Thermocouple

<h2>TYPE-K Thermocouple Vacuum Feedthroughs</h2><p><strong>Thermocouple</strong> feedthroughs are mixed thermocouple-power contact combinations fitted on one feedthrough assembly constructed with pin arrangements designed to meet IEC 807-2 and DESC 85039 specifications.</p><p>Standard configurations include power pins, Chromel<font size="2">^®</font> / Alumel<font size="2">^®</font> Type-K thermocouple pin pairs, and combinations in a single subminiature-D shell.&nbsp; Straight through pins are hermetically sealed and electrically insulated in a stainless steel shell using the latest in glass-ceramic bonding technology.&nbsp; <strong>Ultrahigh (UHV)</strong>&nbsp;vacuum cable assemblies with PEEK (polyetheretherketone) connectors and Kapton<font size="2">^®</font> insulated wires are available to meet the demands of UHV environments.&nbsp;</p><p><strong>In-vacuum</strong> cable assemblies, individual connectors, and other accessories are available from the links below.&nbsp; Available in both UHV and <strong>High Vacuum (HV)</strong> configurations.&nbsp;</p><p>Custom thermocouple feedthrough flange and cable assemblies are available on request.</p><table style="width:100%;" border="1" cellpadding="1" cellspacing="1" dir="ltr" summary="Thermocouple Type-K Feedthrough Specifications"><caption>Thermocouple Type-K Feedthrough Specifications</caption><thead><tr><th style="background-color:rgb(221, 221, 221);text-align:left;" scope="col"><strong>Electrical</strong></th><th style="background-color:rgb(221, 221, 221);" scope="col">&nbsp;</th></tr></thead><tbody><tr><td><ul><li>Thermocouple Pins - Voltage, Maximum</li><li>Power-D Pins - Voltage, Maximum</li><li>Thermocouple Pins - Current, Per Pin Maximum @ 20ºC</li><li>Power-D Pins - Current, Per Pin Maximum @ 20ºC</li></ul></td><td style="text-align:right;"><br>Millivolts<br>500 VDC<br>Milliamps<br>20 Amps</td></tr><tr><td><span style="font-size:10px;">*&nbsp; For proper heat dissipation, a maximum of 20% of the pins on a feedthrough may carry the maximum pin current at any given time.</span></td><td style="text-align:right;">&nbsp;</td></tr></tbody></table><table style="width:100%;" border="1" cellpadding="1" cellspacing="1" summary="Thermocouple Type-K Feedthrough Material Specifications"><caption>Thermocouple Type-K Feedthrough Material Specifications</caption><thead><tr><th style="background-color:rgb(221, 221, 221);text-align:left;" scope="col"><strong>Material</strong></th><th style="background-color:rgb(221, 221, 221);" scope="col">&nbsp;</th></tr></thead><tbody><tr><td><ul><li>Shell</li><li>Thermocouple - Pins (+)</li><li>Thermocouple - Pins (-)</li><li>Power - Pins</li><li>Seal / Insulator</li><li>Connector, Air</li><li>Connector, Vacuum</li></ul></td><td><p style="text-align:right;"><br>304 Stainless Steel<br>Chromel®<br>Alumel®<br>Au plated, Ni-Fe alloy<br>Glass-Ceramic<br>Delrin®<br>Peek*</p></td></tr><tr><td><span style="font-size:10px;">*&nbsp; Peek is a Polyether-ether-ketone thermoplastic.</span></td><td>&nbsp;</td></tr><tr><td>&nbsp;</td><td>&nbsp;</td></tr></tbody></table><table style="width:100%;" border="1" cellpadding="1" cellspacing="1" id="Feedthrough Vacuum Range" summary="Feedthrough Vacuum Range Specifications"><caption>Feedthrough Vacuum Range Specifications</caption><thead><tr><th style="background-color:rgb(221, 221, 221);text-align:left;" scope="col"><span><strong>Vacuum Range</strong></span></th><th style="background-color:rgb(221, 221, 221);" scope="col">&nbsp;</th></tr></thead><tbody><tr><td><ul><li>UHV, Ultrahigh vacuum</li><li>HV, High vacuum</li></ul></td><td style="text-align:right;"><br>1x10^-10 Torr<br>1x10^-8 Torr</td></tr></tbody></table><table style="width:100%;" border="1" cellpadding="1" cellspacing="1" id="Feedthrough Temp Range" summary="Feedthrough Temperature Range Specifications"><caption>Feedthrough Temperature Range Specifications</caption><thead><tr><th style="background-color:rgb(221, 221, 221);text-align:left;" scope="col"><span><strong>Temperature Range</strong></span></th><th style="background-color:rgb(221, 221, 221);" scope="col">&nbsp;</th></tr></thead><tbody><tr><td><ul><li>Feedthrough</li><li>Flange Mount, Conflat</li><li>Flange Mount, ISO</li><li>Connector / Cable, Air</li><li>Connector / Cable, Vacuum</li><li>Thermal Gradient</li></ul></td><td><p style="text-align:right;"><br>-200ºC to 250ºC<br>-200ºC to 450ºC<br>-26ºC to 150ºC<br>80ºC<br>250ºC<br>25ºC / Minute Maximum</p></td></tr><tr><td><span style="font-size:10px;">* Overall assembly ratings must be adjusted to that of the lowest-rated component.</span></td><td>&nbsp;</td></tr></tbody></table><p>Thermocouple feedthroughs do not measure temperature but merely provide a conduit to bring the EMF signal generated at a thermocouple junction through a vacuum vessel wall to an external voltage measuring or temperature readout instrument.&nbsp; Type-K thermocouples with positive Chromel^® wires and negative Alumel^® wires are recommended for use in clean oxidizing atmospheres.&nbsp; The maximum operating temperature for these alloys is 1260°C for larger wire sizes.&nbsp; The useful temperature measuring range for a Type-K thermocouple is between -200°C to 1250°C.</p>