There are many arrangements of industrial platinum thermocouple assemblies that utilize combinations of protecting tubes, thermocouple elements, terminals and mounting options. They are categorized into SINGLE, DOUBLE and TRIPLE tube assemblies which, depending on their application and design, give various degrees of protection to the platinum thermocouple element. Platinum thermocouples are relatively expensive units that are easily contaminated, so proper protection from harmful atmospheres is required in order to get suitable service life from the assembly.
Please refer to the protecting tubes general information for material selection parameters.
The part numbers shown are for “Commonly used” assemblies. For information regarding additional assemblies contact us.
ASSEMBLY EXAMPLE: D176C – S – 24″
| Part Number | Double Tube Assembly Type | Replacement Components |
|---|---|---|
| D176C-S-24" |  | TC Element: 97-187-3-S-24"-X Protecting Tube #1: 60-687-3-24" Protecting Tube #2: SIC-24" Terminal Head (Open Head): MT1-01-( ) |
In the above example, D176C-S-24“:
- The “D1” is the assembly designation (Double Tube Type 1)
- The “7” is the Insulator Material (Alumina 997) – See Table A Below
- The “6C” is the protecting tube material designation: Tube #1 (6) – Mullite and Tube #2 (C) – Silicon Carbide – See Table B Below
- The “S” designation is thermocouple type – See Table C Below
- And the 24” designates the assembly tube length (From 12″ to 48″ in 6″ increments. For special lengths, please contact us.
In each assembly designation the INSULATOR and/or PROTECTING TUBE MATERIAL can be changed from the “commonly used” combination to fit your particular requirements. For example, if the above assembly was required with Alumina 997 for the No. 1 protecting tube, the part number would change from D176C-S-24 to: D177C-S-24.
Of course, the thermocouple type and length must reflect the proper requirements of your application.
For each assembly designation, a parts list for replacement components is given opposite the assembly sketch. If the material of the insulator and/or tube is changed from the “commonly used” combination, the material code must be changed in the replacement components when ordering or specifying these replacement components.
If you need any additional information please contact us.