thermal conductivity sensor Articles

  • Calibration of Thermal Conductivity Sensors for Measuring Soil Suction

    The accuracy of suction measurements using thermal conductivity sensors is dependent upon their calibration. Therefore, a calibration study was undertaken by using a modified, commercially available, pressure plate extractor. The experimental setup along with the calibration procedure are described. Typical calibration results are presented. In general, results showed reasonable agreement between ...


    By ASTM International

  • Numerical Modeling of a Thermal Conductivity Matric Suction Sensor

    Thermal conductivity matric suction sensors appear to be a promising device for the measurement of suction in soil. The technique indirectly measures matric suction by measuring the thermal conductivity of a ceramic block. This paper uses both a spherical and a cylindrical porous medium to simulate the heat flow in a thermal conductivity matric suction sensor. It is found that, although the ...


    By ASTM International

  • The Thermal Probe—Measurement of the Thermal Conductivity and Drying Rate of Soil in the Field

    The thermal probe is a metal rod with an internal heating element and temperature sensor. In the field it is pushed into a predrilled hole in otherwise undisturbed soil, and the thermal properties of the soil are estimated from the temperatures recorded at intervals after a constant power is supplied to the heating element. The following are discussed in this paper: the theory behind the methods ...


    By ASTM International

  • LiQuilaz® S05 Thermal Test

    Abstract Optical particle counters such as the LiQuilaz® II S05 from Particle Measuring Systems are used in a variety of environments that may experience fluctuations in ambient temperature. An additional temperature effect comes from the LiQuilaz itself, which generates heat due to warming of its internal components. Particle Measuring Systems tested the LiQuilaz S05 ...


    By Particle Measuring Systems

  • Evaluation of Thermal Performance of Flame-resistant Fabrics Considering Thermal Wave Influence in Human Skin Model

    A thermal wave skin model incorporating surface heat flux from a skin simulant sensor is developed to characterize the thermal performance of flame-resistant (FR) fabrics covering the skin simulant sensor. Comparison of the results of time to 2nd degree skin burn and temperature elevation of skin beneath a layer of fabric obtained from the newly developed thermal wave skin model to the results ...


    By SAGE Publications Ltd

  • Advances in Thermal Dispersion Mass Flow Meters - Part 2 Installation and Flow Calibration

    Abstract Part 1 of this two-part series describes the principle of operation of a new microprocessor-based thermal dispersion mass flow meter that uses four temperature sensing elements in its flow sensor and has a dry velocity sensor. Part 1 shows how this unique system provides automatic management of changes in gas selection, gas temperature, gas pressure, and outside temperature. This ...


    By Sierra Instruments, Inc.

  • Demystifying Thermopile IR Temp Sensors

    Thermopile temperature or temp sensors offer the advantage of non-contact temperature measurement, making them more and more popular over the standard contact-based temperature sensors. Thermopile sensors use infrared (IR) radiation versus conduction for heat transfer, which provides unique solutions that ...

  • Accuracy in temperature sensor response time estimation for new nuclear reactor designs

    One method for measuring the response time of temperature sensors, the plunge test, verifies that the sensor has a suitable response time in the laboratory before installation. However, plunge test results cannot be extrapolated to the response time in an operating plant because response time is affected by multiple factors such as the ratio of internal heat-transfer resistance to the surface ...


    By Inderscience Publishers

  • New Developments in Thermal Dispersion Mass Flow Meters: In-The-Field Compensation for Changes in Natural Gas Composition

    Introduction The flow of natural gas in pipelines is often complicated by changes in the composition of the gas. The method described in this paper solves the problem of variable composition via a new four-temperature mass flow sensor. The new (low sensor feeds its measurements into the algorithms of an advanced mathematical model that includes gas properties in its calculations. The method ...


    By Sierra Instruments, Inc.

  • The quest for the perfect flowmeter

    Gases & Instrumentation had the oppor-tunity to speak with Dr. John G. Olin, Founder and Chairman of the Board of Sierra Instruments about the evolution of thermal mass flow meters and his latest product in this technology. Gases & Instrumentation: You have been engaged in thermal mass flow technology for a number of years. You must have seen a lot of change. ...


    By Sierra Instruments, Inc.

  • Deployment of a Deep Borehole Observatory at the High Lake Project Site, Nunavut, Canada

    Abstract We deployed a deep permafrost observatory in a borehole at the High Lake Project Site (67°22'N, 1I0°50>W), Nunavut, Canada with the aims of (1) investigating the physical and chemical limitations on microbial life within such environments, (2) developing life-detecting technologies for the exploration of life on Mars and (3) constraining the hydrological and thermal ...


    By In-Situ, Inc.

  • Process gas mass flow controllers - An overview

    A mass How controller (MFC) is used 10 control the How of gases in a wide range of microelectronic processes. A well-designed MFC maintains a constant tlow within I percent of the full-scale flow, has a repeatability of 0.2 percent of full scale, and has a response time of 1 second to reach within 2 percent of the desired (command) flow, all of this is in response to any changes in command flow. ...


    By Sierra Instruments, Inc.

  • Aerial Radiation Detection

    In this time of multiple threats to our security: dirty bomb; cyber; shooters in public places; homemade bombs; misinformation; etc. we feel extremely vulnerable; perhaps more vulnerable than ever before. With the advent of Drone technology now available to private citizens, technology previously only held by the military, the opportunity has come to marry Drone Technology with aerial sensors. ...


    By Technical Associates

  • Comparison of in-situ measured ground heat fluxes within a heteorogeneous urban ballast layer

    This study concentrates on measurements of ground heat fluxes within a porous urban ballast layer that were conducted from June to September 2002 at the goods station in Osnabr€uck, Germany. To account for the limitation of accurately installing sensors within the heterogeneous and porous ballast bulk, the heat fluxes were calculated from four different methods to compare their variability, ...


    By Springer

  • Upgrading from Pellistor Gas Sensors to Infrared Technology

    In this article Andy Avenell, Crowcon’s Fixed Systems Product Manager, considers the shift towards infrared (IR) gas sensor technology in the oil and gas industry. Abstract Flammable gases and vapours can present considerable dangers in many industrial applications, none more so than the processes involved in extracting, transporting and processing oil and gas. Fast and reliable ...

  • Hydrogen-cooled electric generators case study

    Application Moisture contamination is measured in the hydrogen gas used to cool large stationary electric generators. Problem Hydrogen is used to cool the bearings and other rotating parts of large stationary electric generators. Hydrogen is the best choice for a cooling gas because of its unique combination of high thermal conductivity and low viscosity. In ...


    By AMETEK Process Instruments

  • Horizontally suspended carbon nanotube bundles patterned on silicon trench sidewalls

    The strong interaction between horizontally aligned carbon nanotubes (CNTs) and the growth substrate has long been impeding the application of CNTs in micro/nano electronics, the shape and dimension of densely packed CNT bundles are also highly desirable in interconnects and sensor applications. In this paper, we report a method to grow horizontally suspended carbon nanotube (HSCNT) bundles ...


    By Inderscience Publishers

  • Sodium chloride as a tracer for hydrodynamic characterization of a shallow maturation pond

    The results of tests with a sodium chloride tracer in a shallow maturation pond in Brazil are presented. The pond – a full-scale effluent treatment unit for around 250 p.e – was 0.80 m deep with a length/width ratio of 4.3:1, and had accumulated sludge for 12 years to about 40% of the total volume. The pond is subject to daily cycles of thermal stratification/destratification, as shown by ...


    By IWA Publishing

  • Lockhead advances cryogenic research - Case Study

    Lockheed Martin researches, designs, manufactures, and integrates advanced technology systems for the U.S. Department of Defense and NASA. Eric Roth, a Lockheed physicist, tests infrared sensors used for positioning systems in deep-space satellites and  super-conducting electronics. These instruments will not function at normal temperatures. Roth uses a cryogenic refrigerator to test that ...


    By Sierra Instruments, Inc.

  • Industrial Heating - Non-contact Temperature Measurement Advances for Aluminium Extrusions

    The amount of aluminum extruded has increased considerably in recent years due to the metal’s wide availability and relatively low cost. Extrusions offer a combination of light weight and excellent thermal and electrical conductivity, along with strength and resistance to corrosion. Aluminum also is commonly alloyed with other metals to ...


    By AMETEK Land

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