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Thermometers can be divided into two groups according to the level of knowledge about the physical basis of the underlying thermodynamic laws and quantities. For primary thermometers the measured property of matter is known so well that temperature can be calculated without any unknown quantities. Examples of these are thermometers based on the equation of state of a gas, on the velocity of sound in a gas, on the thermal noise (see Johnson–Nyquist noise) voltage or current of an electrical resistor, and on the angular anisotropy of gamma ray emission of certain radioactive nuclei in a magnetic field.

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Thermometer

Clinical%20thermometer%2038.7.JPG

Thermometers can be divided into two groups according to the level of knowledge about the physical basis of the underlying thermodynamic laws and quantities. For primary thermometers the measured property of matter is known so well that temperature can be calculated without any unknown quantities. Examples of these are thermometers based on the equation of state of a gas, on the velocity of sound in a gas, on the thermal noise (see Johnson–Nyquist noise) voltage or current of an electrical resistor, and on the angular anisotropy of gamma ray emission of certain radioactive nuclei in a magnetic field.

Secondary thermometers are most widely used because of their convenience. Also, they are often much more sensitive than primary ones. For secondary thermometers knowledge of the measured property is not sufficient to allow direct calculation of temperature. They have to be calibrated against a primary thermometer at least at one temperature or at a number of fixed temperatures. Such fixed points, for example, triple points and superconducting transitions, occur reproducibly at the same temperature.

Internationally agreed temperature scales are based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 K to approximately 1358 K (?272.5 °C to 1085 °C).

Early history

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Philo and Hero of Alexandria knew of the principle that certain substances, notably air, expand and contract and described a demonstration in which a closed tube partially filled with air had its end in a container of water. The expansion and contraction of the air caused the position of the water/air interface to move along the tube.

Such a mechanism was later used to show the hotness and coldness of the air with a tube in which the water level is controlled by the expansion and contraction of the air. These air thermometers were developed by Avicenna in the early 11th century, and by several European scientists in the 16th and 17th centuries, notably Galileo Galilei. As a result, devices were shown to produce this effect reliably, and the term thermoscope was adopted because it reflected the changes in sensible heat (the concept of temperature was yet to arise). The difference between a thermoscope and a thermometer is that the latter has a scale. Though Galileo is often said to be the inventor of the thermometer, what he produced was a thermoscope.

Galileo also discovered that objects (glass spheres filled with aqueous alcohol) of slightly different densities would rise and fall, which is nowadays the principle of the Galileo thermometer (shown). Today such thermometers are calibrated to a temperature scale.

Search results for Temperature Sensor

United Electric Controls | Featured Products

... pressure and temperature switches and sensors for process and ... Integrated Circuit temperature sensors. We also have Temperature Sensor Accessories available ...www.ueonline.com/products/fp_tempsensors.htm

Sensors: Temperature

Temperature ... Below is just a sample of our Temperature Sensors. ... 1/16 DIN Proportional or On-Off Temperature Controllers with Dedicated Inputs & Ranges ...www.omega.com/toc_asp/subsectionSC.asp?subsection=N04&bo...

Temperature Sensors and Sealing Glands from Conax Technologies

... Technologies manufactures temperature sensors and sealing gland assemblies for temperature sensing and pressure ... Chamber/Load Sensor Assembly ...www.conaxbuffalo.com/list.aspx?cid=TS

Fairchild Semiconductor - Site Search - Temperature Sensor

Fairchild Semiconductor (NYSE: FCS) is the global leader in power analog and power discrete technologies delivering energy-efficient solutions for all electronic ...www.fairchildsemi.com/sitesearch/fsc.jsp?command=eq&attr...

Sensor Scientific, Inc.

NTC thermistors and RTD assemblies for medical, HVAC, appliance, automotive, and consumer electronics applications.www.sensorsci.com/

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News about Temperature Sensor

Edible Optical Sensors Tantalize Researchers

CommunicationsDirectSensors are used on both wired and wireless networks to monitor everything from air and humidity conditions to stress levels inside building structures and aircraft assemblies. But Tufts University scientists have now developed a unique optical sensor that can be safely consumed by people and animals in order to detect harmful...http://www.communicationsdirectnews.com/do.php/150/32751?199

Infrared Sensors measure temps from -20 to 500°C.

ThomasNetWith response time of 240 msec, PyroEpsilon non-contact temperature sensors provide linear 4-20 mA output representing target temperature plus 4-20 mA input to control sensor's emissivity setting. Model PE21 has 2:1 optics making it suitable for applications where sensor can be mounted close to target, Model PE151 is designed for small/distant targets and has optical resolution of 15:1, while ...http://news.thomasnet.com/fullstory/820944

Dew Point Transmitter controls moisture in processes.

ThomasNetDesigned to promote energy conservation via efficient moisture control, SF Series can be mounted directly into output of dryer and is protected by HDPE disk filter against contamination by particulate matter. Trace moisture sensor has -40 to +60°C dew point measurement range and safely works in pressures to 20 bar. Standard output is temperature-compensated and measured in °C dew point; absolute...http://news.thomasnet.com/fullstory/549771

Sensor System provides EtherNet/IP(TM) and CAN bus interfaces.

ThomasNetSupporting range of automation and research applications, Network Force/Torque (Net F/T) Sensor System measures 6 components of force and torque (Fx, Fy, Fz, Tx, Ty, Tz). It can be connected to LAN for remote operation and monitoring, and has output rates up to 7,000 Hz for 6 axes of measurement over Ethernet using UDP. System features programmable thresholding, built-in status indicators, ...http://news.thomasnet.com/fullstory/820868

Online Tool facilitates sensor signal path development.

ThomasNetRequiring minimal keystrokes, WEBENCH® Sensor Designer enables engineers to move from concept to simulation to prototyping of common sensor solutions used in medical, industrial, and high-end consumer products. Solution specifically matches bridge pressure sensors, photo detector sensors, and thermocouple sensors with PowerWise® energy-efficient op amps and pin-/function-compatible 8-, 10-, 12-,...http://news.thomasnet.com/fullstory/549705

News about Temperature Sensor

News - Cutting Edge

CNET NewsGeoff Stevenson, a mechanical engineer and owner of the biodiesel plane, a modified Diamond DA20-A1, said that he and his brother had to pull their craft from the contest because its air inlet temperature sensor was broken. It wasn't communicating ... http://news.cnet.com/8300-11386_3-76.html?categoryId=9792757

Measure with sub-nanometre resolution

Engineer Live ... systems, the synchronisation of two capaNCDT systems means the target does not require any electrical earthing. The capaNCDT 6500's overall design enables excellent temperature stability of 5ppm/degC for the controller and 11ppm/degC for the sensor. ... http://www.engineerlive.com/articles_designEngineer/?/Aerosp...

Precision air/gas flow measurement

Engineer LiveThe MT91’s flow sensor electronics incorporate a fully temperature-compensated design that is highly stable with almost no drift for excellent repeatability. The sensor assembly is available with flanged, threaded and retractable process ... http://www.engineerlive.com/articles_powerEngineer/?/Mainten...

HD audio codecs optimize capacity of mobile devices

Electronic Engineering TimesIDT said the device carries a temperature sensor that slowly reduces the device's volume if the temperature is raised beyond the specified limitations and gradually brings the volume back to normal as the device cools, unlike the common thermal ... http://www.eetasia.com/ART_8800547320_499501_NP_2ba1da71.HTM

Satellite Data Reveals Extreme Summer Snowmelt In Northern Greenland

Science DailyTheir conclusion is based on an analysis of microwave brightness temperature recorded by the Special Sensor Microwave Imager (SSM/I) onboard the F13 satellite. “Having such extreme melting so far north, where it is usually colder than the southern ... http://www.sciencedaily.com/releases/2008/10/081008114518.ht...

Search results for Temperature Sensor

Measuring Temperature

Thermistors are inexpensive, easily-obtainable temperature sensors. They are easy to use and adaptable. Circuits with thermistors can have reasonable outout voltages - not the ... http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Senso...

Sensor - Wikipedia, the free encyclopedia

A sensor is a device which measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. For example, a mercury thermometer ... http://en.wikipedia.org/wiki/Sensor

Product Details | Temperature@lert - $129 USB Temperature Sensor ...

Temperature@lert - $129 USB Temperature Sensor with Email Alerts. Temperature@lert is the most reliable USB Temperature monitoring device available to protect your servers and ... http://www.temperaturealert.com/product_p/tm-std30.htm

Temperature/Humidity Sensor Revisited : On the SPOT: David G. Simmons

Temperature/Humidity Sensor Revisited Monday Aug 25, 2008. So I’ve blogged about using the Precon Temperature/Humidity sensor before, but it is time, apparently,to re-visit the ... http://blogs.sun.com/davidgs/entry/temperature_humidity_sens...

QKits Electronic Kits: QK145, Serial Temperature Sensor Kit

QK145: Serial Temperature Sensor Kit - This kit is a PC controlled 4 channel temperature meter (deg C or F) using the serial port, a PIC12C509 and 4 x DS18S20. No external power ... http://www.qkits.com/serv/qkits/diy/pages/QK145.asp
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Videos found for Sensor

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SPACE: Atlantis space shuttle launc...

SPACE: Atlantis space shuttle launch postponed after failure of fuel sensorNASA has postponed again the launch of the space shuttle Atlantis after the failure of a fuel sensor. The six crew members had already climbed aboard for the launch before it was...MPEG 4 - Video

A Sun SPOT Demo: Playing with a Dis...

A Sun SPOT Demo: Playing with a Distance SensorA simple demonstration of using a distance sensor.Flash - Video

Oxygen Sensor How it Works

Oxygen Sensor How it WorksOxygen Sensor How it WorksFlash - Video

Textron's Sensor Fuzed Weapon in Op...

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Answers for Temperature S...

mailittomenow

Is there a temperature sensor that needs to be mounted to the collector on the solar panel?

mailittomenowGenerally, a thermister or thermocouple, but you need to look on the specs for the control for what it uses and where it needs to be mounted.
Danny

Where can i find the coolant temperature sensor on a 2004 audi a4?

Dannytry ebay or craigslist. i know the audi dealer charges so much for repairs.
Roldan I

Where is the engine coolant temperature sensor on a Mazda MX3?

Roldan IFollow your upper radiator hose back towards the engine. The hose connects to the thermostat housing. you should see 1 or more sensors/switches screwed into this housing or very close-by. The temp sen...
Khaos

Where do i find the coolant temperature sensor on a 90 honda accord lx?

KhaosOn your 1990 Honda Accord 2.2L FI , the Coolant Temperature Sensor is located: Under hood, passenger side, lower engine area, below distributor, mounted in cylinder head the Temperature Switch is ...
Sean C

what are the symptoms of a bad coolant temperature sensor?

Sean CYes. The coolant temperature sensor adjust the air to fuel ratio depeneding on the temperature of your engine. If it is bad it will run your too rich(to much gas, not enough air) and it will run rough...

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