Very High Temperature Thermocouple Probes

XTA, XMO, XPA, XIN Series

Sheaths
• Tantalum
• Molybdenum
• Platinum/Rhodium
• Inconel 600
Thermocouple Elements
• Tungsten/Rhenium
• Platinum/Rhodium
Insulations
• Hafnium Oxide (HfO₂)
• Magnesia (M_gO)
• Alumina (Al₂O₃)
Mating Connector Sold Separately

Thermocouples - View related products

Description

OMEGA™ Exotic Thermocouple Probes are designed for use in extreme temperatures, up to 2315°C (4200°F). These probes utilize either Platinum/Rhodium (types R, S, or B) or Tungsten/Rhenium (types G, C, or D) elements, with a variety of insulations and sheath materials. Depending upon the sheath material selected, these probes may be used in inert, oxidizing, reducing or vacuum conditions. The maximum temperature is based on the lowest max. temperature of the element, insulation and sheath material. Five cold end probe terminations are available: replacement probe, subminiature or standard size ceramic connector, heavy-duty standard size, molybdenum-sheathed nylon connector, or transition joint with 2 metre long lead wire.

Sheath Materials

Code	Material	Max. Operating Temp.	Working Environment	Approx. Melting Point	Remarks
XTA	Tantalum	2300°C 4200°F	Vacuum	3000°C 5425°F	Resists Many Acids and Weak Alkalies. Very Sensitive to Oxidation Above 300°C
XMO*	Molybdenum	2200°C 4000°F	Inert Vacuum Reducing	2610°C 4730°F	Sensitive to Oxidation Above 200°C Non-bendable
XPA	Platinum- Rhodium Alloy	1650°C 3000°F	Oxidizing Inert	1870°C 3400°F	No Attack by SO2 at 1100°C. Silica Is Detrimental. Halogens Attack at High Temp.
XIN	Inconel 600	1150°C 2100°F	Oxidizing Inert Vacuum	1400°C 2550°F	Excellent Resistance to Oxidation at High Temp. Hydrogen Tends to Embrittle. Very Sensitive to Sulphur Corrosion

*Refractory metals are extremely sensitive to any trace of oxygen above approximately 260°C
(500°F). Must be used in vacuum or in very pure inert gases such as Hellium or Argon.

Insulation Materials

Code	Material	Max. Operating Temp.**	Approx. Melting Point	Remarks
H	Hafnia (HfO₂)	2500°C 4530°F	2830°C 5125°F	Nontoxic substitute for BeO. High Thermal Conductivity.
M	Magnesia (M_gO)	1650°C 3000°F	2790°C 5050°F	Hygroscopic. Compacts Well.
A	Alumina (Al₂O₃)	1540°C 2800°F	2010°C 3650°F	Requires Considerable Volume Reduction to Compact Satisfactorily.

Note:
For temperatures above 1000°C (1800°F), all insulating materials experience a
substantial decrease in resistivity with increasing temperatures.

** Values given are for compacted insulation. For uncompacted hard-fired insulators,
useful temperature range can be 40 to 90°C (100 to 200°F) higher.
Molybdenum sheathed probes are not recommended in applications where they will be
exposed to carbon, including graphite.

For Graphite environments, Consult Omega's Sales Department for Pricing and Delivery on Tungsten Coated Molybdenum sheathed T hermocouples.

Termination Style Q
Type OGP heavy-duty, colour-coded male and female connectors.
Termination Style TJ
Heavy-duty transition termination with 2 metre long leads.
Termination Style HX
Type NHX high temperature ceramic male and female connectors with colour identification dot.
Termination Style SX
Type SHX miniature high temperature ceramic male and female connectors with colour identification dot.
Termination Style RP
Replacement probe style with 25mm long bare wire leads.

Calibration¹	Atmosphere² Max.Temp³	Model Number
C W-5% Re vs. W-26% Re	V. 2300°C 4200°F	XTA-W5R26-U-062-30-H--* XTA-W5R26-U-125-30-H--* XTA-W5R26-U-125-24-H--*
R* Pt-13% Rh vs. Pt	V. 1475°C 2700°F	XTA-P13R-U-062-30-M--* XTA-P13R-U-125-24-M--* XTA-P13R-U-062-30-H--* XTA-P13R-U-125-24-H--*
C W-5% Re vs. W-26% Re	I.V.R. 2200°C 4000°F	XMO-W5R26-U-125-30-H--* XMO-W5R26-U-250-30-H--*
C W-5% Re vs.W-26% Re	I.V.R. 1540°C 2800°F	XMO-W5R26-U-250-30-A--* XMO-W5R26-U-062-40-A--* XMO-W5R26-U-125-30-A--*
R* Pt-13% Rh vs. Pt	I.V.R. 1480°C 2700°F	XMO-P13R-U-125-30-A--* XMO-P13R-U-250-24-A--*
C W-5% Re vs. W-26% Re	O.I.V. 1540°C 2800°F	XPA-W5R26-U-125-30-A--*
R* Pt-13% Rh vs. Pt	O.I.V. 1480°C 2700°F	XPA-P13R-U-062-30-M--* XPA-P13R-U-125-24-M--* XPA-P13R-U-125-30-A--*
C W-5% Re vs. W-26% Re	O.I.V. 1150°C 2100°F	XIN-W5R26-U-062-30-M--* XIN-W5R26-U-125-30-M--*
R* Pt-13% Rh vs. Pt	O.I.V. 870°C 1600°F	XIN-P13R-U-062-30-M--* XIN-P13R-U-125-30-M--* XIN-P13R-U-125-24-M--* XIN-P13R-U-187-26-M--* XIN-P13R-U-250-24-M--* XIN-P13R-U-250-20-M--*

* Specify Termination Style: Q, TJ, HX, SX, or RP
** Specify Probe Length in inches

Note 1:	Prices subject to change Please consult the Sales Department for current pricing.
Note 2:	Atmospheres: O-Oxidizing I-Inert V-Vacuum R-Reducing.
Note 3:	Maximum service temperatures shown are for probes with the largest available gauge wire leads. Consult Engineering for ratings of other dimension probes.
Note 4:	Bending: XPA and XIN sheathed probes with platinum elements be bent in the field.
Note 5:	Some probes available in dual configurations. Check with Sales Department.

Place Order(Specify Model Number)

Part Number/ Desc.

Qty

Description

Example part numbers are shown below. Use the box below or contact sales to order specific models

XMO-W5R26-U-125-30-H-HX-6

£324.06

Availability: 6 weeks

Type C Thermocouple. 1/8" dia 6" long molybdenum sheath with Hafnia insulation and standard size ceramic connectors

XMO-W5R26-U-062-40-A-Q-24

£558.71

Availability: 2 weeks

Type C Thermocouple. 1/16" dia 24" long molybdenum sheath with Alumina insulation and standard size plastic connectors

XMO-W5R26-U-062-40-A-Q-36

£746.71

Availability: 6 weeks

Type C Thermocouple. 1/16" dia 36" long molybdenum sheath with Alumina insulation and standard size plastic connectors

XMO-W5R26-U-062-36-H-SX-12

£494.60

Availability: 6 weeks

Type C Thermocouple. 1/16" dia 12" long molybdenum sheath with Hafnia insulation and miniature connectors

XMO-W5R26-U-125-30-H-Q-14

£676.26

Availability: 2 weeks

Type C Thermocouple. 1/8" dia 14" long molybdenum sheath with Hafnia insulation and standard size connectors

XMO-W5R26-U-125-30-H-Q-8

£379.93

Availability: 2 weeks

Type C Thermocouple. 1/8" dia 8" long molybdenum sheath with Hafnia insulation and standard size connectors

XMO-W5R26-U-125-30-A-MQ-18

£514.02

Availability: 6 weeks

Type C Thermocouple. 1/8" dia 18" long molybdenum sheath with Alumina insulation and miniature size connectors

Order By Part Number

Part Number

Qty

Part Number

Qty

† All amounts shown in EUR, GBP, or USD
Note:
Note 1: Prices subject to change due to precious metal market fluctuations. Please consult the Sales Department for accurate pricing.
Note 2: Atmospheres:
      O-Oxidizing
      I-Inert
      V-Vacuum
      R-Reducing
Note 3: Maximum service temperatures shown are for probes with the largest available gauge wire leads. Consult sales for ratings of other dimension probes.
Note 4: Bending: XPA and XIN sheathed probes with platinum elements can be bent in the field.
Note 5: Some probes available in dual configurations. Check with Sales Department.