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Topic: Resistance Temperature Detector

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	Resistance Temperature Device - Wikipedia, the free encyclopedia
		Resistance temperature detectors operate on the principle of changes in electrical resistance of pure metals and are characterized by an almost linear positive change in resistance with temperature.
		RTDs are able to sense temperatures with extreme repeatability and low drift error from –200°C to +850°C. The temperature coefficient of the RTD element is positive.
		RTD (T) is the resistance of the RTD element at temperature T ºC, RTD0 is the specified resistance of the RTD element at 0ºC and, T is the temperature of the RTD on the environment to be measured in degrees Celsius.
	en.wikipedia.org /wiki/Resistance_Temperature_Device (554 words)

	Resistance Temperature Detector - Wikipedia, the free encyclopedia
		A resistance temperature detector measures the relationship between electrical resistance and temperature.
		The sensitivity is a nominal 0.385 ohm/°C. By far the most common devices used in industry have a nominal resistance of 100 ohms at 0 °C, and are called Pt-100 sensors ('Pt' is the symbol for platinum).
		RTDs in industrial applications are rarely used above 660 °C. At temperatures above 450 °C it becomes increasingly difficult to prevent the platinum from becoming contaminated by impurities from the metal sheath of the thermometer.
	en.wikipedia.org /wiki/Resistance_Temperature_Detector (301 words)

	RTD Elements and RTD Probes - Resistance Temperature Detection Sensors(RTDS)
		Resistance Temperature Detectors (RTD), as the name implies, are sensors used to measure temperature by correlating the resistance of the RTD element with temperature.
		The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.
		A resistance temperature detector operates on the principle of the change in electrical resistance in wire as a function of temperature.
	www.omega.com /rtd.html (564 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		A temperature sensing probe assembly 34 is arranged to extend from a periphery of the heater 2 across the three heating zones 12,14, 16, in the space between the heating elements 18,20, 22 and the cooking plate 10.
		Since the resistance temperature detector 42 is a relatively small discrete component located within the central heating zone 12, it responds primarily to the temperature in the central heating zone 12 and is thermally influenced to a minimal extent by the additional energising of the intermediate and outer heating zones 14 and 16.
		The resistance temperature detector 42 is calibrated in cooperation with the electronic control apparatus 30 such that, when a predetermined temperature is reached in the central heating zone 12, the one or more heating elements 18 is or are arranged to be de-energised and also the heating elements 20 and 22, if these were energised.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/03793.030109&ELEMENT_SET=DECL (2390 words)

	ET408 -- Resistance Temperature Detector (Site not responding. Last check: 2007-10-16)
		The RTD is a passive sensor that varies in resistance with temperature.
		The primary source of error in measuring RTD resistance is the resistance due to the lead wires.
		Due to its inherent stability, the RTD is often used as a secondary calibration standard.
	www.engr.siu.edu /staff1/weston/NSFATE/ET408/B3/Rtd.html (296 words)

	A precision interface for a Resistance Temperature Detector (RTD)
		Resistance Temperature Detectors (RTDs) are temperature sensors that make use of the temperature dependence of a metal's resistance.
		The voltage drop in the wires W1 and W4 are removed from the measurement of the voltage across the RTD.
		The amount of current forced through the RTD is a compromise between maximizing the sensitivity of the temperature sensor and minimizing the self-heating error caused by the current flowing through the RTD.
	www.national.com /nationaledge/dec04/article.html (956 words)

	Resistance Temperature Detectors (RTD’S) Fundamentals (Site not responding. Last check: 2007-10-16)
		The main consideration when installing an RTD element is that there is sufficient immersion to ensure that the RTD is not averaging the temperature of the process and equipment or structure outside the process.
		The most common construction used is to place the RTD element and attached wires into a closed end metal tube, pack the tube with a vibration dampening and/or heat transfer material such as alumina powder, and seal the open end of the tube with an epoxy, silicone, or ceramic cement.
		RTD’s are more expensive than thermocouples because there is more construction required to make the RTD including manufacture of the sensing element, the hooking up of extension wires and assembly of the sensor.
	www.pyrosales.com.au /RTD_fundamentals.asp (2134 words)

	Applications - Resistance Temperature Detectors: Branom Instrument Company
		Resistance temperature detectors (R.T.D.) or resistance thermometry is based on a well-known principle that most metals increase in resistivity when their temperature is increased, and on cooling to the original temperature, will return to the original resistivity.
		Laboratory resistance temperature detectors of pure platinum, fully annealed and strain free, have been chosen as the International Standard of Temperature Measurement from liquid oxygen [(LO2)-182.97 deg C] to the melting point of antimony [(sb) + 630.5 deg C].
		Greatest Accuracy - The pre-eminent position of the resistance thermometer as a precision temperature measuring instrument is demonstrated by its selection to define the International Temperature scale from -260 deg C to +660 deg C. The main reasons for its selection are: 1) the exceptional stability and 2) the repeatability of the resistance thermometer.
	www.branom.com /literature/rtd.html (1137 words)

	Resistance Temperature Detector (RTD) - Engineers Edge (Site not responding. Last check: 2007-10-16)
		Resistance Temperature Detectors (RTD's) incorporates pure metals or certain alloys that increase in resistance as temperature increases and, conversely, decrease in resistance as temperature decreases.
		The coefficient of resistance is the change in resistance per degree change in temperature, usually expressed as a percentage per degree of temperature.
		RTD elements are usually long, spring-like wires surrounded by an insulator and enclosed in a sheath of metal.
	www.engineersedge.com /instrumentation/rtd.htm (403 words)

	AnaLog Services on Temperature Sensors
		RTDs exploit and optimize the tendency of metallic conductors to exhibit a change in resistance with temperature.
		RTDs are available in the newer "thin film" or the older, and increasingly less common, "wire wound" constructions.
		RTDs are made in different resistances, with the resistance usually specified at 0°C (the R
	www.logwell.com /tech/temp/temperature_sensors.html (454 words)

	Sensors Magazine Online - May 2003 - Time to Learn Your RTDs (Site not responding. Last check: 2007-10-16)
		This property is called the metal’s resistivity, and it defines the length and cross-sectional area required to fabricate an RTD of a given value.
		RTDs are constructed of fine wires or thin coatings, and the very small cross-sectional areas in the sensing elements tend to heat when electrical current is applied.
		Resistance temperature detectors, familiar and reliable, are widely used in industry and aerospace.
	www.sensorsmag.com /articles/0503/52/main.shtml (3165 words)

	What makes a Resistance Temperature Detector - RTD - work
		No two different metals have the same alpha and if the properties of the metal are known, a resistance vs. temperature curve may be established which can be accurately duplicated.
		The sensing element of a RTD may consist of a coil, foil or thin film deposited material.
		RTD extension leads may be of any convenient material (typically copper wire with insulation requirements to suit the environment of use) provided all leads are of the same material.
	www.nanmac.com /handbook/i1.htm (297 words)

	thermo electric resistance temperature detector
		Operating on the principle that resistance of any given metal changes with temperature, Thermo Electric RTD's are the sensors of choice in applications where accuracy, stability and repeatability are critical.
		To maximize linearity and temperature ranges, Thermo Electric specializes in the use of high-purity platinum elements.
		Thermo Electric RTD's are available in diverse configurations with two-,three- and fourwire construction ranging from -200°C to 650°C (-328°F to 1202°F).
	www.matco.f2s.com /te/Resistance_Temperature_Detectors.html (105 words)

	Electrical & Electronics Corpn - Projects
		When RTD element is subjected to heat, it changes its electrical resistance value, corresponding to variation in temperature and its thermal coefficient (œ) (Alpha).
		Temperature resistance characteristics conform to DIN 43760 / IEC 751 / BSS 1904 / JIS C1604 standards.
		Conventional thermocouple or RTD elements pass through multi bore insulators, encased in outer protection sheath and connected to temperature measuring instrument.
	www.eecorpn.com /temperature_elemants.htm (240 words)

	Resistance Thermometer Calibration Curves
		Measure the resistance of your thermistor at various known temperatures, or obtain some calibration points from the manufacturer (such as the examples in the file thermis.txt).
		If the temperature span is 50 degrees C or less, the three-coefficient formula will probably be better unless the measured data values are extremely accurate.
		With that definition the computed value of R is the ratio of the resistance at temperature T to the resistance at 25 degrees.
	www.moshier.net /rtd-readme.html (669 words)

	Improving the Accuracy of Temperature Measurements
		Highly accurate temperature measuring equipment is now widely available at very reasonable costs but, whilst this should be making the task of making temperature measurement easy, many users make simple mistakes that negate the benefits of using high specification sensors and measuring equipment.
		This second temperature reading, along with the reading from the thermocouple itself, is used by the measuring instrument to calculate the true temperature at the thermocouple tip.
		Another common type of temperature measuring device is the resistance temperature detector — the most stable and accurate (although expensive and fragile) of the three sensor types discussed in this article.
	www.picotech.com /applications/temperature.html (2708 words)

	Resistance Temperature Detector
		Typical applications are: airducts, bearing temperature, oil temperature indicator, soldering equipment, ovens, environmental test chambers, pharmaceutical mfg., food processing, plastic molding, petroleum & chemical processing, electric generating plants, etc.
		Suggested Specification: Resistance temperature detector probe shall be wire wound platinum with (1/4")(1/8") diameter 316SS sheath, 36 in.
		Temperature Detector shall be Dwyer Model No. RTD-_____-_____.
	www.leightonstone.com /dwyer/temperature/98-31t.html (132 words)

	The educational encyclopedia, temperature sensors (Site not responding. Last check: 2007-10-16)
		NTC thermistors Thermistors are temperature sensitive passive semiconductors which exhibit a large change in electrical resistance when subjected to a relatively minute change in body temperature.
		Temperature sensors LM135, LM235, LM334, LM34, LM35, LM45, LM50, LM56, LM60, LM61, LM62, LM66, LM70, LM74, LM75, LM76, LM77, LM80, LM81, LM82, LM83, LM84, LM87, LM92
		Thermopile detectors thermopile detector output is proportional to incident radiation while the pyroelectric detectors output is proportional to rate of change of incident radiation.
	users.telenet.be /educypedia/electronics/sensorstemp.htm (792 words)

	RTD
		Resistive Temperature Detectors operate on the principle that the electrical resistance of a metal conductor changes as a function of temperature.
		probes consist of a platinum resistance element that is encapsulated and circuited in a mineral insulated, metal sheath construction and terminated by means of a bare wire, quick connectors or terminal heads.
		tolerance class is based on the percent allowable variation, in ohms, of the nominal resistance value at the reference temperature.
	www.jimnel.com /rtd.html (618 words)

	Temperature control (Site not responding. Last check: 2007-10-16)
		Delay of propagation of temperature is one of the causes.
		A thermistor temperature sensor is used as a part of an industrial commodity.
		In trouble of temperature control, there is much case which does not notice deterioration of temperature sensor.
	www.geocities.com /taka63rkc (248 words)

	Application Note: Choosing an RTD (Resistance Temperature Detector), Thermocouple or Thermistor
		The element's resistance increases with temperature in a known and repeatable manner.
		Temperature range: -260 to 850°C (-436 to 1582°F) Repeatability and stability: The platinum resistance thermometer is the primary interpolation instrument used by the National Institute of Standards and Technology(NIST)from -260 to 962°C. Laboratory models stable within 0.0025°C are available.
		A thermistor is a resistive device composed of metal oxides formed into a bead and encapsulate in epoxy or glass.
	www.microdaq.com /accessories/choosing.php (487 words)

	L&J Engineering - MCG-351 Averaging Temperature Probe
		The Resistance Temperature Detector (RTD) measures multiple spot temperatures by outputting a resistance change to a gauge or transmitter.
		This change in resistance, which is directly proportional to temperature, is detected by a precision input bridge circuit in the transmitter.
		The reference lead is used to remove lead wire resistance from the measurement of the temperature elements.
	www.ljtechnologies.com /ljeng/ljemcg351.htm (186 words)

	North American Temperature Sensors & Transmitters Markets
		Manufacturers of temperature sensors and transmitters in North America are likely to witness moderate growth even though they are challenged by the market saturation of many technologies that are in the late stages of their life cycle.
		The detectors convert the IR energy to an electrical signal, which is then converted into a temperature value based on the instrument's internal algorithms and the target's emissivity.
		Transmitter: The temperature transmitter amplifies and linearizes the resistance change of a resistance type temperature-sensing element and converts the signal to a standard 4 to 20 mA output.
	www.frost.com /prod/servlet/report-brochure.pag?id=A309-01-00-00-00 (2562 words)

	Temperature Sensor & Detector - Electronic Sensors & Detectors
		The processor determines—by mathematical calculation or a temperature-indexed look-up table—the amount of adjustment is necessary at a given temperature and delivers the resulting value via a D/A converter....
		Sensing temperature with a silicon junction often exploits the fact that the forward voltage drop has a temperature coefficient of −2.2 mV/°C. The problem with this method is that.
		Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as do automotive-HVAC systems that adjust temperature zones based on the body temperature of passengers...
	www.hobbyprojects.com /S/Temperature.html (1879 words)

	Platinum Resistance Temperature Probes (Site not responding. Last check: 2007-10-16)
		The Resistance Temperature Detector (RTD) is one of the most accurate and stable industrial temperature sensors.
		The most widely accepted RTD is 100-ohm platinum, commonly known as Pt100.
		Platinum RTD's have excellent long term stability between -190° and +800° C. Standard Solomat platinum probes are supplied with 6 feet of cable with high temperature acetal handles unless specified otherwise.
	www.brandtinst.com /solomat/probes/probe6.html (255 words)

	Resistance Temperature Detector (Site not responding. Last check: 2007-10-16)
		Precision RTD (Resistance Temperature Detector) offers excellent accuracy and stability over a wide temperature range.
		Temperature Range: -148 to 392°F (-100 to 200°C), -148 to 1022°F (-100 to 550°C).
		Typical applications are: air ducts, bearing temperature, oil temperature indicator, soldering equipment, ovens, environmental test chambers, pharmaceutical manufacturing., food processing, plastic molding, petroleum & chemical processing, electric generating plants, etc.
	www.dwyer-inst.com /HTDOCS/temperature/qsseriesrtd.cfm (160 words)

	Current source allows measuring three-wire RTD - 7/6/2000 - EDN (Site not responding. Last check: 2007-10-16)
		In applications in which you need remote measurement of temperature with a three-wire RTD (resistance-temperature detector), it is important to eliminate the ohmic errors caused by the excitation current flowing through the wiring resistance.
		This technique is based on the not-unreasonable assumption that the wiring resistances of the three-wire RTD are equal.
		In Figure 2 the wiring resistances are represented by lumped elements R
	www.edn.com /article/CA47002.html?spacedesc=designideas (475 words)

	Resistance Temperature Detector (RTD) elements, textiles, petrochemicals - Sensing Devices, Inc.
		Since 1982, Sensing Devices Incorporated has supplied high-quality platinum Resistance Temperature Detector (RTD) elements to manufacturers and users of Platinum Resistance Thermometers (PRTs) serving process industries such as; textiles, petrochemicals, food and dairy.
		Manufactured in Lancaster, Pennsylvania, SDI maintains a large stock of standard detectors for immediate delivery.
		Standard calibration is performed at the ice, triple point of water, and comparison method in fluidized baths adopted by the International Temperature Scale of 1990 (ITS-90).
	www.sensingdevices.com /about.htm (157 words)

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