Straight line thermocouple assemblies with ceramic protection tube and mineral-insulated gauge slides (15-TKM) are used for common temperature measurement up to 1200°C, mainly in gaseous media.
For sensors of this product line, mainly base metal thermocouples are employed, combining the advantages of mineral-insulated gauge slides on one hand, and the advantages of technical ceramics on the other hand.
The individual properties of the most common ceramic types can be found on page 63, in the chapter “Technical Information”. Additionally and in contrast to thermocouples, mineral-insulated gauge slides are easily exchangeable, they are resilient to temperature changes, vibration and impact resistant. In consequence of the compact and slender configuration of the mineral-insulated gauge slides, enough space usually remains to allow for the insertion of an additional mineral insulated thermocouple for measurement verification if necessary.
During measurement and control processes, often high operational wear occurs due to corrosion and abrasion, which even high grade metal protective tubes are not able to withstand. In these scenarios, thermal sensors with protective tubes made of heat-resistant, technical ceramics allow for increased holding time in many instances.
Thermoelectric voltages and tolerances of our mineral-insulated gauge slides are pursuant to DIN EN 60584, Class 1.
Characteristics of the most usual ceramic types
| Unit | porous Ceramic |
TE- Porcelain |
Aluminium Oxide |
|
|---|---|---|---|---|
| Type pursuant DIN | / | C530 | C610 | C799 |
| Thermal Shock Resistance | / | Very Good |
Moderate |
Moderate |
| Impermeability | / | Porous | Gas-Tight | Gas-Tight |
| Maximum Constant Temperature | °C | 1650 | 1600 | 1850 |
| Al2O3-Content | % | 73-75% | 60 | 99,7 |
| Volume Weight | g*m3 | 2,35 | 2,5 | 3,8-3,93 |
| 3-Point Bending Strength | MPa | 35 | 120 | 300 |
| C-Modul | GPa | 60 | 110 | 370 |
Maximum application temperatures for Platinum-Rhodium-Platinum thermoelectric pairs
| Type | Diameter | Maximum Temperature |
|---|---|---|
| S | 0,35 mm | 1350°C |
| S | 0,50 mm | 1600°C |
| R | 0,35 mm | 1350°C |
| R | 0,50 mm | 1600°C |
| B | 0,35 mm | 1600°C |
| B | 0,50 mm | 1800°C |
Application Examples for Thermocouple Assemblies with Ceramic Protection Tube and Mineral-Insulated Gauge Slide
Choose your language
Leave your number and we’ll call you back
Your direct contact to our team
GÜNTHER GmbH
Temperaturmesstechnik
Bauhofstraße 12
D-90571 Schwaig
info@guenther.eu
Tel. +49 (0)911 / 50 69 95-0
Fax +49 (0)911 / 50 69 95-55