2.1) Straight Thermocouples with Ceramic Protection Tube

Type AK Type BK Type AKK Type BKK
Connection headForm A Form B Connection headForm A Form B SupporttubeOuter protectiontube Ceramic Support tube Outer protectiontube Ceramic Inner protection tube Ceramic Code for straight thermocouples AK/AKK BK BKK Connection head Form A B Support tube, galv. plated steel or on request d
2 x s / l
2 32 x 2 / 200 22 x 2 / 150 15 x 2 / 80 or 22 x 2 / 80 C 530 26 x 4 - - Ceramic outer protection tube C 799 24 x 3 15 x 2.5 15x2.5/10x2 15x2.5/10x2 C 610 24 x 2.5 15(16) x 2 15x2/10x1.5 15x2/10x1.5 Protection tube d
1 1 x s ) Ceramic inner protection tube C 610 15(16) x 2 10 x 1.5 - -
Types AKK and BKK only C 799 15 x 2.5 10 x 2 - 10x2/6x1 Identification letter Diameter E, J (L), K, N
* ) 3.0 1 TP - - - - - - - E, J (L), K, N
* ) 2.5 1 TP 2 TP 1 TP 2TP
3 ) 1 TP 2TP
3 ) - -
1 TP=1 thermocouple 2 TP=2 thermocouples E, J (L), K, N
* ) 1.38 1 TP 2 TP 1 TP 2 TP 1 TP 2 TP - -
Thermocouple acc. to EN 60 584 Insulation rod acc. to EN 50 113 E, J (L), K, N
* ) 1.0 1 TP 2 TP 1 TP 2 TP 1 TP 2 TP - -
* ) Thermocouple(s) preferably form A or B acc. to EN 50 113 R, S, B, W5
** ) 0.5; 0.35 1 TP 2 TP 1 TP 2 TP 1 TP 2 TP 1 TP 2TP
4 )
** )
Thermocouple(s) form C or D acc. to EN 50 113; W5 not according to EN 50 113 and only in 0.5 mm diam. - 355
Nominal length NL Note: for nominal lengths of 2000 mm and more an additional support must be provided by the user in the case of horizontal mounting. Types AK, AKK: special lengths up to 2500 mm on request. 500 500 710 710 710
5 ) 1000 1000 1000
5 ) 2000 1400 -
2 ) -
1) s = wall thickness of the support tube resp. protection tube 2) This nominal length with built-in precious-metal thermocouple is not suitable for vertical mounting. 3) 2 thermocouples cannot be installed in ceramic outer or inner protection tubes 10 x 2 . 4) Only 2 thermocouples of 0.35 mm dia. can be installed. 5) Type only available with outer protection tube diam. of 15 mm

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