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.
Max. Operating Temp.
Approx. Melting Point
Resists Many Acids and Weak Alkalies. Very Sensitive to
Oxidation Above 300°C
Inert Vacuum Reducing
Sensitive to Oxidation
Above 200°C Non-bendable
Platinum- Rhodium Alloy
No Attack by SO2
at 1100°C. Silica Is Detrimental. Halogens Attack at High Temp.
Oxidizing Inert Vacuum
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.
Max. Operating Temp.**
Approx. Melting Point
Nontoxic substitute for BeO. High Thermal Conductivity.
Hygroscopic. Compacts Well.
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.
Maximum service temperatures
shown are for probes with the
largest available gauge wire leads.
Consult Engineering for ratings of
other dimension probes.
Bending: XPA and XIN sheathed
probes with platinum elements
be bent in the field.
Some probes available in dual
configurations. Check with Sales
Order By Part Number
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.