Platinum-Rhodium Fine Diameter Bare Thermocouple Wire

For high resistance to oxidation and corrosion at high temperatures, OMEGA offers the highest quality uninsulated wire for three types of “noble metal” thermocouples.
They are:

Type S:
Platinum (–) vs.
Platinum 10% Rhodium (+)

Type R:
Platinum (–) vs.
Platinum 13% Rhodium (+)

Type B:
Platinum 6% Rhodium (–) vs.
Platinum 30% Rhodium (+)

Types R and S are recommended for continuous use in oxidizing or inert atmospheres up to 2550°F (1398°C) or short term exposures to 2700°F (1482°C). Type B is rated for continuous use up to 3100°F (1704°C) in oxidizing or inert atmospheres. When operating near these maximum temperatures, the heavier gage wire sizes are recommended.

All three thermocouple types can be used in a vacuum for short periods of time. Type B offers greater stability in such applications. None should be used in reducing atmospheres or in atmospheres containing metallic or non-metallic vapors unless protected by non-metallic protection tubes. Do not insert directly into metallic protection tubes.

Sizes range from 0.001 to 0.032" (0.025 to 0.812 mm) diameter. When requested, wire is supplied in matched pairs which meet or exceed standard limits of error. Special-limits-of-error wire is supplied on request and must be ordered as matched pairs.BR>
Insulated duplex extension grade wire for types R, S, and B are also available. See, for example, model numbers EXGG-RS, EXTT-RS, EXPP-RS under the heading EXTENSION WIRE.

Uninsulated Noble Metal Thermocouple Wire

Material	Nom. Wire Dia. mm (")	Model No.	Material	Nom. Wire Dia. mm (")	Model No.
Platinum (RN, SN)	0.03 (0.001) 0.05 (0.002) 0.08 (0.003) 0.13 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.64 (0.025) 0.81 (0.032)	SPPL-001 SPPL-002 SPPL-003 SPPL-005 SPPL-008 SPPL-010 SPPL-015 SPPL-020 SPPL-025 SPPL-032	Platinum 13% Rh (RP)	0.03 (0.001) 0.05 (0.002) 0.08 (0.003) 0.13 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.64 (0.025) 0.81 (0.032)	SP13RH-001 SP13RH-002 SP13RH-003 SP13RH-005 SP13RH-008 SP13RH-010 SP13RH-015 SP13RH-020 SP13RH-025 SP13RH-032
Platinum 10% Rh (SP)	0.03 (0.001) 0.05 (0.002) 0.08 (0.003) 0.13 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.64 (0.025) 0.81 (0.032)	SP10RH-001 SP10RH-002 SP10RH-003 SP10RH-005 SP10RH-008 SP10RH-010 SP10RH-015 SP10RH-020 SP10RH-025 SP10RH-032	Platinum 6% Rh (BN)	0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.81 (0.032)	SP6RH-008 SP6RH-010 SP6RH-015 SP6RH-020 SP6RH-032
			Platinum 30% Rh (BP)	0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.81 (0.032)	SP30RH-008 SP30RH-010 SP30RH-015 SP30RH-020 SP30RH-032

Note: Metric dimensions are approximate

Insulated Duplex Extension Grade Wire*

Thermocouple Material	Used With	Model AWG	Temp. Number	Maximum
				°C	°F
Cu-Alloy 11	R&S	24 24 20	EXTT-RS-24 EXGG-RS-24 EXTT-RS-20	200 200 200	392 392 392
Cu-Cu	B	26 24 20	EXTT-B-26S EXPP-B-24S EXGG-B-20	100 100 100	212 212 212

* Also see duplex wire on pages H-25 through H-33
Note: Published price is based on market value at time of printing and is subject to change due to precious metal market fluctuations.

Uninsulated Matched Pair Noble Metal Thermocouple Wire

T/C Type	Material	Wire Dia. mm (inch)	Model No.
R	Platinum vs Platinum-13% Rhodium	0.03 (0.001) 0.05 (0.002) 0.08 (0.003) 0.13 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.64 (0.025) 0.81 (0.032)	SP13R-001 SP13R-002 SP13R-003 SP13R-005 SP13R-008 SP13R-010 SP13R-015 SP13R-020 SP13R-025 SP13R-032
S	Platinum vs Platinum-10% Rhodium	0.03 (0.001) 0.05 (0.002) 0.08 (0.003) 0.13 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.64 (0.025) 0.81 (0.032)	SP10R-001 SP10R-002 SP10R-003 SP10R-005 SP10R-008 SP10R-010 SP10R-015 SP10R-020 SP10R-025 SP10R-032
B	Platinum-6% Rhodium vs Platinum-30% Rhodium	0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.51 (0.020) 0.81 (0.032)	SP30R-008 SP30R-010 SP30R-015 SP30R-020 SP30R-032

* Ordering Unit of Measure is double inch. A double inch is 25 mm (1") of positive and 25 mm (1") of matching negative wire.
Note: Published price is based on market value at time of printing and is subject to change due to precious metal market fluctuations.
Note: Metric dimensions are approximate

View the Thermocouple Accuracy and Color Code charts