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- Thermowell abstract "Thermowells are tubular fittings used to protect temperature sensors installed in industrial processes. A thermowell consists of a tube closed at one end and mounted in the process stream. A temperature sensor such as a thermometer, thermocouple or resistance temperature detector is inserted in the open end of the tube, which is usually in the open air outside the process piping or vessel and any thermal insulation. The process fluid transfers heat to the thermowell wall, which in turn transfers heat to the sensor. Since more mass is present, the sensor's response to process temperature changes is delayed. If the sensor fails, it can be easily replaced without draining the vessel or piping. To be representative of the average temperature of fluid, the thermowell must extend a few per cent of the inside diameter of the process pipe or vessel (Normally 1/3 rd of the pipe inside diameter)A thermowell is typically machined from solid bar stock and gun-drilled to ensure a long straight bore that closely approximates the diameter of the installed sensor (ex: a .260-inch bore matching a .250-inch sensor). A thermowell is typically mounted into the process stream by way of a threaded, welded, sanitary cap or flanged process connection. The temperature sensor such as a thermometer, thermocouple or resistance temperature detector is inserted in the open end of the thermowell and typically spring-loaded to ensure that the outside tip of the temperature sensor is in metal to metal contact with the inside tip of the thermowell.Thermodynamically, the process fluid transfers heat to the thermowell wall, which in turn transfer heat to the sensor. Since more mass is present with a sensor-well assembly than with a probe directly immersed into the process, the sensor's response to process temperature change is slowed by the addition of the well. Since the mass of the thermowell must be heated to the process temperature, and since the walls of the thermowell conduct heat out of the process, sensor accuracy and responsiveness is negatively impacted by the addition of a thermowell.To be representative of the average temperature of fluid, the thermowell must extend a few percent of the inside diameter of the process pipe or vessel. A rule of thumb that is sufficient for most industrial applications (approximately 1% accuracy) is to ensure that the thermowell projects 5 times its own diameter into the process plus the length of its sensing element. So, for a grounded thermocouple spring-loaded into a thermowell with a 1-inch-diameter shank and a tip thickness of .25 inch, a typical immersion length would equal 5.5 inches (1 inch OD x 5 + .25 inch well tip thickness +.25 inch sensor wall thickness = 5.5 inches).".
- Thermowell wikiPageExternalLink CommitteePages.cfm?Committee=C91930000.
- Thermowell wikiPageExternalLink sensors-used-in-industrial_25.html.
- Thermowell wikiPageExternalLink twells.html.
- Thermowell wikiPageID "12593310".
- Thermowell wikiPageLength "8470".
- Thermowell wikiPageOutDegree "30".
- Thermowell wikiPageRevisionID "681597443".
- Thermowell wikiPageWikiLink ASME.
- Thermowell wikiPageWikiLink Accelerometer.
- Thermowell wikiPageWikiLink Aerodynamics.
- Thermowell wikiPageWikiLink Alumina.
- Thermowell wikiPageWikiLink Aluminium_oxide.
- Thermowell wikiPageWikiLink Amplitude.
- Thermowell wikiPageWikiLink Bending.
- Thermowell wikiPageWikiLink Category:Temperature.
- Thermowell wikiPageWikiLink Ceramic.
- Thermowell wikiPageWikiLink Compressible_flow.
- Thermowell wikiPageWikiLink Compressible_fluids.
- Thermowell wikiPageWikiLink Drill_bit_shank.
- Thermowell wikiPageWikiLink Fatigue_(material).
- Thermowell wikiPageWikiLink Flange.
- Thermowell wikiPageWikiLink Flanged.
- Thermowell wikiPageWikiLink G-force.
- Thermowell wikiPageWikiLink Gun_drill.
- Thermowell wikiPageWikiLink Hydrostatic.
- Thermowell wikiPageWikiLink Hydrostatics.
- Thermowell wikiPageWikiLink Polytetrafluoroethylene.
- Thermowell wikiPageWikiLink Resistance_temperature_detector.
- Thermowell wikiPageWikiLink Resistance_thermometer.
- Thermowell wikiPageWikiLink Scruton_number.
- Thermowell wikiPageWikiLink Silicon_carbide.
- Thermowell wikiPageWikiLink Stainless_steel.
- Thermowell wikiPageWikiLink Tapered.
- Thermowell wikiPageWikiLink Tapering.
- Thermowell wikiPageWikiLink Teflon.
- Thermowell wikiPageWikiLink Thermocouple.
- Thermowell wikiPageWikiLink Thermometer.
- Thermowell wikiPageWikiLink Timoshenko_beam_theory.
- Thermowell wikiPageWikiLink Vibration.
- Thermowell wikiPageWikiLink Vortex_shedding.
- Thermowell wikiPageWikiLinkText "Thermowell".
- Thermowell wikiPageWikiLinkText "thermowell".
- Thermowell hasPhotoCollection Thermowell.
- Thermowell wikiPageUsesTemplate Template:Refimprove.
- Thermowell subject Category:Temperature.
- Thermowell hypernym Fittings.
- Thermowell type Article.
- Thermowell type Article.
- Thermowell type Property.
- Thermowell type Quantity.
- Thermowell type Thermodynamic.
- Thermowell comment "Thermowells are tubular fittings used to protect temperature sensors installed in industrial processes. A thermowell consists of a tube closed at one end and mounted in the process stream. A temperature sensor such as a thermometer, thermocouple or resistance temperature detector is inserted in the open end of the tube, which is usually in the open air outside the process piping or vessel and any thermal insulation.".
- Thermowell label "Thermowell".
- Thermowell sameAs Thermometerschutzrohr.
- Thermowell sameAs m.02wx1qn.
- Thermowell sameAs தெர்மோவெல்.
- Thermowell sameAs Q1637038.
- Thermowell sameAs Q1637038.
- Thermowell wasDerivedFrom Thermowell?oldid=681597443.
- Thermowell isPrimaryTopicOf Thermowell.