The tolerance of the outer diameter specifies the permissible range within which the actual diameter may deviate from the nominal value. It is a key factor in the manufacturing accuracy and technical suitability of the thermocouple.
The outer diameter determines whether the thermocouple can be precisely integrated into the respective application. Safe and precise use is only guaranteed if the specified nominal values and limit dimensions are adhered to.
The nominal value defines the intended outer diameter, while the limit dimensions specify the permissible tolerance range. Together, these specifications determine the dimensional design of the thermocouple and are particularly important for industrial applications where dimensional accuracy, reliability, and compliance with standards are critical.
Tolerance of outer diameter
| Outer diameter of thermocouple (Ø in mm) | nominal value +/- limit dimensions |
|---|---|
| 0,5 mm | +/- 0,025 mm |
| 1,0 mm | +/- 0,025 mm |
| 1,5 mm | +/- 0,025 mm |
| 2,0 mm | +/- 0,025 mm |
| 3,0 mm | +/- 0,030 mm |
| 4,5 mm | +/- 0,045 mm |
| 6,0 mm | +/- 0,060 mm |
| 8,0 mm | +/- 0,080 mm |
Thermocouple type "Form A" / "Form B":
Mineral insulated thermocouples listed in this catalogue are according to DIN EN 61515 with regard to shape, construction and geometrical dimensions or refer to it. Regarding the basic values and tolerances the standards DIN EN 60584-1 and DIN EN 60584-2. We furnish mineral insulated thermocouples with insulated hot junction (form A) as standards version acc. to DIN EN 61515.
Thermocouple Form A - ungrounded mineral insulated thermocouple
The measuring tip is not directly welded to the bottom. We also manufacture grounded mineral insulated thermocouples (form B) acc. to DIN EN 61515. Mineral insulated thermocouples keep the given min. insulation resistance acc. to DIN EN 61515 of ≥1000 MΩ at room temperature.
Thermocouple Form B - grounded mineral insulated thermocouple
The measuring tip is electrically connected to the sheath.
You can find more information about temperature measurement technique here.
If you have further questions or feedback please contact the SAB-Team.