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612 Series Thermocouple and Resistance Thermometer assemblies with
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A Mineral insulated, metal sheathed Thermocouple or a Thermocouple element insulated with re-crystallized alumina tube fitted into a 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 & conforming to Type 799 as per DIN VDE 0335 & can be used for temperatures upto 1700 deg C. 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 as shown in this leaflet is with plated CS extension & Aluminum head with conduit entry of 1/2"NPT.
The Thermocouple wire size when used as a beaded Thermocouple is 24 AWG (0.51mm) for type R, S & 'B' &14 AWG for all base metal Thermocouples.
| No of elements | |
| Elements | |
| Sheath Diameter for MI / Wire Diameter for BE |
Select sheath Diameter in mm for Thermocouple type MI or Wire Diameter in AWG for Beaded type Thermocouple |
| Sheath Material | |
| Head Type | |
| No of Entries | |
| Head Assembly | |
| Support Tube | |
| Inner Protecting Tube | Select & define the dimensions of inner protecting tube |
| Outer Protecting Tube | Select & define Dimensions |
| Flange Material | Define any other material & grade |
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Overall/Insertion/exposed lengths U mm/inches OL mm/inches |
eg 300mm Define eg 600mm |
| Extension Length T mm/inches |
Define eg 30mm |
| Flange Size | Select & define Flange size, rating and facing
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| Options |
Select and enter the options required |
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