Richards Thermocouple and Temperature Sensor Catalog 16

Angle Assemblies - Ceramic Tubes - Types B, E, J, K, N, R, & S

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. 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. 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. Silicon Carbide 90.0% Silicon Carbide, 9% Silicon Dioxide

Mullite Porcelain Single tube, O.D. 11/16” (17.5 mm) 1/2” x 3/4” NPT steel Fitting.

1

8

8K6-P11F-H-C-SH

Silicon Carbide Single tube, O.D. 1 3/4” (44.5 mm) 2.0” NPT Machined Steel Bushing. Silicon Carbide Single tube, O.D. 2.0” (50.8 mm), Isopressed over a 1/2” NPT steel pipe. Silicon Carbide Single tube, O.D. 2.0” (50.8 mm), Isopressed over a 3/4” NPT steel pipe. Silicon Carbide Single tube, O.D. 1 3/4” (44.5 mm) FSC2412 cast iron fitting, 3 stainless steel screws. Alumina Silica Single tube, O.D. 2.0” (50.8 mm), Cast over a 1/2” NPT steel protection tube.

8K6-SCB-H-C-SH

2

8

3

8

8K6-SCI12-H-C-SH

3

8

8K6-SCI34-H-C-SH

4

8

8K6-SCF-H-C-SH

5

8

8K6-AS-H-C-SH

Note: If you would like to order a 316 Stainless Steel inner protection tube, substitute the “ AS ” with “ ASSS ” in the part number.

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.

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Phone: 617.527.4385 Fax: 617.964.3746 Email: sales@asrichards.com