0.135°C.
External Measurement: Expanded uncertainty is 0.034°C.

The calculations involve combining standard uncertainties and multiplying by two to obtain expanded uncertainty.

Conclusion
The document emphasizes the importance of understanding and calculating uncertainty components in temperature calibration to ensure accurate and reliable measurements.

Catalog excerpts

White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block-1

110680_Wo_KO_05_2011_Um_frz.qxp:100988_Wo_KO_05_2010_Um table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:4.50pt "Arial", sans-serif; } .font1 { font:7.00pt "Arial", sans-serif; } .font2 { font:17.00pt "Arial", sans-serif; } .font3 { font:27.00pt "Arial", sans-serif; } .font4 { font:32.00pt "Arial", sans-serif; } .font5 { font:36.00pt "Arial", sans-serif; } Beamex Calibration White Pape [email protected] Calculating Total Uncertainty of Temprature Calibration with a Dry Block beamex WORLD-CLASS CALIBRATION SOLUTIONS

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White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block-2

110680_Wo_KO_05_2011_Um_frz.qxp:100988_Wo_KO_05_2010_Um table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:8.00pt "Arial", sans-serif; } .font1 { font:10.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } .font3 { font:13.00pt "Arial", sans-serif; } .font4 { font:26.00pt "Arial", sans-serif; } .font5 { font:9.00pt "Times New Roman", serif; } .font6 { font:43.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper Calculating Total Uncertainty of Temprature Calibration with a Dry Block I n Calibration World magazine (Spring/Summer 2011)...

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White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block-3

110680_Wo_KO_05_2011_Um_frz.qxp:100988_Wo_KO_05_2010_Um table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:8.00pt "Arial", sans-serif; } .font1 { font:9.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } .font3 { font:13.00pt "Arial", sans-serif; } .font4 { font:9.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper IAIN PARTS OF THE DRY BLOCK this in mind, a homogenous zone of at least 60 mm is recommended. Radial uniformity - Radial uniformity refers to the variation in temperature between the holes of the insert. Related uncertainty...

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White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block-4

110680_Wo_KO_05_2011_Um_frz.qxp:100988_Wo_KO_05_2010_Um table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:8.00pt "Arial", sans-serif; } .font1 { font:10.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } .font3 { font:13.00pt "Arial", sans-serif; } .font4 { font:9.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper The spcifications for the above uncertainty components should be in the block's specifications. If some component has not been specified, it should be estimated or evaluated. Using an external rf驩rence sensor as reference...

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White Paper- Calculating Total Uncertainty of Temperature Calibration with a Dry Block-5

110680_Wo_KO_05_2011_Um_frz.qxp:100988_Wo_KO_05_2010_Um table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Arial", sans-serif; } .font1 { font:7.00pt "Arial", sans-serif; } .font2 { font:8.00pt "Arial", sans-serif; } .font3 { font:9.00pt "Arial", sans-serif; } .font4 { font:10.00pt "Arial", sans-serif; } .font5 { font:11.00pt "Arial", sans-serif; } .font6 { font:13.00pt "Arial", sans-serif; } BEAMEX Calibration White Paper IALCULATION EXAMPLI ■ There we calculate two total uncertainty examples. One is done using the internal temperature measurement and the...

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