Ceramic Protection Tubes

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

For further informations please download our Product Informtion Straight TC

Abb.1
 


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


  • 1) d1 must be maintained over a length of 20 mm with an permitted deviation of +/- 0.5 mm.
  • 2) 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.
  • 3) At temperatures above approx. 1000 °C gas-tightness can no longer be assumed.
  • 4) 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.
  • 5) Type AKK: inner protection tube 6 x 1
  • 6) Type AKK: inner protection tube 10 x 2
  • 7) Type AKK: inner protection tube 15 x 2.5