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    Chassis: Different types of chassis a

    What is a thermocouple sensor?

    A thermocouple is a sensor for measuring temperature. It consists of two dissimilar metals, joined together at o

    unction of the two metals is heated or cooled a voltage is produced that can be correlated back to the tempera

    thermocouple alloys are commonly available as wire.

    What are the different thermocouple types?

    A thermocouple is available in different combinations of metals or calibrations. The four most common calibrati

    There are high temperature calibrations R, S, C and GB. Each calibration has a different temperature range and e

    although the maximum temperature varies with the diameter of the wire used in the thermocouple. Although t

    calibration dictates the temperature range, the maximum range is also limited by the diameter of the thermoco

    very thin thermocouple may not reach the full temperature range.

    View a complete reference tablefor each thermocouple. The table includes international color codes for thermo

    temperature range and limits of error for almost every kind of thermocouple.

    How do I choose a thermocouple type?Because a thermocouple measures in wide temperature ranges and can be relatively rugged, thermocouples are

    industry. The following criteria are used in selecting a thermocouple:

    Temperature range Chemical resistance of the thermocouple or sheath material Abrasion and vibration resistance

    Installation requirements (may need to be compatible with existing equipment; existing holes may detediameter)

    How do I know which junction type to choose?

    Sheathed thermocouple probes are available with one of three junction types: grounded, ungrounded or expose

    below:"Thermocouple Tip Styles"). At the tip of a grounded junction probe, the thermocouple wires are physica

    inside of the probe wall. This results in good heat transfer from the outside, through the probe wall to the therm

    an ungrounded probe, the thermocouple junction is detached from the probe wall. Response time is slower tha

    but the ungrounded offers electrical isolation (see table below).

    Room-Temperature Insulation Resistance

    Ungrounded Thermocouple

    http://www.omega.com/temperature/pdf/tc_temp_limits_range.pdfhttp://www.omega.com/temperature/pdf/tc_temp_limits_range.pdfhttp://www.omega.com/temperature/pdf/tc_temp_limits_range.pdf
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    Nominal Sheath DiameterApplied dc Voltage

    min.

    Insulation Resistance

    min.

    Less than 0.90mm (0.03in.) 50V 100M Ohms

    0.80-1.5mm (0.030 to0.059in.)

    50V 500M Ohms

    Greater than 1.5mm

    (0.059in.)500V 1000M Ohms

    The thermocouple in the exposed junction style protrudes out of the tip of the sheath and is exposed to the sur

    environment. This type offers the best response time, but is limited in use to dry, noncorrosive and nonpressuri

    What is response time?

    A time constant has been defined as the time required by a sensor to reach 63.2% of a step change in temperat

    set of conditions. Five time constants are required for the sensor to approach 100% of the step change value. An

    thermocouple is the fastest responding. Also, the smaller the probe sheath diameter, the faster the response, b

    temperature may be lower. Be aware, however, that sometimes the probe sheath cannot withstand the full tem

    the thermocouple type.

    MaterialMaximum

    Temperature

    Application Atmosphere

    Oxidizing HydrogenVacuum Inert

    304 SS 900C (1650F)Very

    GoodGood

    Very

    Good

    Very

    Good

    Inconel

    6001148C (2100F)

    Very

    GoodGood

    Very

    Good

    Very

    Good

    Thermocouple Ranges and Limits of Error

    The table below shows temperature ranges and accuracy for J, K, E and T thermocouples.Additional thermocou

    http://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.html
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    Thermocouple Reference Tables

    Thermocouples produce a voltage output that can be correlated to the temperature that the thermocouple is m

    documents in the table below provide the thermoelectric voltage and corresponding temperature for a given th

    Most of the documents also provide the thermocouple temperature range, limits of error and environmental co

    click on a link below to see the related document

    Thermocouple Type B( C) Thermocouple Type B( F)

    Thermocouple Type C( C)

    Thermocouple Type C( F)

    Thermocouple Type E( C)

    Thermocouple Type E( F)

    Thermocouple Type J( C)

    Thermocouple Type J( F)

    Thermocouple Type K( C)

    Thermocouple Type K( F)

    Thermocouple Type N( C)

    Thermocouple Type N( F)

    Thermocouple Type R( C)

    Thermocouple Type R( F)

    Thermocouple Type S( C)

    Thermocouple Type S( F)

    Thermocouple Type T( C)

    Thermocouple Type T( F)

    Tungsten and Tungsten/

    Rhenium

    CHROMEGA vs. Gold-0.07

    Atomic Percent Iron

    http://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/temperature/Z/pdf/z212-213.pdfhttp://www.omega.com/temperature/Z/pdf/z212-213.pdfhttp://www.omega.com/temperature/Z/pdf/z231-236.pdfhttp://www.omega.com/temperature/Z/pdf/z239-240.pdfhttp://www.omega.com/temperature/Z/pdf/z241-245.pdfhttp://www.omega.com/temperature/Z/pdf/z206.pdfhttp://www.omega.com/temperature/Z/pdf/z221-224.pdfhttp://www.omega.com/temperature/Z/pdf/z203.pdfhttp://www.omega.com/temperature/Z/pdf/z216-217.pdfhttp://www.omega.com/temperature/Z/pdf/z204-206.pdfhttp://www.omega.com/temperature/Z/pdf/z218-220.pdfhttp://www.omega.com/temperature/Z/pdf/z214-215.pdfhttp://www.omega.com/temperature/Z/pdf/z237-238.pdfhttp://www.omega.com/temperature/Z/pdf/z210-211.pdfhttp://www.omega.com/temperature/Z/pdf/z228-230.pdfhttp://www.omega.com/temperature/Z/pdf/z208-209.pdfhttp://www.omega.com/temperature/Z/pdf/z225-227.pdfhttp://www.omega.com/temperature/Z/pdf/z207.pdfhttp://www.omega.com/temperature/Z/pdf/z223.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z223.pdfhttp://www.omega.com/temperature/Z/pdf/z207.pdfhttp://www.omega.com/temperature/Z/pdf/z225-227.pdfhttp://www.omega.com/temperature/Z/pdf/z208-209.pdfhttp://www.omega.com/temperature/Z/pdf/z228-230.pdfhttp://www.omega.com/temperature/Z/pdf/z210-211.pdfhttp://www.omega.com/temperature/Z/pdf/z237-238.pdfhttp://www.omega.com/temperature/Z/pdf/z214-215.pdfhttp://www.omega.com/temperature/Z/pdf/z218-220.pdfhttp://www.omega.com/temperature/Z/pdf/z204-206.pdfhttp://www.omega.com/temperature/Z/pdf/z216-217.pdfhttp://www.omega.com/temperature/Z/pdf/z203.pdfhttp://www.omega.com/temperature/Z/pdf/z221-224.pdfhttp://www.omega.com/temperature/Z/pdf/z206.pdfhttp://www.omega.com/temperature/Z/pdf/z241-245.pdfhttp://www.omega.com/temperature/Z/pdf/z239-240.pdfhttp://www.omega.com/temperature/Z/pdf/z231-236.pdfhttp://www.omega.com/temperature/Z/pdf/z212-213.pdf
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    Types of Thermocouples

    Beaded Wire Thermocouple

    A beaded wire thermocouple is the simplest form of thermocouple. It consists of two piec

    wire joined together with a welded bead. Because the bead of the thermocouple is expose

    application limitations. The beaded wire thermocouple should not be used with liquids tha

    oxidize the thermocouple alloy. Metal surfaces can also be problematic. Often metal surfa

    are used to ground electrical systems The indirect connection to an electrical system could

    thermocouple measurement. In general, beaded wire thermocouples are a good choice fo

    of gas temperature. Since they can be made very small, they also provide very fast respon

    Thermocouple Probe

    A thermocouple probe consists of thermocouple wire housed inside a metallic tube. The w

    referred to as the sheath of the probe. Common sheath materials include stainless steel a

    supports higher temperature ranges than stainless steel, however, stainless steel is often

    its broad chemical compatibility. For very high temperatures, other exotic sheath material

    View our line ofhigh temperature exotic thermocouple probes.

    The tip of the thermocouple probe is available in three different styles. Grounded, ungrou

    With a grounded tip the thermocouple is in contact with the sheath wall. A grounded junc

    response time but it is most susceptible to electrical ground loops. In ungrounded junction

    is separated from the sheath wall by a layer of insulation. The tip of the thermocouple pro

    sheath wall with an exposed junction. Exposed junction thermocouples are best suited for

    Thermocouple Tip Styles

    Grounded

    Thermocouple

    Ungrounded

    Thermocouple

    Exposed

    Thermocouple

    http://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperature
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    Surface Probe

    Measuring the temperature of a solid surface is difficult for most types of temperature sen

    assure an accurate measurement, the entire measurement area of the sensor must be in c

    surface. This is difficult when working with a rigid sensor and a rigid surface. Since thermo

    pliable metals, the junction can be formed flat and thin to provide maximum contact with

    These thermocouples are an excellent choice for surface measurement. The thermocoupl

    a mechanism which rotates, making it suitable for measuring the temperature of a moving

    ChromegaAlomega.

    Top Search Results for THERMOCOUPLES

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    88000 Series : Thin Leaf-Type Thermocouples

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