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The Richards Double Tube Thermocouple Assemblies are designed for severe service applications. 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 problem. 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 E, J, or Type N assembly, just substitute the K with an E, J, or N in the part numbers listed on this
page. Triple tube assemblies are also available.
Primary Tube
(Inner)
Secondary Tube
(Outer)
Wire
Gauge
Type K
1
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.
#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
8
14
8K5-P11F-734XH-*
14K5-P11F-734XH-*
2
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
8
14
8K5-P11F-934-*
14K5-P11F-934-*
3
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.
14
20
14K5-P06-P11F-*
20K5-P06-P11F-*
4
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 11/16” (17.5 mm)
Cemented
Mullite Porcelain
63.5% Aluminum Oxide. Balance Silicon Dioxide
Construction: Single tube, O.D. 1” (25.4 mm)
3/4” x 1” NPT steel fitting.
8
14
8K5-P11-P16F-*
14K5-P11-P16F-*
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.
CIXH (Cast Iron Extra Heavy)
Extra Heavy wall, Cast Iron Tube
Construction: Single tube, O.D. 1.63” (41.1 mm)
8
14
8K5-P11F-CIXH-*
14K5-P11F-CIXH-*
6
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.
CIXHCBG (Cast Iron Extra Heavy Coated)
Extra Heavy wall, Coated Cast Iron Tube
Construction: Single tube, O.D. 1.63” (41.1 mm)
8
14
8K5-P11F-CIXHCG*
14K5-P11F-CIXHCG*
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
8
14
8K5-P11F-SCB-*
14K5-P11F-SCB-*
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
8
14
8K5-P11F-SCF-*
14K5-P11F-SCF-*
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)
8
14
8K5-P11F-SCI34-*
14K5-P11F-SCI34-*
* Add required thermocouple length. Multiples of 6” (152.4 mm) starting at 12” are in stock.
Straight Assemblies - Double Tube -Types E, J, K & N - Screw Cover Head
Page 24
Phone: 617.527.4385 Fax: 617.964.3746 Email:
sales@asrichards.com