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471 Series Thermocouple and Resistance Thermometer assemblies with
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A Mineral insulated, metal sheathed Thermocouple or Thermocouple element insulated with re-crystallized alumina tube fitted into the terminal head & provided with or without head extension, a support tube & re-crystallized Alumina protecting tube covered with another ceramic or metal tube would form a typical assembly for temperature measurements of furnaces, combustion chambers,recuperators & similar applications.
The closed end Protecting Tube normally employed is re-crystallized Alumina Type 710 containing 99.7% Aluminum oxide & confirming to Type 799 as per DIN VDE 0335 & can be used for temperatures upto 1700 degC. These tubes are impervious & are fixed to metallic support tube by means of ceramic to metal cement.
The low cost option is Pythagoras Tubes, Type 610 containing
approximately 60% Aluminum Oxide as per DIN VDE 0335 & can be used for
temperatures upto 1400 deg C. The standard execution is with plated CS extension
& Aluminum head with conduit entry of 1/2"NPT.
The Thermocouple wire size when used as beaded Thermocouple is 24AWG (0.51mm)
for type R,S & 'B' & 14AWG for all base metal Thermocouples.
| No of elements | |
| Elements | |
| Sheath Diameter | |
| Sheath Material | |
| Head Type | |
| No of entries | |
| Support Tube | |
| Inner Protecting Tube | Select & Define Dimensions
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| Outer Protecting Tube | Select & Define Dimensions
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| Flange Material | Define any other flange material |
| Insertion Length U mm/inches | Define eg. 760mm |
| Extension length T mm/inches |
Define eg. 60mm |
| Flange size | Select & define the Size,rating and facing of flange |
| Options | Select and enter the options required |