Ceramic Protection Tube Sensor Assemblies

Ceramic Protection Tube Sensor Assemblies are great solutions for high temperature applications common to metals manufacturing, heat treating and other high temperature applications where metallic constructions simply will not hold up. Alumina materials can be used at 3400°F (1870°C) and are frequently assembled with Noble metal thermocouple types (R, S, B, Platinel, etc.). They are somewhat gas tight, sensitive to thermal shock and can crack if one end of the tube is heated at a different rate than the other. Mullite materials can be used at 3100°F (1700°C) are typically used with base metal thermocouple types (ex: K, N, J, E). Hexoloy materials will not slump at temperatures up to 3000F (1650°C) and are often used in high temperature corrosive and erosive applications where chemical resistance and a greater resistance to thermal shock is desired.

If desired, wake frequency calculations per ASME/ANSI PTC 19.3TW can be performed on these products using JMS’s free SwiftyCalc software.

Cut Sheet
Technical Information
White Papers
Resources

Cut Sheet
Technical Information
White Papers
Resources

Sensor Type
Sheath Material
Ceramic Materials

Thermocouple Types

Thermocouple Type	Material	Magnetic	ASTM Color Coding	IEC Color Coding
J	Iron Constantan	Yes No	White Red	White Black
T	Copper Constantan	No No	Blue Red	White Brown
K	Chromel Alumel	No No	Yellow Red	White Green
E	Chromel/Constantan	No No	Purple Red	White Violet
P	Platinel	N/A	N/A	N/A
S	Platinum 10% Rhodium Pure Platinum	No No	Black Red	White Orange
R	Platinum 13% Rhodium Pure Platinum	No No	Black Red	white Orange
B	Platinum 30% Rhodium Platinum 6% Rhodium	No No	Grey Red	White Grey
N	Nicrosil/Nisil	No Slightly	Orange Red	White Pink
C	Tungsten 5% Rhenium/ Tungsten 26% Rhenium	No No	White Red	N/A

RTD Standards

Organization	Standard	Alpha	Nominal Resistance(ohms) At 0°C
American Scientific Apparatus Makers Association (SAMA)	RC21-4-1966	0.003923	98.129
British Standards Association	b.S. 1904-1964	0.003850	100
Normenstelle Elektrotechnik	DIN 43760	0.003850	100
International Electrotechnical Commission (Supersedes BS&DIN)	IEC 751: 1983	0.003850	100
US Department of Defense	MIL-T-24388	0.00392	100

Material Symbol	Sheath Material	Melting Point(°F)	Max Temp; In Air(°F)	Atmosphere^*
H	304 SS	2550	1650	ORNV
J	310 SS	2550	2100	ORNV
L	316L SS	2550	1650	ORNV
O	446 SS	2700	2100	ORNV
M	Inconel 600	2500	2100	ONV
P	Inconel 702	2620	1500	ONV
Q	Platinum	3216	3000	ON
R	Molybdenum	4750	1000	VNR
T	Titanium	3300	600	V
V	STABALOY	2552	2220	ORNV

^*KEY

O=Oxidizing, R=Reducing, N=Neutral, V=Vacuum

Name	Material	Used At
Alumina	Aluminum Oxide Ceramic	3400°F (1870°C)
Mullite	Alumina and Silica (Silicon Carbide)	3100°F (1700°C)
Hexaloy SE	Sintered Alpha Silicon Carbide	3000°F (1648°C)