70 / 204
Example:
The part number
8K6-P11F-18-24-SH
signifies an angle assembly, 8 gauge, Type K, 18”
P11F
11/16” O.D. Mullite tube
hot leg, 1/2” x 3/4” steel fitting, 24” cold leg 3/4” NPT balance pipe, and a Standard Head (
SH
). Other combinations of thermocouples and ce-
ramic tubes can be specified depending on your application.
!
Note:
If you would like to order a Type E, J, or N assembly, just substitute the “
K
” with an E, J, or N in the part numbers listed on this
page.
If you would like to order a Type B, R, or S, just substitute the “
K”
with a B, R, or S. and “24” for the “8” in the part number. We also offer other
types of ceramic tubes, such as Aluminum or Zirconia See the ceramic tube section of this catalog if you would like to specify a different type
of protection tube on your assembly.
Typical Application
Photo
Protection Tube
Gauge
Type K
Mullite
63.5% Aluminum Oxide,
Balance Silicon Dioxide
Mullite has a maximum service temperature of 2900°F
(1590°C). It is considered to be better than Alumina for
thermal shock resistance. Mullite tubes should be used
with care, since they have poor mechanical shock
resistance. Secondary metal tubes can be added for
protection from mechanical damage. Mullite tubes are
considered gas tight at high temperatures. All tubes
which are used in horizontal installations and at elevat-
ed temperatures should be supported. Mullite tubes
should not be used for primary protection tubes on no-
ble metal (platinum based) thermocouples.
1
Mullite Porcelain
Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel Fitting.
8
8K6-P11F-H-C-SH
Silicon Carbide
90.0% Silicon Carbide, 9% Silicon Dioxide
Silicon Carbide has a maximum service temperature of
2730°F (1500°C). It has excellent resistance to thermal
shock and the cutting action of flames. However, silicon
carbide tubes are porous so they should not be used if
a gas tight seal is required for protection of the thermo-
couple element. Because of their porosity, silicon car-
bide is usually used a the secondary thermocouple
protection tube. The SCI type silicon carbide tubes are
isopressed around a steel inner protection tube. This
creates a gas tight unit, which is then considered a non-
porous tube.
2
Silicon Carbide
Single tube, O.D. 1 3/4” (44.5 mm)
2.0” NPT Machined Steel Bushing.
8
8K6-SCB-H-C-SH
3
Silicon Carbide
Single tube, O.D. 2.0” (50.8 mm),
Isopressed over a 1/2” NPT steel pipe.
8
8K6-SCI12-H-C-SH
3
Silicon Carbide
Single tube, O.D. 2.0” (50.8 mm),
Isopressed over a 3/4” NPT steel pipe.
8
8K6-SCI34-H-C-SH
4
Silicon Carbide
Single tube, O.D. 1 3/4” (44.5 mm)
FSC2412 cast iron fitting, 3 stainless
steel screws.
8
8K6-SCF-H-C-SH
Alumina Silica
41.3% Silicon Dioxide, 39.4% Aluminum Oxide,
9.4% Calcium 6.3% Iron oxide, 3.8% Other
Slip cast Alumina Silica refractory tubes have a
maximum service temperature of 1500°F (815°C).
These tubes are constructed by casing the refractory
material around a 1/2” steel protection tube. Alumina
Silica refractory tubes are used in molten Zinc and
Aluminum die casting applications. They have excellent
thermal shock and mechanical damage resistance.
They are non-wetting and will not contaminate the
molten metal as a stainless steel or iron protection tube.
5
Alumina Silica
Single tube, O.D. 2.0” (50.8 mm),
Cast over a 1/2” NPT steel protection
tube.
Note:
If you would like to order a 316
Stainless Steel inner protection tube,
substitute the “
AS
” with “
ASSS
” in the
part number.
8
8K6-AS-H-C-SH
Hot leg of thermocouple = H. Cold leg of thermocouple = C. Multiples of 6” (152.4 mm) starting at 12” are in stock.
Notes:
*
= Probe length in figures shown. The steel Balance Pipe on Types B, R, and S assemblies are 1/2” pipe size.
Angle Assemblies - Ceramic Tubes - Types B, E, J, K, N, R, & S
Page 70
Phone: 617.527.4385 Fax: 617.964.3746 Email:
sales@asrichards.com