Thermocouples & RTD’s

THERMOCOUPLES & RTD’s

Acrolab’s thermocouples, RTDs, thermistors and accessories are suitable for plastic injection, medical, pharmaceutical, chemical, food, dairy, agricultural and general industrial applications. Our thermocouples are meticulous to the highest quality standard.  Our RTD assemblies utilize wire wound platinum elements and are filled tube or MgO construction, providing long operating life in high vibration and/or temperature applications.

THERMOCOUPLE MATERIAL SPECIFICATIONS

ANSI CALIBRATION CODEPOSITIVE LEGNEGATIVE LEGTEMP. RANGE°F(°C) OF PROT. TC **APPLICATION INFORMATION
JIronConstantan *32 to 1400
(0 to 760)
Suitable for vacuum, reducing or inert atmospheres, oxidizing atmospheres with reduced life. Iron oxidizes rapidly above 1000°F (538°C) so only heavy gauge wire is recommended for high temperature. Bare elements should not be sulphurous atmospheres above 1000°F (538°C)
KChromel *ALumel *32 to 2300
(0 to 1260)
Recommended for continuous oxidizing or neutral atmpspheres. Mostly used above 1000°C (538°C). Subject to failure if exposed to sulphur. Preferential oxidation of chromium in positive leg at certain low oxygen concentrations causes "green rot" and large negative calibration drifts most serious in the1500-1900°F (816-1038°C) range. Ventilation or inert-sealing of the protection tubes can prevent this.
TCopperConstantan *-300 to 700
(-184 to 371)
Useable in oxidizing. Reducing or inert atmospheres as well as vacuum. Not subject to corrosion in moist atmospheres. Limits are published for sub-zero temperature ranges.
EChromel *Constantan *32 to 1600
(0 to 871)
Recommended for continuously oxidizing or inert atmospheres. Sub-zero limits of error are not established. Highest thermoelectric output of common calibrations.
R

S
Platinum 13% Rhodium
Platinum 10% Rhodium
Platinum
Platinum
100 to 3100
(538 to 1482)
Protection tube and ceramic insulators. Continued high temperature usagesRecommended for high temperature. Must be protected with a non-metalliccause grain which can lead to mechanical failure. Negative calibration drift caused by rhodium diffusion to pure leg as well as from rhodium volatilization. Type R is generally used in industry while Type S is general used in laboratories.
BPlatinum 30% RhodiumPlatinum 6% Rhodium1600 to 3100
(871 to 1705)
Similar to type R & S but output is lower. Also less susceptible to grain growth and drift.
MNickel18% Nickel Molybedenum32 to 2250
(0 to 1287)
High temperature applications in inert or vacuum atmospheres. Useful in many hydrogen applications. Continuous cycling causes excessive grain growth.
C5% Tungsten Rhenium (W-5Re)26% Tungsten Rhenium (W-26Re)32 to 4200
(0 to 2315)
Very high temperature applications in inert or vacuum atmospheres. Preferred over Tungsten/26%, Tungsten Rhenium because it is less brittle at low temperatures.
W3% Tungsten Rhenium (W-3Re)25% tungsten Rhenium (W-25Re)32 to 4200
(0 to 2315)
The ductility of W3R3 leg is superior to pure Tungsten, but not as good as W5Re. This combination has the highest output if the 3 common Tungsten Rhenium calibrations from 1860 to 4200°F.
NNicrosil *** 14.5% Chromium 1.4% Silicon 0.1% Magnesium Balance Nickel4.2% Nisil *** 0.1% Silicon Magnesium Balance Nickel32 to 2300
(0 to 1260)
Can be used in applications where Type K elements have shorter life and stability problems due to oxidation and the developement of "green rot".
NONEPlatinel * 5355Platinel * 767432 to 2300
(0 to 1260)
Noble metal combination which approximates Type K curve bus has much improved oxidation resistance. Should be treated as any noble metal calibration.