XTA / XMO / XPA / XIN - Exotic Thermocouple Probes for Measuring Temperatures up to 4200°F

Exotic Thermocouple Probes for Measuring Temperatures up to 4200°F
XTA / XMO / XPA / XIN

NEWPORT® 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 nylon connector, or transition joint with 72-inch lead wire.

Sheaths
	Tantalum
	Molybdenum
	Platinum/Rhodium
	Inconel 600
Thermocouple Elements
	Tungsten/Rhenium
	Platinum/Rhodium
Insulations
	Hafnium Oxide (HfO₂)
	Magnesia (MgO)
	Alumina (Al₂O₃)

Termination Style Q Type OGP heavy-duty, color-coded male and female connectors. Add $10 to base price.		Termination Style SX Type SHX miniature high temperature ceramic male and female connectors with color identification dot. Add $11 to base price.
Termination Style TJ Heavy-duty transition termination with 72-inch leads. Add $13 to base price.		Termination Style RP Replacement probe style with 1" bare wire leads. No additional price.
Termination Style HX Type NHX high temperature ceramic male and female connectors with color identification dot. Add $17 to base price.

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 570°F
XMO*	Molybdenum	2200°C 4000°F	Inert Vacuum Reducing	2610°C 4730°F	Sensitive to Oxidation Above 400°F Non-bendable
XPA	Platinum-Rhodium Alloy	1650°C 3000°F	Oxidizing Inert	1870°C 3400°F	No attack by SO₂ at 2000°F. Silica is Detrimental. Halogens Attack at High Temp.
XIN	Inconel 600	1150°C 2100°F	Oxidizing Inert Vacuum	1400°C 2550°F	Excellent Resisteance to Oxidation at High Temp. Hydrogen Tends to Embrittle. Very Sensitive to Sulfur 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.
Molybdenum sheathed probes are not recommended in applications where they will be exposed to carbon, including graphite.

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 (MgO)	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 Reducation 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 55 to 110°C (100 to 200°F) higher.

Calibration¹	Atmoshpere² Max. Temp³	Model No.	Base Price 6" Sheath	Price/Add'l Inch
C W-5% Re vs. W-26% Re	V. 2300°C 4200°C	XTA-W5R26-U-062-30-H--* XTA-W5R26-U-125-30-H--* XTA-W5R26-U-125-24-H--*	$206 $315 $361	$27 $40 $46
R*** Pt-13% Rh vs. Pt	V. 1475°C 2700°C	XTA-P13R-U-062-30-M--* XTA-P13R-U-125-24-M--* XTA-P13R-U-062-30-H--* XTA-P13R-U-125-24-H--*	SPECIAL SPECIAL SPECIAL SPECIAL	QUOTE QUOTE QUOTE QUOTE
C W-5% Re vs. W-26% Re	I.V.R. 2200°C 4000°C	XMO-W5R26-U-125-30-H--* XMO-W5R26-U-250-30-H--*	$244 $265	$30 $35
C W-5% Re vs. W-26% Re	I.V.R. 1540°C 2800°C	XMO-W5R26-U-250-30-A--* XMO-W5R26-U-062-40-A--* XMO-W5R26-U-125-30-A--*	$178 $129 $138	$24 $17 $20
R*** Pt-13% Rh vs. Pt	I.V.R. 1480°C 2700°C	XMO-P13R-U-125-30-A--* XMO-P13R-U-250-24-A--*	SPECIAL SPECIAL	QUOTE QUOTE
C W-5% Re vs. W-26% Re	O.I.V. 1540°C 2800°C	XPA-W5R26-U-125-30-A--*	SPECIAL	QUOTE
R*** Pt-13% Rh vs. Pt	O.I.V. 1480°C 2700°C	XPA-P13R-U-062-30-M--* XPA-P13R-U-125-25-M--* XPA-P13R-U-125-30-A--*	SPECIAL SPECIAL SPECIAL	QUOTE QUOTE QUOTE
C W-5% Re vs. W-26% Re	O.I.V. 1150°C 2100°C	XIN-W5R26-U-062-30-M--* XIN-W5R26-U-125-30-M--*	$124 $142	$14 $18
R*** Pt-13% Rh vs. Pt	O.I.V. 870°C 1600°C	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--*	SPECIAL SPECIAL SPECIAL SPECIAL SPECIAL SPECIAL	QUOTE QUOTE QUOTE QUOTE QUOTE QUOTE

*** For type S, replace “P13R” with “P10R”. For type B, replace “P13R” with “P30R”. For type G, replace “W5R26” with “WOR26”. For type D, replace “W5R26” with “W3R25”. No additional charge.

Part Number Explanation
Ordering Example: $170 + 21 = $191

XTA	W5R26	U	062	30	H	RP	7
1	2	3	4	5	6	7	8

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

1. Sheath Material: Tantalum	5. Thermocouple Wire Gage: 30 AWG
2. Calibration: W5% Re vs. W-26% Re	6. Insulation: H, HfO₂
3. Measuring Junction: Ungrounded	7. Termination: RP, Standard
4. Sheath Diameter: 0.062"	8. Length: 7" Add $21 to $170 Standard Price

Note 1: Prices subject to change. 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 gage wire leads. Consult Engineering 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.

Tantalum sheathed probes can be bent, but this must be done at the factory. If the customer chooses to bend a probe themself, all warranties are voided.