Thermocouple Assemblies

Thermocouple Assemblies

Noble Metal Thermocouples

Roxspur Measurement and Control offer Type-R, S and B thermocouples in a variety of wire diameters ranging from 0.15mm to 0.50mm (larger diameters may also be available). Thermocouples can be supplied as bare wire elements, ceramic insulated elements or sheathed thermocouple assemblies.

Ceramic Insulators

Element wires are insulated with recrystallised alumina insulators as standard. The insulator is normally a single continuous piece however shorter sectional insulating beads can be fitted if preferred.

Thermocouple Assemblies

The thermocouple elements are supplied fitted into ceramic closed end protection sheaths which in turn can then be fitted into a high temperature steel sheath if required. A wide range of thermocouple connection heads are available to complete the assembly.

Ceramic Protection Sheaths

RM&C offer ceramic closed end sheaths in aluminous porcelain, recrystallised alumina or silicon carbide. Aluminous porcelain is recommended for temperatures up to 1,400ºC and recrystallised alumina for temperatures up to 1,700ºC. Silicon carbide is recommended for temperatures up to 1,450ºC and is normally used as an outer protection sheath which requires an inner porcelain or alumina sheath to protect the element.

Metal Protection Sheaths

RM&C offer a number of high temperature steels for use as either closed end protection sheaths or as sockets to fix ceramic sheaths to connection heads. Stocked materials include stainless steels in 216 and 310 grades, inoconel 600 and 601, chrome/iron stainless steel 446 and sandvik 253MA nickel chrome. Where a metal protection is used, a ceramic inner sheath is normally used.

Process Connections

Flanged and threaded process fittings are available in carbon steel and stainless steel. These can be supplied as adjustable fittings or fixed welded. Cast iron adjustable flanges are also available.

 

TERMINATION HEADS

Ceramic terminal blocks are fitted as standard to all heads.

Standard Single HeadGeneral purpose die cast aluminium alloy head with hinged lid.
Weatherproof Single HeadCast aluminium alloy head for outside applications and where liquid or moisture ingress is a problem. Incorporating threaded lid, seal, ¾" BSP process thread and 20mm ISO cable entry. The weatherproof single head is also available in cast iron.



PROCESS CONNECTIONS

Fixed Welded Process AdaptorsAvailable in carbon steel and stainless steel with parallel or tapered thread.
Adjustable Process AdaptorsAvailable in carbon steel and stainless steel with parallel or taper thread.
Flanges - Fixed WeldedAvailable in carbon steel and stainless steel to customer specifications.
Flanges - Adjustable Standard Sizes3" (76.20mm) cast iron
4" (101.60mm) cast iron 
5" (127.00mm) cast iron


METAL PROTECTION SHEATHS

Inner impervious refractory sheath fitted on all noble metal thermocouples. Temperature limits subject to operational environment and thermocouple element type.

253 Cr Ni REM
1,100ºC temperature limit
3/4" NB x SCH 40 (26.67 x 20.93)
1/2" NB x SCH 40 (21.34 x 15.80)
5/8" OD x 1/2" ID (15.87 x 12.70)
54 Cr Fe
1,150ºC temperature limit
3/4" NB x SCH 40 (26.67 x 20.93)
1/2" NB x SCH 40 (21.34 x 15.80)
1/2" OD x 1/4" ID (12.70 x 6.35)
600 Ni Cr Fe
1,150ºC temperature limit
1" OD x 3/4" ID (25.40 x 19.05)
1/2" NB x SCH 40 (21.34 x 15.80)
5/8" OD x 1/2" ID (15.87 x 12.70)
1/2" OD x 3/8" ID (12.70 x 9.52)
Stainless Steel
Available in diameters:
3/8" to 1 1/4" (9.5mm to 32mm)

 
601 Ni Cr Fe Al
1,250ºC temperature limit
1" OD x 3/4" ID (25.40 x 19.05)
 


THERMOCOUPLE ELEMENT

Noble MetalDiameter 
Type-R¹0.15mm0.35mm
0.45mm0.5mm 
Type-S¹0.15mm0.35mm
0.45mm0.5mm 
Type-B²0.15mm0.35mm
0.45mm  
¹Conductors conform to BS EN60584-2:1993 Class 1 tolerance
²Conductors conform to BS EN60584-2:1993 Class 2 tolerance

Also available: Other thermocouple types and insulated elements.

REFACTORY SOCKETS

Sheathed thermocouples only - available in mild steel and heat resisting steel.

2 3/4" diameter (57.15mm)
1 3/8" diameter (34.92mm)
1 5/16 diameter (1" nominal bore) (33.3mm)
1 1/2" diameter (31.75mm)
1 1/16" diameter (3/4" nominal bore) (26.98mm)
3/4" diameter (19.05mm)
5/8" diameter (15.87mm)
1/2" diameter (12.70mm)


REFACTORY PROTECTION SHEATHS

Aluminous Porcelain*
Temperature limit: 1,400ºCSocket Size
20mm OD x 15mm ID3 or 4
17mm OD x 13mm ID5
12mm OD x 8mm ID6
10mm OD x 7mm ID7
8mm OD x 5mm ID8
Recrystalised Alumina
Temperature limit: 1,800ºCSocket Size
20mm OD x 15mm ID3 or 4
17mm OD x 13mm ID5
12mm OD x 8mm ID6
10mm OD x 7mm ID7
8mm OD x 5mm ID8
Silicon Carbide
Temperature limit: 1,450ºCSocket Size
50mm OD x 25mm ID1
31mm OD x 15mm ID2
25mm OD x 15mm ID2 or 3

Temperature limit subject to operational environment and thermocouple element type.

* Not recommended above 1,200ºC for noble metal thermocouples.

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-Brearley Thermocouple AssembliesMade to Order

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