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Topic: Bimetallic strip

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	Bi-metal - Wikipedia, the free encyclopedia
		The strip consists of two layers, usually iron and copper.
		In regulating thermostats that operate over a wide range of temperatures the bi-metal strip is mechanically fixed and attached to an electrical power source while the other (moving) end carries an electrical contact.
		A direct indicating dial thermometer (such as a patio thermometer or a meat thermometer) uses a bi-metallic strip wrapped into a coil, as does a common household thermostat.
	en.wikipedia.org /wiki/Bimetallic (448 words)

	PIRA 4A30.00 SOLID EXPANSION (Site not responding. Last check: 2007-10-14)
		A bimetal strip of brass and steel is heated in a Bunsen burner flame.
		Two 25 cm strips of brass and invar steel are welded together for use as a bimetal strip.
		One edge of a strip of plate glass is heated with a Bunsen burner causing the glass to bend toward the cooler side.
	www.physics.ncsu.edu /pira/4therm/4A30.html (624 words)

	Wacky Patent of the Month (Sep. 1997): U.S. Patent 4,634,021
		The bimetallic strip is fixedly supported at one end in a slot 10 in the body 4 by crimping the portions of the body on either side of the slot 10 against the bimetallic strip or otherwise fastening the strip therein as by soldering, for example.
		The opposite free end of the bimetallic strip is positioned for movement toward and away from the passageway 5 for at least partially obstructing the passageway to prevent movement of the balls 2 and 3 along the passageway and past the strip 9 before temperature of the bimetallic strip reaches the predetermined release temperature.
		Since the amount of bending of the bimetallic strip is proportional to the temperature, changing the relative spacing between the support 6' and the free end of the bimetallic strip necessarily changes the release temperature at which the balls 2 and 3 can roll unobstructed past the free end of the bimetallic strip.
	colitz.com /site/4634021/4634021f.htm (1800 words)

	Patent 4000484: Directly heated bimetallic strip for use in a thermal trip
		Bimetallic strips are known in which one end is fixed and the other end is free and power supply connections are provided both at its fixed end and at its free end.
		When the bimetallic strip deflects under overcurrent, the holding catch of the bimetallic strip releases the contact bridge at a certain deflection, so that the bridge is moved into the off position under the action of a pressure spring.
		A central part 3 of the bimetallic strip 1 is slit in such a way that it is divided up into three arms 4 to 6, which are parallel to one another and extend along the longitudinal direction of the bimetallic strip 1.
	www.freepatentsonline.com /4000484.html (1756 words)

	Patent 4035552: Electrochemical cell
		The switch preferably comprises a bimetallic strip mounted in the space between the cell cover and case and is electrically connected between one of the cell electrodes and its associated terminal.
		a bimetallic element for electrically connecting the terminal and its associated electrode and being deformable at excessive cell temperatures to interrupt the connection, the bimetallic element being positioned such that displacement of the deformable wall section in response to excessive cell pressure deforms the bimetallic element to interrupt the connection.
		The displacement of the bimetallic strip end 30a may be made compartively large with respect to that of the diaphragm 34 by lever means such as a piece of generally V-shaped spring steel 36, having an offset apex 36a in contact with the diaphragm and one end 36b engaging the cover 13 for pivoting movement.
	www.freepatentsonline.com /4035552.html (2014 words)

	Bimetallic strip with liquid nitrogen (Site not responding. Last check: 2007-10-14)
		The bimetallic strip shown is made up of brass and stainless steel, with the brass having the higher thermal expansion coefficient.
		Note that the strip bends more when placed over the burner than when placed in the liquid nitrogen.
		Note the frost which forms on the bimetallic strip when it is first placed above the flame.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/bimetal.html (108 words)

	MANOMETERS
		The essential element in a bimetallic expansion thermometer is a bimetallic strip consisting of two layers of different metals fused together.
		The end of the strip that is not fixed in position is fastened to the end of a pointer that moves over a circular scale.
		Bimetallic thermometers are easily adapted for use as recording thermometers; a pen is attached to the pointer and positioned so that it marks on a revolving chart.
	www.tpub.com /fireman/117.htm (967 words)

	Bimetallic Strip Applications (Site not responding. Last check: 2007-10-14)
		A typical pair is brass and steel with typical expansion coefficients of 19 and 13 parts per million per degree Celsius respectively.
		The examples shown are straight strips, but bimetallic strips are made in coils to increase their sensitivity for use in thermostats.
		One of the many uses for bimetallic strips is in electrical breakers where excessive current through the strip heats it and bends it to trip the switch to interrupt the current.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/bimet.html (92 words)

	WFTV.com - Automotive - How Do Gas Gauges Work? (Site not responding. Last check: 2007-10-14)
		The bimetallic strip is hooked up to the needle of the gauge through a linkage.
		The bimetallic strip is a piece of metal made by laminating two different types of metal together.
		When the strip is heated, one metal expands less than the other, so the strip curves, with the metal that expands more on the outside.
	www.wftv.com /automotive/3401011/detail.html (1132 words)

	Falcon Car Club WA (Site not responding. Last check: 2007-10-14)
		The red pointer on the face of the gauge is fixed to a bimetallic strip inside, around which is wound a electric heating coil of wire.
		This little critter is also a bimetallic strip but its little coil is switched off as it bends away from a contact that feeds it.
		To the right is the Temp bimetallic strip and the pointer with the white wire from the middle terminal around the strip and on to the sender terminal.
	www.stormloader.com /falconccwa/gaugehint.htm (983 words)

	AllRefer.com - actinometer, Meteorological Instrument (Meteorological Instruments) - Encyclopedia
		Actinometers are used chiefly in meteorology to measure solar radiation as transmitted directly by the sun, scattered by the atmosphere, or reflected by the earth.
		The subsequent bending of the strips is measured.
		Knowledge of such factors as the heat capacity of the strips, their surface area, their reflectivity, and the differences in their curvature produced by a given change in temperature gives the heating power of the radiation.
	reference.allrefer.com /encyclopedia/A/actinome.html (253 words)

	Arcadia : FAQ - How does a fluorescent starter switch works? (Site not responding. Last check: 2007-10-14)
		This is a strip of metal made of two different types of metal, each having a different rate of expansion.
		When the current is first switched on, the bimetallic strip is straight, and its contact open, so the current going through the starter switch goes though the argon gas in the form of an arc.
		The argon arc no longer operates and as the source of the heat is removed the bimetallic strip cools and begins to straighten until the contacts open again.
	www.arcadia-uk.com /cgi-bin/faq/hifaq.pl?si=1007035282 (449 words)

	Vacation Break for Electrical Machines (Site not responding. Last check: 2007-10-14)
		Because bimetallic strips take time to heat up and bend, this type of tripping device is used for tripping prolonged overloaded situations.
		In this case, the current is not causing the high temperature in the bimetallic strip, but the ambient air is! The current may still be below the safe operating rated value for the motor.
		In this case, a compensating bimetallic strip may be incorporated into the circuit breaker to eliminate this type of error.
	www.best-plumber.com /articles/vacation-break-for-electrical-machines.html (757 words)

	Centre DeVerre LLC - Operating Instructions: G, GS, and GS--E Glass Kiln Series
		It is the bimetallic strip, consisting of two metals (phosphor and bronze) which have different rates of expansion and contraction that causes the switch to cycle.
		As the strip cools, it relaxes enough that the pull from the magnet positioned opposite the strip comes into play with a snap action and the contacts close.
		This re-energizes the element and the bimetallic strip, causing the cycle to repeat.
	www.cdvkiln.com /manual_gs.htm (1481 words)

	Copperweld (Site not responding. Last check: 2007-10-14)
		The Bimetallic Products Division will be showcasing their entire line of bimetallic wire, strand, and strip products.
		Bimetallic wire and strip products are well-suited for a variety of applications in the automotive industry, including wiring, cabling, connectors, and sensors.
		This year the Bimetallic Products Division will be exhibiting jointly with the LTV Copperweld Automotive Group which has years of experience in the automotive industry.
	www.copperweld.com /cwwire/pr100200ab.html (198 words)

	Howstuffworks "How Thermometers Work"
		The bimetallic strip thermometer, because it is made of metal, is good at controlling things.
		The principle behind a bimetallic strip thermometer relies on the fact that different metals expand at different rates as they warm up.
		By adjusting the size of the gap between the strip and the contact, you control the temperature.
	home.howstuffworks.com /therm2.htm (238 words)

	Ch 01
		As the strip is heated, the brass, having a larger coefficient of thermal expansion, expands more than the steel.
		Thus, the bimetallic strip bends into an arc away from the contact point, and the electric current drops to zero because the charges no longer have a continuous path along which to flow.
		As the bimetallic strip cools, it bends back to its initial position, as shown in the drawing in the text.
	www.emory.edu /PHYSICS/Faculty/Benson/142/concepts1/CQ20.htm (1754 words)

	Online Dictionary for French English, Spanish English, Italian English, and more.
		A form of entertainment in which a dancer undresses to music; "she did a strip right in front of everyone"; SYN: striptease.
		Cultivation of crops in strips following the contours of the land to minimize erosion.
		A strip of material to cover the joint of a door or window to exclude the cold; SYN: weather stripping.
	www.ultralingua.net /?service=ee&text=Strip (342 words)

	BBC - KS3 Bitesize - SOS Teacher Science chemistry Practise papper
		A bimetallic strip is a strip with two different metals in it, usually two pieces glued of otherwise joined together back to back.
		If you took a piece of blue paper and cut a strip, and a piece of red paper and cut a strip, and glued them together, you would have a bipaper strip.
		A bimetallic strip will bend when heated, as the different metals will expand at different rates.
	www.bbc.co.uk /schools/ks3bitesize/sosteacher/science/45268.shtml (181 words)

	Strip
		A strip of paper becomes a spiral, if you pull the strip between the thumb and the edge of a knife, pressing hard.
		Once this bimetallic bar is heated, one metal strip expands more than the other causing the bar to bend.
		The reason that the strip of paper bends is not the difference in temperature between the top and bottom side.
	www.mathematische-basteleien.de /strip.html (444 words)

	THERMOSTAT-BIMETALLIC THERMOSTAT-APPLICATIONS OF THERMAL EXPANSION
		A bimetallic thermostat device consists of a strip of two different metals having different coefficients of linear expansion.
		The bimetallic strip works as an electric contact breaker in an electric heating circuit.
		Bimetallic thermostats are widely used in numerous appliances such as refrigerator, airconditioner, Iron, ice plants etc.
	www.citycollegiate.com /thermostat.htm (158 words)

	Thermocouple thermometers, Thermistor thermometers, Needle probes - TME Electronics
		Bulb thermometers are good for measuring temperature accurately, but thermocouple thermometers, they are harder to use when the goal is to control the temperature.
		The bimetallic strip thermometer, because it is made of thermocouple thermometers, metal, is good at controlling things.
		In this diagram, the green metal would be chosen to expand faster than the blue metal if the device were being used in food probes, an oven.
	www.tmelectronics.co.uk (417 words)

	Canada Science and Technology Museum
		This is demonstrated by a bimetallic strip, which is made of two different types of metal (such as copper and zinc) stuck together.
		When a bimetallic strip is exposed to temperatures lower than those of room temperature, the strip will bend.
		The strip will bend in the direction of the metal that contracts the most (copper in the case of the copper-and-zinc bimetallic strip).
	www.sciencetech.technomuses.ca /English/schoolzone/Info_Science2.cfm (1671 words)

	The Bimetallic Strip (Site not responding. Last check: 2007-10-14)
		This strip of metal is actually a sandwich of two metals.
		Bimetallic strips are used in devices such as thermostats.
		A circuit can be set up with the strip as a part of it, and when the strip bends, the circuit is opened and the heat is turned off.
	www.ced.appstate.edu /~goodmanj/4401/notes/heat1/bimetallic.html (107 words)

	E21BMW.net :: Technical > Bosch K-Jet Tuning
		From this I have concluded that either: a) the warmup regulator is shot because the bimetallic strip is not bending enough to allow the spring to close the regulator -or- b) my test is flawed, and the warmup regulator might still be good.
		The bimetallic strip raises the temperature initially, but because of the resistor, doesn't get it hot enought to completely close it.
		I was wondering about the ability of the bimetallic strip to self-heat enough to close the valve.
	www.e21bmw.net /tech/kjet.php (11411 words)

	Paton Welding Institute - Electron Beam Welding (Site not responding. Last check: 2007-10-14)
		High-precision strip alignment device mounted on a movable chamber wall reduces the machine idle period at a cleaning/adjustment procedures.
		Continuous EB welding of bimetallic strip (high-speed steel+structural alloy steel) for hand saw and band saw blades production.
		High-precision strip alignment device is mounted inside chamber on a door, movable along the welding direction.
	www.nas.gov.ua /pwj/beam/i04m.html (200 words)

	270 Problem Set 19 (Site not responding. Last check: 2007-10-14)
		If a straight bimetallic strip 18 cm long and 0.1 cm thick is clamped at one end and heated by 15 Celsius degrees, what is the required difference in coefficients of expansion to deflect the metals by 0.23 cm?
		In this problem I use d for the thickness of the strip, x for the deflection of the strip, L for the length of the strip, and
		A transducer that depends on the bimetallic strip to control heating systems is called a thermostat.
	members.tscnet.com /ddavis/270_ps19.html (450 words)

	Physics Resource Collection - Thermo DCS (Site not responding. Last check: 2007-10-14)
		4A30.10 bimetal strip A bimetal strip of brass and steel is heated in a Bunsen burner flame.
		4A30.10 bimetallic strip A pointer is mounted on the end of a bimetallic strip.
		was bonded to a strip and a plate of metal and the resulting color change compared well with a computer generated model.
	www.wfu.edu /physics/pira/ResourceCD/DCS/ThermoDCS.htm (13391 words)

	Va Tech Physics Lecture Demo H14
		Heat the strip with the heat gun or Bunsen burner and show that it bends due to differential expansion.
		Use the heat gun to heat the bimetallic strip of the thermometer and note the effect on the pointer.
		Using the heat gun, heat the bimetallic strip until the light goes off, thus showing the effect of a thermostat to regulate a heating system.
	www.phys.vt.edu /~demo/demos/h14.html (224 words)

	temperature_review
		Students should be able to describe different types of thermometers: liquid, gas, bimetallic strip, and thermocouple.
		Using their knowledge of expansion and contraction, students should be able to explain how liquids, gas, and bimetallic strip thermometers work.
		Describe the difference between a bimetallic strip and a thermocouple.
	www.k12.nf.ca /sjis/science7/temperature_review.htm (460 words)

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