National Physical Laboratory Video Presentations on Temperature Measurements

  New references for high temperature measurements As a culmination of an eight-year research programme an international collaboration has developed robust reference fixed points, studied their sensitivity to impurities and external conditions and finally measured their melting transition temperature. This talk describes how 100+ measurements made by nine different NMIs have been combined to assign low-uncertainty thermodynamic temperatures to the melting transition of Re-C, Pt-C and Co-C metal-carbon eutectics. At the simplest level, these fixed-points will provide new temperature references for the calibration of pyrometers at temperatures above the freezing point of silver (1234.93 K) and will thus reduce the … Continue reading

The most accurate temperature measurements ever made. Probably.

NPL Lecture by Michael de Podesta It is now 25 years since the establishment of the International Temperature Scale of 1990. The scale has been extremely successful in enabling accurate and consistent temperature measurement around the world. However, it has become clear that the thermodynamic temperature estimates on which ITS-90 is based were in error, even at temperatures close to the triple point of water. The discovery and elucidation of this error is largely due to the development of acoustic thermometry. Over the last decade, the development of combined microwave and acoustic resonators for the measurement of the Boltzmann constant … Continue reading

Wake Frequency Calculator by TempSens Instrument

Plus two additional Calculators An online resource calculator for estimating the Wake Frequency of a thermowell in a flowing stream. According to the website: “TEMPSENS WAKE FREQUENCY CALCULATOR is easy to use and it also ensures that thermowell is designed within the dimensional limits of PTC19.3, 2010. This calculator establishes the practical design considerations for Thermowell installations in power and process piping, which also incorporates the latest theory in the areas of natural frequency, Strouhal frequency, in-line resonance and stress evaluation.” The same webpage provides a Temperature Calculator to convert the Emf (mV)/Ohms generated by thermocouple & RTD to the … Continue reading

New ASTM Standard For Digital Thermometers

ASTM E2877, Guide for Digital Contact Thermometers W. Conshohocken PA, USA — A new ASTM International standard provides a variety of recommendations for the manufacture and selection of digital thermometers. ASTM E2877, Guide for Digital Contact Thermometers, was developed by Subcommittee E20.09 on Digital Contact Thermometers, part of ASTM International Committee E20 on Temperature Measurement. Included in ASTM E2877 is a set of accuracy classes for digital thermometers. These classes pertain to the temperature interval from -200 °C through 500 °C, an interval important for many thermometry applications. In order to qualify for a specific accuracy class, a thermometer must … Continue reading

The Pros & Cons of RTDs & Thermocouples – By Jim Pinto

One useful resource on RTD and Thermocouple sensors was found at Jim Pinto’s Writings section of his website, borrowed from the original article that he wrote for Instruments & Control Magazine in June 2000, at: www.jimpinto.com/writings/tempsensors.html. In the article Jim takes particular care to describe the likely errors that can occur with less-than-perfect cold junction correction in some electronic thermocouple instruments (i.e. signal conditioners, displays, controllers and transmitters) He prefaces his remarks by saying: Resistance temperature detectors and thermocouples can be used for some of the same measurements, but each has strengths and weaknesses that must be carefully matched to … Continue reading

Using a 3-Wire RTD to Reduce Temperature Measurement Errors

Ensure High Accuracy in Your Critical Temperature Measurements CHESTERLAND OH, USA — To prevent inaccurate temperature measurements which can potentially cause disastrous inventory losses, CAS DataLoggers recommends using 3-wire RTDs to customers taking temperature measurements using RTD sensors. These sensors are affordable and easily available for use with our wide inventory of temperature dataloggers, but some users are unaware of this more accurate option. With this in mind, Applications Specialists have put together this brief guide to show the need for 3-wire RTDs. RTD sensors make simple resistance measurements, usually at about 100 ohms, which is a relatively low level … Continue reading

Resistance Thermometry (Continued) (Thermistors) & Pyrometry – Lecture 17

The Ninth Lecture in the 11 Lecture Sub-Series on Temperature Measurement. Also online at youtu.be/7JsnhzojHo0 and NPTEL at: nptel.iitm.ac.in/video.php?subjectId=112106138. Lecturers for these videos are Prof. Shunmugam M. S., Department of Mechanical Engineering , IIT Madras.(email: shun@iitm.ac.in) and.Prof. S.P. Venkateshan, Department of Mechanical Engineering , IIT Madras (email: spv@iitm.ac.in). Numbers after the lecture title indicate the length of the lecture in (hh:mm:ss) format. You can appreciate from the list and times shown, this is about a 50 hour course, equivalent to a substantial opportunity to learn the topics in significant depth. Lectures in this course: 50 – Syllabus: PDF. … Continue reading

Resistance Thermometry (Continued) – Lecture 16

The Eighth Lecture in the 11 Lecture Sub-Series on Temperature Measurement. Also online at youtu.be/JWf70GDo7Rc and NPTEL at: nptel.iitm.ac.in/video.php?subjectId=112106138. Lecturers for these videos are Prof. Shunmugam M. S., Department of Mechanical Engineering , IIT Madras.(email: shun@iitm.ac.in) and.Prof. S.P. Venkateshan, Department of Mechanical Engineering , IIT Madras (email: spv@iitm.ac.in). Numbers after the lecture title indicate the length of the lecture in (hh:mm:ss) format. You can appreciate from the list and times shown, this is about a 50 hour course, equivalent to a substantial opportunity to learn the topics in significant depth. Lectures in this course: 50 – Syllabus: PDF. … Continue reading

Measurement of Transient Temperature and Resistance Thermometry – Lecture 15

The Seventh Lecture in the 11 Lecture Sub-Series on Temperature Measurement. Also online at youtu.be/KgRB6d8erGE and NPTEL at:nptel.iitm.ac.in/video.php?subjectId=112106138. Lecturers for these videos are Prof. Shunmugam M. S., Department of Mechanical Engineering , IIT Madras.(email: shun@iitm.ac.in) and.Prof. S.P. Venkateshan, Department of Mechanical Engineering , IIT Madras (email: spv@iitm.ac.in). Numbers after the lecture title indicate the length of the lecture in (hh:mm:ss) format. You can appreciate from the list and times shown, this is about a 50 hour course, equivalent to a substantial opportunity to learn the topics in significant depth. Lectures in this course: 50 – Syllabus: PDF. … Continue reading

FREE Online Lectures on Industrial Instrumentation

A 40 Hour Video Lecture Series by: Prof. Alok Barua Department of Electrical Engineering IIT Kharagpur, India We have featured several educational video lectures on Temperature Sensors in Prof. Barua’s online course, (Numbers 8, 9 and 7 on Thermocouples, RTDs and Thermistors, respectively) but realize the depth and extent of just this one component of the NPTEL Courses available online for free is something special! Below is a list of the courses available via YouTube and The NPTEL Website in this the Electrical Engineering :: Industrial Instrumentation Series along with his first video lecture in the Series. Forty Lectures online,  … Continue reading