In-situ technique for checking the calibration of platinum resistance thermometers

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National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service , Hampton, Va, [Springfield, Va
Resistance thermometers -- Calibration., Wind tun
StatementKamran Daryabeigi and Lawrence A. Dillon-Townes.
SeriesNASA technical memorandum -- 89146.
ContributionsDillon-Townes, Lawrence A., Langley Research Center.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL15286192M

Download In-situ technique for checking the calibration of platinum resistance thermometers PDF

Get this from a library. In-situ technique for checking the calibration of platinum resistance thermometers. [Kamran Daryabeigi; Lawrence A Dillon-Townes; Langley Research Center.]. A brief introduction to the meaning of temperature, thermal equilibrium and temperature scales is followed by a general description of methods used for calibrating platinum resistance thermometers.

Thermometry is by far the oldest and simplest thermal analysis technique. It always involves the measurement of temperature and usually the measurement of time. Heating and cooling curves have been used for many years to establish phase diagrams (Fig. 1).Any type of thermometer can be used for measurement.

Stem Conduction and Light Piping in ITS Fixed Point Cell Assemblies At A UKAS Laboratory - J. Tavener & A.

Description In-situ technique for checking the calibration of platinum resistance thermometers PDF

Blundell - Standard Platinum Resistance Thermometers (SPRTs) with length-below-handle of only mm are regularly submitted for calibration at ITS fixed points from ° C to + ° C. The length of the thermometer limits the. Industrial grade platinum resistance thermometers were calibrated in the temperature range from ° C to ° C.

Both wire-wound and thin-film sensor-based thermometers. Omega has everything you need to measure, monitor, and manage temperature. We have a wide selection of parts, equipment, and devices that can help you achieve the objectives your application requires. We have thermal imagers, thermocouple and RTD cable accessories and wire, thermowells and thermometers, and more.

Omega is the company to trust. This is an incomplete list of standards published by the International Electrotechnical Commission (IEC).

The numbers of older IEC standards were converted in by adding ; for example IEC 27 became IEC IEC standards often have multiple sub-part documents; only the main title for the standard is listed here. A thermometer is a device that measures temperature or a temperature gradient.A thermometer has two important elements: (1) a temperature sensor (e.g.

the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical. Full text of "NBS calibration services users guide " See other formats.

Thermometer probes Platinum resistance thermometers (PRTs)Model Range Size Basic Accuracy†Secondary standard PRTX– °C to °C mm x mm (9 in x in)Select from available calibration optionsX– °C to °C mm x mm (12 in x in)X– °C to °C mm x mm (12 in x in.

Particular examples include the standards for platinum resistance thermometers and thermocouples, where there are small differ-ences. As the standards have been revised following the change from the IPTS to the ITS temperature scale, many of the standards have become harmonised.4/5(4). Example The following resistance values of a platinum resistance thermometer were measured at a range of temperatures.

Determine the measurement sensitivity of. Industrial platinum resistance thermometer Noble-metal thermocouples Base-metal thermocouples (book, paper, website, written standard) written standard Calibration of blackbody sources and radiation thermometers Calibration of fixed-point cells for radiation thermometry Jens Stuk; e-mail: @ This banner text can have markup.

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A RTD made from a known material, usually copper, nickel, or platinum, shows resistance at a particular temperature. Following a temperature change, there is a change in resistance and the temperature of the measured reference point can be determined based on the materials’ resistance–temperature : D.J.

Rossouw. Using capsule-type platinum or rhodium–iron resistance thermometers and commercial resistance measuring bridges calibrated traceably to the national standards, the overall uncertainty of the temperature measurement with respect to ITS or the TPW temperature can reach an order of a few tenth of a millikelvin [6, 14, 24].

SPIE Digital Library Proceedings. Proc. SPIERecent Developments in Traceable Dimensional Measurements III, (18 August ); doi: / The RTD operates on the basis of the resistance changes of certain metals, usually platinum or copper, as a function of temperature.

These two metals are the most commonly used because they show a fairly linear increase of resistance with rising temperature.7 "Three wire" and "four wire" RTDs are commonly used to compen- sate for lead.

Device for calibration of the height micrometers and the squareness standards Tae Bong Eom Proc. SPIERecent Developments in Traceable Dimensional Measurements II, pg (20 November ); doi: /   1 INRiM Istituto Nazionale di Ricerca Metrologica, Turin, Italy.

2 NPL National Physical Laboratory, Hampton Road, Teddington, Middlesex, United Cited by: 7. This book presents a highly integrated, step-by-step approach to the design and construction of low-temperature measurement apparatus.

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Details In-situ technique for checking the calibration of platinum resistance thermometers PDF

Review established thermometer guidance 13 for information on the three types of sensors—platinum resistance sensors, thermistors, and thermocouples—used in digital thermometers. Ensure that the thermometer markings are legible and the liquid column or glass case has no break or change.

Measurement and Instrumentation Principles 65 Determination of the frequency at which instruments should be calibrated is dependent upon several factors that require specialist knowledge.

If an instrument is required to measure some quantity and an inaccuracy of š2% is acceptable, then a certain amount of performance degradation can be allowed. Checking the linewidth dimensions expected byone finds from Figure an estimated fabrication capability of 1/5 to 1 nm, which corresponds to only a few interatomic distances for a silicon surface.

Because it is not expected that linewidth fabrication technology will reach this absolute limit bysome as yet unknown sophisticated. Amongst other things, this means regular checking of your reference sensors against Triple Point of Water cells, Melting Point of Gallium cells, etc.

It also means your calibration laboratory is temperature controlled (much like Gary Swift’s proving oven, above), and uses well stirred, insulated and very stable liquid baths. The In-Situ Water Level Meter offers a range of easy to read dip meters0 designed for professionals working in groundwater monitoring sector.

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The satellite datasets are based on measurements made by the most accurate thermometers available – platinum resistance thermometers, which provide an independent verification of the temperature measurements by checking via spaceward mirrors the known temperature of the cosmic background radiation, which is 1% of the freezing point of water.

For use with resistance or thermocouple thermometers principally in heavy duty applications. RTD sensor unit capable of fully automated in-situ self-calibration, imperial measurements. to °F inconel sheath platinum resistance thermometer with high level of .Introduction Resistance in Metals Introduction The effects of temperature on resistance The effects of impurities on resistance Platinum Resistance Thermometers Electrical properties of platinum thermometers Construction of platinum thermometers Standard platinum.Checking and calibration requirements for test apparatus are summarised in Table A, which also includes the maximum intervals between re-calibrations or re-checks.

(3) Pressure systems and sample drainage systems (including volume change indicators) should be checked for leakage before starting each test.