How does a (Noren) heat pipe work?

A “How They Work” Resource from Noren Products Online  —  A heat pipe consists of a sealed aluminum or copper container whose inner surfaces have a capillary wicking material. Inside the container is a liquid (usually alcohol) under its own pressure, and enters the pores of the capillary material, wetting all internal surfaces. Applying heat at any point along the surface of the heat pipe causes the liquid at that point to boil and enter a vapor state.When that happens, the gas picks up the latent heat of the vaporization. The gas, which then has a higher pressure, moves inside … Continue reading

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

Humidity & Moisture Measurement Webinars

On-Demand from Kahn Instruments: An Introduction to Humidity and Moisture Measurement click here Humidity Measurement Using Chilled Mirror Technology click here Don’t Sweat Moisture Measurement: 10 Easy Solutions click here About Kahn Hygrometers To measure the moisture content of gases passing through its adsorptive systems, Kahn developed an electrolytic hygrometer in the early 1960’s. Incorporating the latest technologies, this product line has been continuously expanded and today includes a wide range of moisture measurement instrumentation equipped with ceramic, aluminum oxide and chilled mirror optical moisture sensors. A common application for the Kahn portable hygrometer is remote monitoring of the water … Continue reading

US National Centers for Environmental Information (NCEI).

Finding Data by Category Online — The demand for high-value environmental data and information has dramatically increased in recent years. To improve their ability to meet that demand, the USA’s former three NOAA data centers The National Climatic Data Center, The National Geophysical Data Center, and The National Oceanographic Data Center, which includes the National Coastal Data Development Center, have merged into the National Centers for Environmental Information (NCEI – www.ncei.noaa.gov/). NCEI is responsible for hosting and providing access to one of the most significant archives on Earth, with comprehensive oceanic, atmospheric, and geophysical data. From the depths of the ocean to 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

New references for high temperature measurements

Summary of work reported for high temperature measurements from NPL 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 … Continue reading

Rotronic’s Humidity Academy

Online  —  The Humidity Academy that was setup by ROTRONIC USA is the way that ROTRONIC have chosen to share their knowledge. Starting with the first topic relating to the theory of relative humidity. They will work chapter through chapter bringing light into the dark or in their language humidity to the drought. The first two chapters are online now and it will be interesting to update this article as the later chapters are added. Chapters What is Humidity? Relative Humidity, Pressure and Temperature The Capacitive Sensor The Wet Bulb/Dry Bulb Technology Summary of Other Technologies Choosing the Right Humidity … Continue reading

About Climate Data at Berkeley Earth

Online — Berkeley Earth (http://berkeleyearth.org) was conceived by Richard and Elizabeth Muller in early 2010 when they found merit in some of the concerns of skeptics. They organized organized a group of scientists to reanalyze the Earth’s surface temperature record, and published their initial findings in 2012. Berkeley Earth became an independent non-profit 501(c)(3) in February 2013. From 2010-2012, Berkeley Earth systematically addressed the five major concerns that global warming skeptics had identified, and did so in a systematic and objective manner. The first four were potential biases from (1) data selection, (2) data adjustment, (3) poor station quality, and … Continue reading

Global Temperatures | Global Warming, is it Real?

Recent International News about Global Warming and a few link errors in our original webpage with this same title, prompted a recast of this page in the new format of this website and fix and amplify it. It seems that only those with the least knowledge of the Climate Change situation seem to be arguing about the basic fact of Global Warming. It is real and to deny it, is, in our opinion, an indication that those who do so, should take the time to learn the real facts, and if necessary the science underlying them.To those who don’t trust … Continue reading

IMPROVING HUMIDITY MEASUREMENTS IN METEOROLOGY

A product with a unique advantage Air humidity and temperature play an important role in meteorology. Highly accurate measurements of these climate parameters form the basis of accurate forecasts and meaningful records. The E+E Elektronik Model EE33 series humidity and temperature sensor is the only one on the market with a double-heated probe. Both the sensor tube and the sensor element are heated. An application note, free for download from their website, tells the rest of the story. You can download it be clicking here. If that does not work, as sometimes happens when organizations “refine” their websites, we have … Continue reading