Page 1
Tungsten-Rhenium Twisted Beaded
A
Thermocouples
Tungsten-rhenium thermocouples were developed
to meet the requirements for measuring ultra-high
temperatures in the 2760°C (5000°F) range.
OMEGA sells 3 widely used tungsten-rhenium
thermocouple calibrations: tungsten versus
tungsten-26% rhenium, tungsten-5% rhenium
versus tungsten-26% rhenium, and tungsten-3%
rhenium versus tungsten-25% rhenium.
OMEGA® tungsten-rhenium thermocouples conform
to the limits of error listed in the table below.
Because of the inherent brittleness of unalloyed tungsten,
the tungsten versus tungsten-26% rhenium thermocouples
are more difficult to handle than the tungsten-5% rhenium
versus tungsten-26% rhenium combination.
The average emf of the W-3% Re/W-25% Re is slightly
less than that of W/W-26% Re and slightly more than
that of W-5% Re/W-26% Re. The ductility of W-3% Re
is about equal to that of W-5% Re, but superior to that
of unalloyed tungsten.
All 3 thermocouple calibrations can be used to 2760°C
(5000°F) in hydrogen or inert gas atmospheres and in
a vacuum. They deteriorate rapidly under oxidizing
conditions and should not be used in air or atmospheres
containing oxygen.
OMEGA tungsten-rhenium thermocouples come
in 300 mm (12") lengths, which corresponds to
each for a 600 mm (24") total length. Longer
lead lengths are available; consult sales.
Extreme
Temperature
Contact Sales
for Untwisted
Custom
High
For OB-Series of Visit
OMEGABOND
at omega.com.
For ceramic insulators visit us online.
®
Cements
®
Limits of Error for Tungsten-Rhenium Thermocouple Wire Combinations
Wire Diameter mm (inch) Temperature Range (†) Maximum Error or Departure
0.075 0 to 425°C (32 to 800°F) ±4.5°C (±8°F)
(0.003) 426 to 1750°C (800 to 3200°F) ±1%
0.125 0 to 425°C (32 to 800°F) ±4.5°C (±8°F)
(0.005) 426 to 1975°C (800 to 3600°F) ±1%
0.25 to 0.50 0 to 425°C (32 to 800°F) ±4.5°C (±8°F)
(0.010 to 0.020) 426 to 2325°C (800 to 4200°F) ±1%
†
Up to 2760°C (5000°F) for short-term exposure.
To Order
Wire Diameter Unsheathed
Materials mm (inch) Model No.**
Tungsten 26% Re
0.381 (0.015) TOR-015 -12
0.500 (0.020) TOR-020-12
Tungsten 5% Re-
Tungsten 26% Re
0.381 (0.015) T5R-015 -12
0.500 (0.020) T5R-020-12
Tungsten 3% Re-
Tungsten 25% Re
0.500 (0.020) T3R-020-12
* Most popular of the 3 tungsten-rhenium thermocouples; a large selection of instrumentation is available.
** Tungsten-rhenium alloy thermocouples are supplied in standard 300 mm (12") lengths [600 mm (24") loops]. Change suffix “-12” in model number
to indicate additional length (in inches) required. Consult Sales for other sizes.
Ordering Example: T5R-005-12, 300 mm (12"), Type C thermocouple, 0.125 mm (0.005") diameter.
0.075 (0.003) TOR-003 -12
0.125 (0.005) TOR-005 -12
G
Tungsten-
0.075 (0.003) T5R-003-12
C
*
0.127 (0.005) T3R-005-12
D
0.250 (0.010) TOR-010-12
0.125 (0.005) T5R-005 -12
0.250 (0.010) T5R-010-12
0.250 (0.010) T3R-010-12
0.381 (0.015) T3R - 015-12
A-20
Loading...