Exotic Thermocouple Probes
Refractory metals are
Standard
Connector
Miniature
Connector
Standard Connector
[Cold end temperature is rated
to 100°C (212°F) max]
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 Helium
or Argon.
Shown smaller than actual size.
Temperatures up to
2315°C
2315°C
(4200°F)
(4200°F)
For Measuring
Note:
For Type G, C and D,
ANSI color codes are
used as there is no
IEC standard.
Sheath Materials
Max Approx
Operating Working Melting
Code Material Temp Environment Point Remarks
Resists Many Acids and
XTA Tantalum*
4200°F 5430°F Sensitive to Oxidation
Above 300°C (570°F)
XMO Molybdenum*
Reducing Non-Bendable
XPA Rhodium
Attack at High Temp
Excellent Resistance to
XIN
Vacuum Embrittle. Very Sensitive
to Sulfur Corrosion
Insulation Materials
Max Approx
Operating Melting
Code Material Temp** Point Remarks
(HfO
(MgO) 3000°F 5050°F Compacts Well
2800°F 3650°F Compact Satisfactorily
Note: For temperatures above 1000°C (1800°F), all insulating materials experience a
substantial decrease in resistivity with increasing temperatures.
Molybdenum and Tantalum sheathed probes are not recommended in applications where
*
they will be exposed to carbon, including graphite.
Values given are for compacted insulation. For uncompacted hard-fired insulators, useful
**
temperature range can be 5 to 110°C (100 to 200°F) higher.
Platinum-
Inconel 1150°C
Hafnia 2500°C 2830°C Nontoxic substitute for BeO
H
Magnesia 1650°C 2790°C Hygroscopic
M
A
2315°C
2200°C
4000°F
No Attack by SO
1650°C Oxidizing 1870°C 1093°C (2000°F). Silica
3000°F Inert 3400°F Is Detrimental. Halogens
Alloy
600 2100°F
2) 4530°F 5125°F High Thermal Conductivity
Alumina
(Al
2O3
)
1540°C 2010°C Volume Reduction to
Vacuum
Inert
Vacuum
Oxidizing
Inert
Requires Considerable
3000°C Weak Alkalies. Very
Sensitive to Oxidation
2610°C
Above 204°C (400°F)
4730°F
Oxidation at High Temp.
1400°C
Hydrogen Tends to
2550°F
at
2
Sheaths
†
U Tantalum
U Molybdenum
U Platinum/Rhodium
U Inconel 600
Thermocouple Elements
U Tungsten/Rhenium
U Platinum/Rhodium
Insulations
U Hafnium Oxide (HfO2)
U Magnesia (MgO)
U Alumina (Al
OMEGA®
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
maximum 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 m (72") lead wire.
† Non-metallic sheaths are also available.
Please see PTRA and PTRM ceramic
Exotic Thermocouple
thermocouple protection tubes
at omega.com
2O3
)
A-63
Standard Connector - Style Q
Standard Connector - Style HX
Termination Style Q
Type HSTW solid pin construction
standard connector for maximum
durability and service. Color coded
male and female connectors.
Add additional cost to the base price.
Termination Style HX
Type NHX high temperature ceramic
male and female connectors with color
identification dot. Add additional cost to
base price.
Termination Style MQ
Type HMPW miniature connector, colorcoded. Male and female connectors.
Add additional cost to the base price.
A
Miniature Connector - Style MQ
Crimp bushing
Miniature Connector - Style SX
Transition Joint - Style TJ
Transition Joint - Style TJ-BX
Termination Style TJ-BX
Heavy-duty transition termination with 2 m (72")
stainless steel BX armored cable. The armoring
adds durability and abrasion protection. Add
additional cost to the base price.
Transition Joint - Style TJ-SB
Termination Style TJ-SB
Heavy-duty transition termination with 2 m (72")
stainless steel braid cable.The over braiding adds
durability and abrasion protection. Add additional cost
to the base price.
RP Style Termination
Stainless
Termination Style RP
Replacement probe style with 25 mm (1")
bare wire leads. No additional price.
To Order
Pricing and Details
Protection Male Th’s Length 316 Stainless
Tube OD in NPT mm (inch) Steel Model No.
1
⁄
16
1
⁄
16
1
⁄
8
1
⁄
8
3
⁄
16
3
⁄
16
1
⁄
4
1
⁄
4
Visit omega.com/xta-w5r26 for
1
24.6 (0.97) SSLK-116-116
⁄
16
1
26.2 (1.03) SSLK-116-18
⁄
8
1
30.0 (1.18) SSLK-18-18
⁄
8
1
44.2 (1.74) SSLK-18-14
⁄
4
1
31.0 (1.22) SSLK-316-18
⁄
8
1
46.0 (1.81) SSLK-316-14
⁄
4
1
32.8 (1.29) SSLK-14-18
⁄
8
1
37.6 (1.48) SSLK-14-14
⁄
4
steel chain
and screws.
Termination Style NB1-LK/NB12-LK
Industrial protection heads with optional stainless steel compression
fitting for application requiring fast mounting and level adjustment of probe.
Add additional cost to the base price for NB1/NB12 style heads, specify “NB1-LK”.
Add additional cost to the base price for NEMA 4X rated head, specify “NB15-LK”.
Add additional cost to the base price for explosion resistant rated head, specify
“NEPB-LK” or “NEPA-LK”.
Select appropriate size optional compression fitting. Available in different
mounting threads. Small diameter probes should be handled with greater
care than our larger probes.
Termination Style SX
Type SHX miniature high temperature
ceramic male and female connectors with
color identification dot. Add additional cost
to base price.
Termination Style TJ
Heavy-duty transition termination with
2 m (72") braided fiberglass insulated lead
wire. Available as an option with PFA lead
wire—add suffix “-T”. Add
the base price
Cast iron protection head with
internal terminal block shown
1
⁄2 NPT
mounting
threads
.
Silver solder
additional cost
Probe length
to
Termination Style NB1/NB12
Industrial protection heads suitable for demanding environments; such
as heavy industrial and processes applications. Different head styles are
available to meet application requirements. Visit omega.com for complete
specifications or consult our technical quotation department.
Add additional cost to the base price for NB1/NB12 style heads.
Add additional cost to the base price for NEMA 4X rated head,
specify “NB15”.
Add additional cost to the base price for explosion resistant rated head,
specify “NEPB” or “NEPA”.
Rated NEMA 4X
316 SS head
A-64
Stainless
steel hex
fitting
1
⁄2 NPT
wire entry
Silver
solder
Optional stainless
steel compression
fitting allowing field
positioning setting of
the immersion length
Probe length
To Order Visit omega.com/xta-w5r26 for Pricing and Details
Atmosphere
Calibration Max Temp
XMO-W5R26-U-250-30-H-*-**
XMO-W5R26-U-062-36-H-*-**
C I.V.R.
W-5% Re 2200°C
vs. W-26% Re 4000°F
XMO-W5R26-U-250-24-H-*-**
XMO-W5R26-U-062-40-A-*-**
XMO-W5R26-U-062-36-A-*-**
C I.V.R. XMO-W5R26-U-125-30-A-*-**
W-5% Re 1540°C XMO-W5R26-U-187-30-A-*-**
vs. W-26% Re 2800°F XMO-W5R26-U-187-24-A-*-**
XMO-W5R26-U-250-30-A-*-**
XMO-W5R26-U-250-24-A-*-**
XMO-P13R-U-062-40-A-*-*
XMO-P13R-U-062-36-A-*-*
†
I.V.R. XMO-P13R-U-125-30-A-*-*
R
Pt-13% Rh 1480°C XMO-P13R-U-187-30-A-*-*
vs. Pt 2700°F XMO-P13R-U-187-24-A-*-*
XMO-P13R-U-250-30-A-*-**
XMO-P13R-U-250-24-A-*-**
XTA-W5R26-U-062-30-H-*-**
XTA-W5R26-U-125-30-H-*-**
C V. XTA-W5R26-U-125-24-H-*-**
W-5% Re 2300°C XTA-W5R26-U-187-30-H-*-**
vs. W-26% Re 4200°F XTA-W5R26-U-187-24-H-*-**
XTA-W5R26-U-250-30-H-*-**
XTA-W5R26-U-250-24-H-*-**
XTA-P13R-U-062-30-M-*-**
XTA-P13R-U-125-30-M-*-**
XTA-P13R-U-125-24-M-*-**
XTA-P13R-U-187-30-M-*-**
XTA-P13R-U-187-24-M-*-**
†
V. XTA-P13R-U-250-30-M-*-**
R
Pt-13% Rh 1475°C XTA-P13R-U-250-24-M-*-**
vs. Pt 2700°F XTA-P13R-U-062-30-H-*-**
XTA-P13R-U-125-30-H-*-**
XTA-P13R-U-125-24-H-*-**
XTA-P13R-U-187-30-H-*-**
XTA-P13R-U-187-24-H-*-**
XTA-P13R-U-250-30-H-*-**
XTA-P13R-U-250-24-H-*-**
†
R
O.I.V. XPA-P13R-U-062-30-M-*-**
Pt-13% Rh 1480°C XPA-P13R-U-125-24-M-*-**
vs. Pt 2700°F XPA-P13R-U-125-30-A-*-**
C O.I.V. XPA-W5R26-U-062-40-A-*-**
W-5% Re 1540°C XPA-W5R26-U-062-36-A-*-**
vs. W-26% Re 2800°F XPA-W5R26-U-125-30-A-*-**
XIN-W5R26-U-125-30-M-*-**
W-5% Re 1150°C XIN-W5R26-U-187-30-M-*-**
vs. W-26% Re 2100°F XIN-W5R26-U-187-24-M-*-**
XIN-W5R26-U-250-30-M-*-**
XIN-W5R26-U-250-24-M-*-**
O.I.V. XIN-P13R-U-062-30-M-*-**
Pt-13% Rh 1600°F XIN-P13R-U-125-24-M-*-**
vs. Pt 870°C XIN-P13R-U-187-26-M-*-**
1600°F XIN-P13R-U-250-24-M-*-**
XIN-P13R-U-250-20-M-*-**
XIN-W5R26-U-062-30-M-*-**
C O.I.V. XIN-W5R26-U-125-24-M-*-**
†
870°C XIN-P13R-U-125-30-M-*-**
R
2
3
Model Number
XMO-W5R26-U-125-30-H-*-**
XMO-W5R26-U-187-30-H-*-**
XMO-W5R26-U-187-24-H-*-**
Custom Assemblies Available,
Contact Custom Engineering.
Model Number Explanation
Ordering Example:
- - - - -
XMO
†
B, replace “P13R” with “P30R”. For type G, replace
“W5R26” with “WOR26”. For type D, replace
“W5R26” with “W3R25”. No additional charge.
Type D “W3R25” not available in 40 AWG (0.003").
Type B “P30R” not available in 40 AWG (0.0031")
and 36 AWG (0.005"). TJ Style probes are only
available for type C, R, S or B calibrations.
Wire batch certificate reports available at no charge
upon request; 40 AWG and up for type
C, G, and D, 36 AWG and up for type R, S and B.
Add Suffix “-CERT” to model number.
*
TJ-BX, TJ-SB, RP, NB or NB(*)-SSLK.
**
W5R26
1
1. Sheath Material: Molybdenum
2. Calibration: W5% Re vs. W-26% Re
3. Measuring Junction: Ungrounded
4. Sheath Diameter: 0.125"
5. Thermocouple Wire Gage: 30 AWG
6. Insulation: Alumina, Al2O
7.
Termination: HSTW
Length: 12"
8.
* Specify Termination Style: Q, HX, MQ, SX,
TJ, TJ-BX, TJ-SB, RP, NB or NB-LK
** Specify Probe Length in inches
(1" = 25.4 mm)
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 himself,
all warranties are voided.
For type S, replace “P13R” with “P10R”. For type
Specify termination style: Q, HX, MQ, SX, TJ,
Specify probe length in inches (1" = 25.4 mm).
U 3125430 5A
2
- -
12
Q
6
3
8
7
A-65
T-dual TC/TypeJ
Exotic Dual Element
Thermocouple
Assemblies
A
U Two Sensor
XMO-W5R26-U-125-H-MQ-12-DUAL.
Readings—
Built-In Backup
U Allows Two Readings
of a Single Point
U Continuous Monitor
and Control
1
U 3.0 to 6.0 mm (
⁄8 to 1⁄4")
Diameter
Sheaths
†
U Tantalum (XTA)
U Molybdenum (XMO)
U Inconel 600 (XIN)
Thermocouple Elements
U Tungsten/Rhenium
U Platinum/Rhodium
Insulations
U Hafnium Oxide (HfO
U Alumina (Al
Mating connector with cable
clamps included.
2O3
)
Performs two
functions with ONE
dual element probe!
Controller
Recorder
Visit omega.com for complete specifications, termination options, footnotes, and ordering example.
Dual element thermocouple assemblies are rigid construction—not bendable.
Termination style Q, add additional cost to base price. Termination style NX (NOX), add additional cost to base price. Termination style MQ,
add additional cost to base price. Termination style SX, add additional cost to base price. Termination style TJ, add additional cost to base
price. Termination style TJ-BX, add additional cost to base price. Termination style TJ-SB, add additional cost to base price. Termination style
RP, no additional cost. Termination style NB1/NB12, add additional cost to base price for NB1/NB12 style heads.
Add additional cost to base price for NEMA 4X rated head, specify NB15. Add additional cost to base price for explosion resistant rated head,
specify NEPB or NEPA Termination style NB1-LK/NB12-LK. Add additional cost to base price for NB1/NB12 style heads. Add additional cost to
base price for NEMA 4X rated head, specify NB15-LK. Add additional cost to base price for explosion resistant rated read, specify NEPB-LK
or NEPA-LK.
To Order Visit omega.com/xta-w5r26 for Pricing and Details
Atmosphere
Calibration Max Temp
W-5% Re 2200°C XMO-W5R26-U-187-24-H-*-**-DUAL
vs. W-26% Re 4000°F XMO-W5R26-U-250-30-H-*-**-DUAL
XMO-W5R26-U-250-24-H-*-**-DUAL
XMO-W5R26-U-125-30-H-*-**-DUAL
C I.V.R. XMO-W5R26-U-187-30-H-*-**-DUAL
XMO-W5R26-U-125-30-A-*-**-DUAL
W-5% Re 1540°C XMO-W5R26-U-187-24-A-*-**-DUAL
vs. W-26% Re 2800°F XMO-W5R26-U-250-30-A-*-**-DUAL
XMO-W5R26-U-250-24-A-*-**-DUAL
Pt-13% Rh 1480°C XMO-P13R-U-187-24-A-*-**-DUAL
)
vs. Pt 2700°F XMO-P13R-U-250-30-A-*-**-DUAL
2
XMO-P13R-U-250-24-A-*-**-DUAL
W-5% Re 2300°C XTA-W5R26-U-187-24-H-*-**-DUAL
vs. W-26% Re 4200°F XTA-W5R26-U-250-30-H-*-**-DUAL
XTA-W5R26-U-250-24-H-*-**-DUAL
XTA-W5R26-U-125-30-A-*-**-DUAL
W-5% Re 1480°C XTA-W5R26-U-187-24-A-*-**-DUAL
vs. W-26% Re 2700°F XTA-W5R26-U-250-30-A-*-**-DUAL
XTA-W5R26-U-250-24-A-*-**-DUAL
Pt-13% Rh 1475°C XTA-P13R-U-187-24-A-*-**-DUAL
vs. Pt 2700°F XTA-P13R-U-250-30-A-*-**-DUAL
XTA-P13R-U-250-24-A-*-**-DUAL
C I.V.R. XMO-W5R26-U-187-30-A-*-**-DUAL
XMO-P13R-U-125-30-A-*-**-DUAL
†
I.V.R. XMO-P13R-U-187-30-A-*-**-DUAL
R
XTA-W5R26-U-125-30-H-*-**-DUAL
C V. XTA-W5R26-U-187-30-H-*-**-DUAL
C V. XTA-W5R26-U-187-30-A-*-**-DUAL
XTA-P13R-U-125-30-A-*-**-DUAL
†
V. XTA-P13R-U-187-30-A-*-**-DUAL
R
XIN-W5R26-U-125-30-A-*-**-DUAL
W-5% Re 1150°C XIN-W5R26-U-187-24-A-*-**-DUAL
vs.W-26% Re 2100°F XIN-W5R26-U-250-30-A-*-**-DUAL
XIN-W5R26-U-250-24-A-*-**-DUAL
Pt-13% Rh 870°C XIN-P13R-U-187-24-A-*-**-DUAL
vs. Pt 1600°F XIN-P13R-U-250-30-A-*-**-DUAL
XIN-P13R-U-250-24-A-*-**-DUAL
C O.I.V. XIN-W5R26-U-187-30-A-*-**-DUAL
XIN-P13R-U-125-30-A-*-**-DUAL
†
O.I.V. XIN-P13R-U-187-30-A-*-**-DUAL
R
2
3
Model Number
Both shown close to actual size.
A-66
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