General
Notes
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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" page for material selection parameters.
The
part numbers shown are for "Commonly used" assemblies. Please
consult the factory for information regarding additional assemblies.
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 consult the factory.
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 consult the factory.
- Click Here!
TABLE
A |
Marlin
Code |
Insulator
Material |
6 |
Mullite
60
|
7 |
Alumina
997
|
8 |
Alumina
998
|
Note: Insulator material Àº °í°´ÀÇ »ç¾ç¿¡ µû¶ó ¹Ù²ð ¼ö ÀÖ½À´Ï´Ù
TABLE
B |
Marlin
Code |
Protecting
Tube Material |
6 |
Mullite
60
|
7 |
Alumina
997
|
8 |
Alumina
998
|
A |
SA
Silicon Carbide
|
C |
Silicon
Carbide
|
L |
Metal
Ceramic
|
I |
Inconel
|
Note: Insulator material Àº °í°´ÀÇ »ç¾ç¿¡ µû¶ó ¹Ù²ð ¼ö ÀÖ½À´Ï´Ù
TABLE
C |
Thermocouple
Type
ITS-90/IPTS 1968 |
Single
Element |
Dual
Element |
Pt13%Rh
vs Pt |
R
| R2
|
Pt10%Rh
vs Pt |
S
| S2
|
Pt30%Rh
vs Pt6%Rh |
B
| B2
|
Thermocouple
Type
IPTS 1948 |
Single
Element |
Dual
Element |
Pt13%Rh
vs Pt |
4R
| 4R2
|
Pt10%Rh
vs Pt |
4S
| 4S2
|
For
more information regarding Platinum Thermocouple Assemblies,
Please
consult your Marlin Catalog, Pages C-64 to C-71.
|