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The Richards Double Tube Thermocouple Assemblies are designed for severe service applications and molten glass furnaces. The double
tube assemblies with a metal outer tube are for applications where mechanical damage and thermal shock to the thermocouple is a problem.
The double tube assemblies, which have a Silicon Carbide outer tube, are for applications where thermal shock and flame contact is a prob-
lem. Double ceramic tube assemblies are for extra protection against corrosive atmospheres. We offer many other combinations of double
tubes, which we could not list in this catalog due to space limitations. Richards double tube assemblies can be made from any type of metal or
ceramic tube, which is available.
!
Note:
If you would like to order a Type B, or Type R assembly, just substitute the S with a B or R in the part numbers listed on th is
page. Triple tube assemblies are also available.
Primary Tube
(Inner)
Secondary Tube
(Outer)
Wire
Gauge
Type K
1
Alumina
98.8 Aluminum Oxide
Construction: Single tube, O.D. 3/8” (9.5 mm)
Cemented.
Alumina
98.8 Aluminum Oxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
24
24S5-AP06-AP11F-*-SH
2
Alumina
98.8 Aluminum Oxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
Cemented.
Alumina
98.8 Aluminum Oxide
Construction: Single tube, O.D. 1” (25.4 mm)
3/4” x 1” NPT steel fitting.
24
24S5-AP11-AP16F-*-SH
3
Alumina
98.8 Aluminum Oxide
Construction: Single tube, O.D. 1” (25.4 mm)
3/4” x 1” NPT steel fitting.
Silicon Carbide
90.0% Silicon Carbide, 9% Silicon Dioxide
Construction: Single tube, O.D. 1 3/4” (44.5 mm)
2.0” NPT Machined Steel Bushing
24
24S5-AP11F-SCB-*-SH
4
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
Cemented
#7 Seamless Stainless Steel (446)
Chromium 23-27%, Manganese 1.5% Silicon 1%,
Nitrogen .25%, Carbon 2%, Sulphur .030%,
Phosphorous .040%, Iron (Balance)
Construction: 3/4” pipe, Extra Heavy, Schedule 80
24
24S5-P11F-734XH-*-SH
5
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
#9 Seamless Stainless Steel Alloy (600)
Nickel 76%, Chromium 15.5%, Iron 8%,
Manganese .5%, Silicon .2%, Copper .2%,
Carbon .08%
Construction: 3/4” pipe, Schedule 40
24
24S5-P11F-934-*-SH
6
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 3/8” (9.5 mm)
Cemented
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
24
24S5-P06-P11F-*-SH
7
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
Silicon Carbide
90.0% Silicon Carbide, 9% Silicon Dioxide
Construction: Single tube, O.D. 1 3/4” (44.5 mm)
2.0” NPT Machined Steel Bushing
24
24S5-P11F-SCB-*-SH
8
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
Silicon Carbide
90.0% Silicon Carbide, 9% Silicon Dioxide
Construction: Single tube, O.D. 1 3/4” (44.5 mm)
FSC1216 cast iron fitting and 3 stainless steel
screws
24
24S5-P11F-SCF-*-SH
9
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
1/2” x 3/4” NPT steel fitting.
Silicon Carbide
90.0% Silicon Carbide, 9% Silicon Dioxide
Construction: Single tube, Isopressed over a 3/4”
NPT steel pipe. O.D. 2.0” (50.8 mm)
24
24S5-P11F-SCI34-*-SH
* Add required thermocouple length. Multiples of 6” (152.4 mm) starting at 12” are in stock.
Straight Assemblies - Double Tube -Types B, R, & S - Standard Head, Aluminum
Page 28
Phone: 617.527.4385 Fax: 617.964.3746 Email:
sales@asrichards.com