Accessories

Metal Protection Tubes

Metal protection tubes are supplied in forms A, B and C.

Standard nominal lengths are 355 mm, 500 mm, 710 mm and 1000 mm. Other nominal lengths like 250 mm, 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: A22Dx1020

Dimensions and permitted deviations for metal protection tubes without bushing
Form	d +0,2/-0,1	s +/-0,1	For straight thermocouples with a nominal length I
			250	355	500	710	1000	1400	2000
			Prot. tube length l 3 Permitted deviation +3.0/-0					Prot. tube length l 3 Perm. deviation +5.0/-0
A / C	15	2	265	370	515	-	-	-	-
	22	2	-	-	520	730	1020	1420	2020
	24	3	-	-	520	730	1020	1420	2020
B	22	2	-	-	-	-	1020	1420	2020

Identification letter for metal protection tubes
Ident. Letter	Short name	Material No.
BF	St 35.8	1.0305
BL	C 22.8	1.0460
J	X6CrNiMo 17 - 12-2	1.4571
DU	x18CrNi28	1.4749
R	x10CrAl24	1.4749
DU	x15CrNiSi2520	1.4841
B	Inconel 600	2.4816
Y	Inconel 800	1.487
CS	Kanthal Super/AF/APM 1	-

Identification letter for thermocouples
Ident. Letter	Thermocouple DIN EN 60 584-1
E	NiCr-CuNi
J	Fe-CuNi
K	NiCr-Ni
N	NiCrSi-NiSi
S	Pt 10%Rh-Pt
R	Pt 13%Rh-Pt
B	Pt30%Rh-Pt6%Rh
L	Fe-CuNi (DIN 43 710)³
D (Ao)	W3%Re-W25%Re
C 4 (AE)	W5%Re-W26%Re
A 4	W5%Re-W20%Re

1) Differing diameter
2) Please ask for detailed specifications
3) Standard withdrawn 07/97

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