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   Sensors, Bimetallic

A bi-metallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper. The strips are joined together throughout their length by rivets, by brazing or by welding. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its normal temperature. The metal with the higher expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled.

The sideways displacement of the strip is much larger than the small lengthways expansion in either of the two metals. This effect is used in a range of mechanical and electrical devices. In some applications the bi-metal strip is used in the flat form. In others, it is wrapped into a coil for compactness. The greater length of the coiled version gives improved sensitivity.



Fixed and programmable amplifiers - Frequency Devices

 

Books
Sensors and Transducers, Third Edition
Ian Sinclair

Excerpt - page 87: "... and discharging some heat at a lower temperature. 4.2 The bimetallic strip Thermal sensing is important ... The simplest type of thermal sensor is the bimetallic type, whose principle is illustrated in Figure ..."
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Instrumentation & Sensors for the Food Industry
Erika Kress-Rogers and Christopher J B Brimelow

Excerpt - page 28: "... or steam flow Pressure Monitoring process parameters with AC/DC measurements Sensor/instrument/method: Determined property: Piezoresistor Strain gauge ... Capacitive pressure sensor on diaphragm Bimetallic strip RTD (resistance temperature detector) Themocouple probe Strain gauge configured ..."
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Sensors and Signal Conditioning, 2nd Edition
Ramón Pallás-Areny and John G. Webster

Excerpt - page 38: "... of Measurements & Control lists the manufacturers and types of bimetallic thermometers. 1.7.2 Pressure Sensors Pressure measurement in liquids or gases is common, particularly in ..."
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Semiconductor Sensors
Simon M. Sze

Theory and Design for Mechanical Measurements
Richard S. Figliola and Donald E. Beasley

Excerpt - page 287: "... range from  to f2"C, depending on the specific instrument. Bimetallic Thermometers The physical phenomenon employed in it bimetallic temperature sensor is the the/ierenliial thermal expansion of two metals. Figure 8.3 ..."
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Museum Environment, Second Edition (Butterworth - Heinemann Series in Conservation and Museology)
GARRY THOMSON CBE

Excerpt - page 69: "... a one-week record, temperature above and RH below. The RH sensor is a bunch of human ... The temperature sensor is a bimetallic strip bent into a cylinder. On a rise in temperature ..."
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Mechanisms and Mechanical Devices Sourcebook
Neil Sclater and Nicholas Chironis

Excerpt - page 396: "... cost. /n Salo /,on--- $/ru/ con/oc/s She// Fig. 1 A bimetallic sensor is simple, compact, and precise. Contacts mounted on low-expansion struts ..."
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Practical Interfacing in the Laboratory: Using a PC for Instrumentation, Data Analysis and Control
Stephen E. Derenzo

Excerpt - page 237: "... of platinum metal on an alumina (A1203) substrate. 4.3.3 The bimetallic switch and the dial thermometer One of the most common temperature sensors is the bimetallic switch, which opens and closes an electrical ..."
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Total Automotive Technology
Anthony E. Schwaller

Excerpt - page 342: "... 342 Section 3 Mechanical/Fluid Engine Systems Coil sensor (bimetallic) Front Radiator Lower radiator supports Motor and coolant fan FIGURE ..."
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Audel HVAC Fundamentals, Heating System Components, Gas and Oil Burners and Automatic Controls
James E. Brumbaugh

Excerpt - page 6: "... cad cell fails to prove the flame or if the bimetallic sensor detects a temperature too high for safe operation. Primary Safety ..."
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Electric Kiln Ceramics: A Guide to Clays and Glazes
Richard Zakin and Barbara Case

Excerpt - page 4: "... program. Controlling the Firing with Pyrometers Pyrometers are made from bimetallic sensors that are intended for measuring very high temperatures of the ..."
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Scientific Protocols for Fire Investigation (Protocols in Forensic Science)
John J. Lentini

Excerpt - page 229: "... on the heater case. This thermostat remained connected to the bimetallic sensor and was capable of being tested using a hair dryer ..."
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Introduction to Food Engineering, Third Edition (Food Science and Technology International Series) (Food Science and Technology)
R. Paul Singh and Dennis R. Heldman

Excerpt - page 58: "... experiment was conducted to measure the time constant of a bimetallic sensor. The sensor was initially equilibrated in ice water. The experiment ..."
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Simplified Design of HVAC Systems
William Bobenhausen

Excerpt - page 393: "... electrical resistance as temperature changes, used in electronic controls. Humidity Sensors. Mechanical humidity sensors use elements ... to the humidity FIGURE 23.8 Bimetallic sensor responds to changes in temperature. ..."
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Arco Air Conditioning and Refrigeration Toolbox Manual (Arco's on-the-Job Reference Series)
David J. Tenenbaum

Excerpt - page 105: "... of sensing elements have been developed for controls. Electromechanical temperature sensors include: A bimetallic element is a sandwich of two types of metal with ..."
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Understand Electronic Control Systems
Owen Bishop

Excerpt - page 19: "... electronic systems, Fig. 1.12 illustrates a purely mechanical system. The sensor is a bimetallic strip, which consists of two layers of different metals, each ..."
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Boiler Operator's Guide
Anthony L. Kohan

Excerpt - page 355: "... Temperature measurement. (a) Temperature limits ot different temperature sensors; (b) bimetallic thermometer; (c) filled-system thermometer . (Courtesy Power magazine i sure. ..."
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Robotics: Designing the Mechanisms for Automated Machinery
Ben Zion Sandler

Excerpt - page 201: "... shown schematically in Figure 5.41, is an effective on-off temperature sensor. The bimetallic strip 4 consists of two different metallic strips 1 and ..."
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Properties and Applications of Nanocrystalline Alloys from Amorphous Precursors: Proceedings of the NATO Advanced Research Workshop on Properties and Applications ... II: Mathematics, Physics and Chemistry)
Bogdan Idzikowski, Peter `vec, and Marcel Miglierini

Excerpt - page 196: "... bias field level, one can determine the temperature of the sensor. In this magnetomechanical resonance, the ... a reliable temperature sensor. A bimetallic temperature sensor has been demonstrated utilizing the magnetostrictive effect of ..."
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Practical Electronics Handbook, Fifth Edition
Ian Sinclair

Excerpt - page 363: "... of either the bimetallic or thermistor (see Chapter 5) types. Bimetallic sensors are cheap and robust, and less liable to false triggering ..."
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ServSafe Coursebook, Second Edition
Nra Educational Foundation

Excerpt - page 87: "... food. The most common types used in establishments are the bimetallic stemmed thermometer, the thermocouple, and ... a metal probe with a sensor in the end. Bimetallic stemmed thermometers often have scales measuring ..."
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The Complete Corvette Restoration and Technical Guide, Vol. 1: 1953 Through 1962
Noland Adams

Excerpt - page 131: "... undrilled. Some later Chevrolet passenger cars and pickups featured a bimetallic temperature sensor on the intake manifold; in such an application, the exhaust ..."
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Designer's Handbook Instrmtn/Contr Circuits
Joseph J. Carr

Excerpt - page 88: "... (see Chapter 12). Fig. 4-15 Two-point calibration of the AD-590 sensor. ..."
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Control Systems
R. V. Dukkipati

Excerpt - page 13: "... Process temperature !N/OFF Compressor Dynamics of heat flow + L---------------- Sensor Bimetallic strip Temperature Thermostat L------------------------------------------- Fig. E1.8 Block diagram representation of ..."
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Design of Devices and Systems, Third Edition,
William H. Middendorf

Excerpt - page 161: "... circuits 24 ..Current and temperature 25 Motor temperature 26 With bimetallic sensor 27 ..With thermistor sensor 28 With time delay 29 ..During ..."
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Scientific American Science Desk Reference (Scientific American (Wiley))
Scientific American

Excerpt - page 648: "... device that makes use of feedback. It employs a temperature sensor (often a bimetallic strip) to operate a switch or valve to control electricity ..."
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Boiler Operator's Handbook
Ken Heselton

Excerpt - page 295: "... proportional to the temperature then convert it to a signal. Bimetallic sensors use the movement or force produced by the difference in ..."
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Asset Maintenance Management: A Guide to Developing Strategy and Improving Performance
Alan Wilson

Excerpt - page 298: "... boundary layer is sensitive to the presence of the temperature sensor. Sensors for surface measurement are ... in glass or metal. >Bimetallic expansion sensors. ermocouple, thermistor or platinum resistance sensors. For ..."
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Facility Manager's Operation and Maintenance Handbook
Bernard T. Lewis

Excerpt - page 287: "... force balance lever system to maintain relative air pressures between sensors and controlled devices. Temperature sensors utilize a bimetallic strip that curves as temperature changes. This strip is positioned ..."
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Instrumentation Fundamentals for Process Control
Douglas De Sa

Excerpt - page 66: "... following categories: 1. Local reading instruments are fitted with either bimetallic, filled-system temperature-sensing elements, or thermoelectric temperature sensors. Scale graduations are as follows: " Bimetallic sensors have uniformly ..."
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Knight's Modern Seamanship, 18th Edition
John V. Noel

Excerpt - page 458: "... . A commonly used thermograph is one that uses a bimetallic strip as the sensor. Two thin, curved sheets of metal of widely different thermal ..."
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Microclimate for Cultural Heritage (Developments in Atmospheric Science)
D. Camuffo

Excerpt - page 318: "... sometimes in meteorology, but is not relevant in microclimate studies. Bimetallic thermographs The bimetallic thermograph is ... well known thermo-hygrograph. The bimetallic sensor is composed of two thin metal strips having different coefficients ..."
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The Cognitive Paradigm
Marc De Mey

Excerpt - page 24: "... transforms the heat into motion, usually by means of a bimetallic sensor which, through its inertia, also functions as a short term ..."
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Basic Metrology for ISO 9000 Certification
G. M. S. de Silva

Excerpt - page 147: "... error is more than one resolution should be discarded. 7.6.4 Bimetallic thermometers 7.6.4.1 Principle of operation ... a bimetallic thermometer. The bimetallic sensor consists of a strip of composite material wound in the ..."
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MEP Databook
Sidney M. Levy

Excerpt - page 500: "... C L IT-ds,r ) -OF-- B imetal Figure 5.0.3.2 A bimetallic sensor used as a simple controller The set point 15 created ..."
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Principles of Modified-Atmosphere and Sous Vide Product Packaging
Jeffrey M. Farber and Karen Dodds

Excerpt - page 388: "... (Anon., 1992a). Originally these devices were windup motors with a bimetallic sensor that gave an ink pen trace on a chart. One ..."
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