Accessories
Ceramic protection tubes are supplied only in form A.
Standard nominal lengths are 355 mm, 500 mm, 710 mm and 1000 mm. Other nominal lengths like 1400 mm and 2000 mm are available on request.
The ordering code of this product is composed of its form, dia., identification letters of the material number and protection tube length. Please refer to our Product Information "Straight Thermocouples" regarding the relation between protection tube length and nominal length.
Example: A15CZ-1030
d1 1) | s min | For straight thermocouples model AK, AKK, BK und BKK | Protection tube material | Temperature shock resistance | Tightness 3) | Permitted permanent temperature in °C 2) | |||||
355 | 500 | 710 | 1000 | 1400 | 2000 | ||||||
Protection tube length l 3 | |||||||||||
Permitted deviation +3 / -0 | Perm. Deviation +5 / -0 | ||||||||||
10 | 1,5 | 375 | 520 | 730 | 1020 | - | - | C 610 (K610) | Medium to good | Gas-tight | 1500 |
15/16 | 2 | - | 530 | 740 | 1030 | 1430 | - | ||||
24 | 2,5 | - | 530 | 740 | 1030 | 1430 | 2030 | ||||
10 | 2 | 375 | 530 | 740 | 1030 | - | - | C 799 (K710) | Medium to good | Gas-tight | 1600 |
15/16 | 2,5 | - | 530 | 740 | 1030 | 1430 | - | ||||
24 | 3 | - | 530 | 740 | 1030 | 1430 | 2030 | ||||
26 | 4 | - | - | 740 | 1030 | 1430 | 2030 | C 530 | Very good | Porous | 1500 |
20 5) | 5 | - | 530 | 740 | 1030 | 1430 | - | SiSiC 4) | Very good | Gas-tight | 1350 |
22 6) | 5 | - | 530 | 740 | 1030 | 1430 | 2030 | ||||
25 6) | 5 | - | 530 | 740 | 1030 | 1430 | 230 | ||||
20 6) | 3,5 | - | 530 | 740 | 1030 | 1430 | - | RSiC 4) | good | Gas-tight | 1600 |
22 6) | 3,5 | - | 530 | 740 | 1030 | 1430 | 2030 | ||||
25 7) | 3,5 | - | 530 | 740 | 1030 | 2030 |
Identification letter for ceramic protection tubes | |
Ident. Letter | Material acc. to DIN EN 60 672 Old norm VDE 0335 Part 1 |
CX | C 530 / K 530 |
CY | C 610 / K 610 |
CZ | C 710 / K 710 |
RSiC | Silicon carbide, recrysallized ² |
SiSiC | Silicon carbide, recrysallized ² |
d1 must be maintained over a length of 20 mm with an permitted deviation of +/- 0.5 mm.
Noble-metal thermocouples are predominantly used for measuring temperatures above 1000 °C. When installed in protection tubes and insulation rods made from the above indicated ceramic insulation materials, it has to be taken into account that in a reducing atmosphere the thermocouples may be affected. Of particular influence and reducing the admissible permanent temperature are silicon and heavy metals.
At temperatures above approx. 1000 °C gas-tightness can no longer be assumed.
When using SiC protection tubes type AK only non-precious-metal thermocouples should be installed. With type AKK the installation of an inner protection tube made of C 799 is strongly recommended when having noble-metal thermocouples.
Type AKK: inner protection tube 6 x 1
Type AKK: inner protection tube 10 x 2
Type AKK: inner protection tube 15 x 2.5
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