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masthead-wrapper-innerpage"><div class="container"><div class="masthead-content innerpage-masthead"><h1>TCS Series – Coaxial Thermocouple Probes</h1><div class="breadcrumbs"><div class="container"><ul class="banner-breadcrumbs"><span><li><a href="https://raptor-scientific.com/">Home</a></li><li><a href="https://raptor-scientific.com/products/">Products</a></li><li><a href="https://raptor-scientific.com/products-category/heat-flux-transducers-and-thermocouples/">Heat Flux Transducers and Thermocouples</a></li><li class="breadcrumb_last" aria-current="page">TCS Series – Coaxial Thermocouple Probes</li></span></ul></div></div></div></div></div></section><section class="intro-section product-single-page"><div class="container article-wrapper news-events-article"><div class="news-events-article article-container"><div class="row"><div class="col-sm-6"><div class="product-category-container"><div class="product-category-img-container"> <img width="850" height="850" data-src="https://raptor-scientific.com/content/uploads/2024/01/Thermocouple.png" class="img-responsive lazyload" alt="Silver Raptor Scientific's TCS Series Coaxial Thermocouple Probe" decoding="async" data-srcset="https://raptor-scientific.com/content/uploads/2024/01/Thermocouple.png 850w, https://raptor-scientific.com/content/uploads/2024/01/Thermocouple-300x300.png 300w, https://raptor-scientific.com/content/uploads/2024/01/Thermocouple-150x150.png 150w, https://raptor-scientific.com/content/uploads/2024/01/Thermocouple-768x768.png 768w, https://raptor-scientific.com/content/uploads/2024/01/Thermocouple-700x700.png 700w" sizes="(max-width: 850px) 100vw, 850px" /></div><div class="product-details"> <img src="https://raptor-scientific.com/content/themes/raptorscientific/assets/img/product-bot-img.png"></div></div> <a class="btn btn-primary" href="/request-a-quote/">contact us to request a quote</a></div><div class="col-sm-6"><article><h2>Product Details</h2><p><span data-contrast="auto">Measure surface temperature with a response time as little as 1 microsecond</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">Our co-Axial thermocouple probes are coaxial thermocouples consisting of a small wire of one thermocouple material coated with a .0005″ thickness of a special ceramic insulation of high dielectric strength swaged securely in a tube of a second thermocouple material. The insulation resistance between the wire and the tube is effective to more than 1500°C at steady state (over 1700°C for transient temperatures). The thermocouple junction is formed by vacuum depositing a metallic coating of one to two microns thickness over the sensing end of the probe, forming a metallurgical bond. A variety of mounting configurations and transition pieces for lead wire connections may be installed on the coaxial probe assembly.</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><b><span data-contrast="auto">Fast Response Metal Wall Surface Temperature Measurements</span></b><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">Our co-Ax surface thermocouple probes offer microsecond response times in the measurement of rapidly varying metal wall surface temperatures such as encountered inside combustion chambers, gun barrels, bearings, die casting dies, and apparatus for heat transfer studies. The through-the-wall mounting technique for the Co-Ax thermocouples lends itself to measurement of wall surface temperatures where it is important not to disturb the surface geometry, such as rocket nose cones, cannon projectiles, or wind tunnel models. The wall temperatures measured in this way are often used to compute pulses of heat flux absorbed by the surface, such as aerospace models installed in shock tunnels. The probes may also be used for measurement of internal wall temperatures where the location of the sensing element must be precisely known, such as in conduction heat transfer studies.</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">The Co-Ax surface thermocouple is ideal for the applications described above because the thermal junction is formed within a one or two micron thickness at the end of the probe, thus allowing positioning of the junction within one or two microns. The probe can be installed through an accurately drilled hole in the test surface such that the junction forms a continuous part of the test surface, or it can be installed in a “blind” hole in the test wall to measure internal temperature at a precisely known location.</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><b><span data-contrast="auto">Fast Response Surface Heat Flux Measurements</span></b><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">Surface heat flux is computed from the continuous or time sampled measurement of the true metal wall surface temperature versus time using computation methods reported by a number of authors since the 1950’s, several of which are described by Beck, Blackwell, and St. Clair in Inverse Heat Conduction, Wiley Interscience, New York, 1985. The fast response capability, along with the subminiature probe diameters, allow the measurement of heat transfer rates at many points on a very small metal model in just a few milliseconds of test time. This approach can make substantial cost savings in hypersonic tunnel heat transfer research programs.</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p></article></div></div></div></div></section><section class="product-specification"><div class="container"><div class="tabs"><ul class="js-tabs"><li class="active"><a href="#tab-content-1">Available Mounting Configurations and Materials </a></li><li class=""><a href="#tab-content-2">Surface Temperature and Heat Flux Applications </a></li><li class=""><a href="#tab-content-3">Design Your Own Probes</a></li></ul><div id="tab-content-1" class="tab active"><article><p><span data-contrast="auto">Since each coaxial thermocouple should be suited in configuration and in material properties to its application, a wide variety of configurations is offered. You may specify mounting configuration by “designing your own” thermocouple probe as described on the facing page. You may specify one of the standard configurations on the back page of this brochure, select from the hundreds of standard configurations available or provide us details of your desired configuration.</span><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><p><b><span data-contrast="auto">Features</span></b><span data-ccp-props="{"201341983":0,"335559685":360,"335559739":0,"335559740":240}"> </span></p><ul><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="1" data-aria-level="1"><span data-contrast="auto">Microsecond Response to Metal Wall</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="2" data-aria-level="1"><span data-contrast="auto">Surface Temperature Changes</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="3" data-aria-level="1"><span data-contrast="auto">Allows Very Short Duration Testing</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="4" data-aria-level="1"><span data-contrast="auto">Available Probe Diameters from .015 Inch</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="5" data-aria-level="1"><span data-contrast="auto">Precise Location of Thermocouple</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="6" data-aria-level="1"><span data-contrast="auto">Rugged Renewable Junctions</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="30" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="7" data-aria-level="1"><span data-contrast="auto">Withstand High Pressure and Heat Flux</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li></ul><p><b><span data-contrast="auto">Applications</span></b><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><ul><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="1" data-aria-level="1"><span data-contrast="auto">Wind Tunnel Model Surface Temperature</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="2" data-aria-level="1"><span data-contrast="auto">And Heat Flux Measurement</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="3" data-aria-level="1"><span data-contrast="auto">Inside Surface Temperatures of engine cylinders, air compressors, gun barrels, bearings</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="4" data-aria-level="1"><span data-contrast="auto">Die Casting Dies</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="5" data-aria-level="1"><span data-contrast="auto">Blast Effects on Structures</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="31" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="6" data-aria-level="1"><span data-contrast="auto">Laser Target Surface Temperatures</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li></ul><p><b><span data-contrast="auto">Standard Configurations</span></b><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">Over the years, four standard configurations have been found to cover a wide variety of applications. The dimensions are shown below:</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><p><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> <img decoding="async" class="size-medium wp-image-3551 aligncenter" src="https://raptor-scientific.com/content/uploads/2024/02/TCS-configuration-reference-figure-300x82.png" alt="" width="300" height="82" srcset="https://raptor-scientific.com/content/uploads/2024/02/TCS-configuration-reference-figure-300x82.png 300w, https://raptor-scientific.com/content/uploads/2024/02/TCS-configuration-reference-figure.png 320w" sizes="(max-width: 300px) 100vw, 300px" /></span></p><table style="font-weight: 400;" data-tablestyle="MsoTableGrid" data-tablelook="1184" aria-rowcount="5"><tbody><tr aria-rowindex="1"><td data-celllook="0"><b><span data-contrast="auto">Model No.</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Mounting Thread</span></b><br /> <b><span data-contrast="auto">A</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Probe Diameter B</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Probe Length </span></b><br /> <b><span data-contrast="auto">C</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Thread Length </span></b><br /> <b><span data-contrast="auto">D</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Transition Length</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></p><p><b><span data-contrast="auto">E</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Transition Hex</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></p><p><b><span data-contrast="auto">F</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td><td data-celllook="0"><b><span data-contrast="auto">Total Length</span></b><span data-ccp-props="{"201341983":0,"335551550":2,"335551620":2,"335559740":259}"> </span></td></tr><tr aria-rowindex="2"><td data-celllook="0"><span data-contrast="auto">TCS-101</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">#2-56UNC</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.061</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.062</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.12</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.25</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1/4 HEX</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.44</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td></tr><tr aria-rowindex="3"><td data-celllook="0"><span data-contrast="auto">TCS-102</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">#3-56UNF</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.031</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.125</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.50</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.50</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">3/16 HEX</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1.12</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td></tr><tr aria-rowindex="4"><td data-celllook="0"><span data-contrast="auto">TCS-103</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1/4-28UNF</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.061</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.250</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1.50</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.75</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">3/8 HEX</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">2.5</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td></tr><tr aria-rowindex="5"><td data-celllook="0"><span data-contrast="auto">TCS-104</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">#4-48UNF</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.031</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1.00</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.50</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">0.50</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">1/4 HEX</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td><td data-celllook="0"><span data-contrast="auto">2.0</span><span data-ccp-props="{"201341983":0,"335559740":259}"> </span></td></tr></tbody></table></article></div><div id="tab-content-2" class="tab "><article><p><span class="TextRun SCXW150082231 BCX0" lang="EN-US" xml:lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW150082231 BCX0">In order to</span><span class="NormalTextRun SCXW150082231 BCX0"> obtain the most </span><span class="NormalTextRun SCXW150082231 BCX0">accurate</span><span class="NormalTextRun SCXW150082231 BCX0"> measurements of rapidly changing surface temperatures, it is necessary that the presence of the sensor</span> <span class="NormalTextRun SCXW150082231 BCX0">have</span><span class="NormalTextRun SCXW150082231 BCX0"> negligible effect on the temperature of the surface of interest. To meet such a condition when the surface is exposed to convective</span> <span class="NormalTextRun SCXW150082231 BCX0">heating or cooling, it is also necessary that the probe </span><span class="NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW150082231 BCX0">not disturb</span><span class="NormalTextRun SCXW150082231 BCX0"> the surface continuity so that the convective heat transfer rate will not be</span> <span class="NormalTextRun SCXW150082231 BCX0">altered. These conditions are met with the Co-Ax probe when installed in a wall so that the thermocouple junction is flush with the wall surface.</span> <span class="NormalTextRun SCXW150082231 BCX0">When so</span><span class="NormalTextRun SCXW150082231 BCX0"> installed, the sensor will accurately </span><span class="NormalTextRun SCXW150082231 BCX0">indicate</span><span class="NormalTextRun SCXW150082231 BCX0"> the surface temperature of the probe itself. In order for the probe surface temperature to</span> <span class="NormalTextRun SCXW150082231 BCX0">be at nearly the undisturbed wall surface temperature, the probe material should be selected to have values of the thermal diffusivity, α, and </span><span class="NormalTextRun SCXW150082231 BCX0">the </span><span class="NormalTextRun SCXW150082231 BCX0">thermal</span><span class="NormalTextRun SCXW150082231 BCX0"> conductivity, k, that match the corresponding wall material value of √</span><span class="NormalTextRun SpellingErrorV2Themed SCXW150082231 BCX0">kρc</span><span class="NormalTextRun SCXW150082231 BCX0"> (or k/√α) as nearly as possible, and the probe diameter should</span> <span class="NormalTextRun SCXW150082231 BCX0">be small compared to wall thickness. Approximate values at 212</span><span class="NormalTextRun SCXW150082231 BCX0">°</span><span class="NormalTextRun SCXW150082231 BCX0">F are:</span></span><span class="EOP SCXW150082231 BCX0" data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><table style="font-weight: 400;" data-tablestyle="MsoTableGrid" data-tablelook="1184" aria-rowcount="11"><tbody><tr aria-rowindex="1"><td data-celllook="0">Material</td><td data-celllook="0">k</p><p>Btu/ft hr °F</td><td data-celllook="0">α</p><p>ft2/hr</td><td data-celllook="0">√kρc</p><p>Btu/ft2 √sec °F</td></tr><tr aria-rowindex="2"><td data-celllook="0">Copper</td><td data-celllook="0">219</td><td data-celllook="0">4.3</td><td data-celllook="0">1.76</td></tr><tr aria-rowindex="3"><td data-celllook="0">Aluminum</td><td data-celllook="0">119</td><td data-celllook="0">3.3</td><td data-celllook="0">1.09</td></tr><tr aria-rowindex="4"><td data-celllook="0">Platinum</td><td data-celllook="0">42</td><td data-celllook="0">0.98</td><td data-celllook="0">0.69</td></tr><tr aria-rowindex="5"><td data-celllook="0">Iron</td><td data-celllook="0">33</td><td data-celllook="0">0.63</td><td data-celllook="0">0.69</td></tr><tr aria-rowindex="6"><td data-celllook="0">Carbon Steel (C1020)</td><td data-celllook="0">27</td><td data-celllook="0">0.53</td><td data-celllook="0">0.62</td></tr><tr aria-rowindex="7"><td data-celllook="0">Alumel</td><td data-celllook="0">17</td><td data-celllook="0">0.26</td><td data-celllook="0">0.56</td></tr><tr aria-rowindex="8"><td data-celllook="0">Type 410 Stainless Steel</td><td data-celllook="0">14</td><td data-celllook="0">0.27</td><td data-celllook="0">0.45</td></tr><tr aria-rowindex="9"><td data-celllook="0">Constantan</td><td data-celllook="0">13</td><td data-celllook="0">0.23</td><td data-celllook="0">0.45</td></tr><tr aria-rowindex="10"><td data-celllook="0">Chromel P</td><td data-celllook="0">11</td><td data-celllook="0">0.19</td><td data-celllook="0">0.42</td></tr><tr aria-rowindex="11"><td data-celllook="0">Type 302 Stainless Steel</td><td data-celllook="0">9.4</td><td data-celllook="0">0.16</td><td data-celllook="0">0.39</td></tr></tbody></table><p><span data-contrast="auto">Probes may also be used to measure surface temperature in sliding contact areas such as bearing faces. In many such abrading applications, the thermal junction at the end of the probe continuously re-establishes itself due to the action of the facing surface in forming new “slivered” junctions of the thermocouple material across the small insulation gap. This sliver junction technique is often used to establish junctions on contoured model installations and to renew those junctions when necessary, while the probes are in place in the test article. Complete instructions for completing these junctions are available from the factory. The advantages of the probe when installed are:</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><ul><li data-leveltext="" data-font="Symbol" data-listid="42" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="1" data-aria-level="1"><b><span data-contrast="auto">Time Constant</span></b><span data-contrast="auto">: The small thickness and mass of the thermocouple junction allows a nominal time constant of 1 microsecond for the vapor deposited junction. The time constant is the theoretical time to reach 63.2% of a step change in surface temperature for a 2 micron thick junction. The observed time constant for sliver junctions is usually less than 10 microseconds.</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="42" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="2" data-aria-level="1"><b><span data-contrast="auto">Accuracy</span></b><span data-contrast="auto">: ISA Standard Limits of Error materials are used. Conduction losses are similar to the undisturbed wall because the thermocouple materials become part of the wall.</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li><li data-leveltext="" data-font="Symbol" data-listid="42" data-list-defn-props="{"335552541":1,"335559684":-2,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="3" data-aria-level="1"><b><span data-contrast="auto">No Surface Protuberance</span></b><span data-contrast="auto">: Convective flow over the surface is undisturbed.</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></li></ul><p><img decoding="async" class="size-medium wp-image-3552 aligncenter" src="https://raptor-scientific.com/content/uploads/2024/02/TCS-Coaxial-Surface-Temperature-Probes-mounting-configurations-300x159.png" alt="" width="300" height="159" srcset="https://raptor-scientific.com/content/uploads/2024/02/TCS-Coaxial-Surface-Temperature-Probes-mounting-configurations-300x159.png 300w, https://raptor-scientific.com/content/uploads/2024/02/TCS-Coaxial-Surface-Temperature-Probes-mounting-configurations-768x408.png 768w, https://raptor-scientific.com/content/uploads/2024/02/TCS-Coaxial-Surface-Temperature-Probes-mounting-configurations.png 1000w" sizes="(max-width: 300px) 100vw, 300px" /></p></article></div><div id="tab-content-3" class="tab "><article><p><b><span data-contrast="auto">Design Your Own Probes</span></b><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">Order “design your own” probes from the page below and the above standard models by the number as shown above. To designate the thermoelectric materials, add the ISA material designation code as – “M” at the end of the model number. For example, a model TCS-103 probe with a constantan inner thermoelement and iron outer thermoelement is designated model TCS-103-J, a model often used in die casting dies. The platinum 10% rhodium vs. platinum is not available in 0.061 diameter.</span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><p><b><span data-contrast="auto">Special Co-Ax Surface Thermocouple Probes</span></b><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p><p><span data-contrast="auto">The Co-Ax surface probes can be routinely customized in many ways. In addition to the shapes presented here, many units are available to install from the outside surface of a model. The sensitive end of the probe may be shaped at installation to fit the contour of virtually any metal surface. Special mounting provisions, probe sizes, and high temperature MgO insulated sheathed lead wire is available. Thermocouples can be provided to fit existing mounting holes for quartz crystal pressure transducers and spark plugs. Models with back side thermocouples are available for steady state heat flux measurements. Special materials may be used with appropriate calibration of their thermoelectric properties. Many customers have us install the probes in their test articles at our facility. Triaxial thermocouples are available which offer good thermal connection but provide electrical isolation of the thermocouple junction from its surroundings (ungrounded junction). </span><span data-ccp-props="{"201341983":0,"335559739":0,"335559740":240}"> </span></p></article></div></div></div></section><section class="products-categories product-single-page"><h3>Heat Flux Transducers and Thermocouples</h3><h2>Products</h2><div class="row"><div class="container"><div class="col-sm-4"><div class="product-category-container"><div class="product-category-img-container"> <img width="850" height="850" data-src="https://raptor-scientific.com/content/uploads/2023/04/64-SeriesQW-1C-HeatFluxTransducer.png" class="img-responsive lazyload" alt="64 Series QW-1C Heat Flux Transducer" decoding="async" data-srcset="https://raptor-scientific.com/content/uploads/2023/04/64-SeriesQW-1C-HeatFluxTransducer.png 850w, 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href="https://raptor-scientific.com/products/tcfw-series-fine-wire-thermocouple-probes/">View Product</a></div></div></div><div class="col-sm-4"><div class="product-category-container"><div class="product-category-img-container"> <img width="850" height="850" data-src="https://raptor-scientific.com/content/uploads/2023/04/30-200-1.5-36-21872-StagnationProbe.png" class="img-responsive lazyload" alt="Copper colored thermocouple 64 Series Heat Flux Transducers Stagnation Probe" decoding="async" data-srcset="https://raptor-scientific.com/content/uploads/2023/04/30-200-1.5-36-21872-StagnationProbe.png 850w, https://raptor-scientific.com/content/uploads/2023/04/30-200-1.5-36-21872-StagnationProbe-300x300.png 300w, https://raptor-scientific.com/content/uploads/2023/04/30-200-1.5-36-21872-StagnationProbe-150x150.png 150w, https://raptor-scientific.com/content/uploads/2023/04/30-200-1.5-36-21872-StagnationProbe-768x768.png 768w, 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