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Caracteristicas Fisicas de termocuplas (Norma Americana)

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Caracterisricas Fisicas de termocuplas

 

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Type J Thermocouple

 

Wire insulation color:
   + = White
   - = Red
Wire material:
   + = Iron
   - = Constantan
Properties:
   + = Strongly magnetic
Atmosphere for exposed junction:
   Reducing

 

 

 

 

 aasd
Type K Thermocouple

 

Wire insulation color:
   + = Yellow
   - = Red
Wire material:
   + = Chromel
   - = Alumel
Properties:
   + = Moderately magnetic
Atmosphere for exposed junction:
   Clean oxidizing

 

 

 

 

 tet
Type T Thermocouple

 

Wire insulation color:
   + = Blue
   - = Red
Wire material:
   + = Copper
   - = Constantan
Properties:
   + = Copper color
Atmosphere for exposed junction:
   Mildly oxidizing and reducing or with moisture

 

 

 

 

 rhjj
Type E Thermocouple

 

Wire insulation color:
   + = Purple
   - = Red
Wire material:
   + = Chromel
   - = Constantan
Properties:
   + = Greater stiffness
Atmosphere for exposed junction:
   Vacuum, inert mildly oxidizing or reducing

 

 

 

 

 ffsf
Type R Thermocouple

 

Wire insulation color:
   + = Black
   - = Red
Wire material:
   + = 87% Platinum, 13% Rhodium
   - = Platinum
Properties:
   + = Greater stiffness
Atmosphere for exposed junction:
   Resists oxidation and corrosion, but contaminated by hydrogen, carbon, and metal vapors

 

 

 

 

 dad
Type S Thermocouple

 

Wire insulation color:
   + = Black
   - = Red
Wire material:
   + = 90% Platinum, 10% Rhodium
   - = Platinum
Properties:
   + = Greater stiffness
Atmosphere for exposed junction:
   Resists oxidation and corrosion, but contaminated by hydrogen, carbon, and metal vapors

 

 

 


Limites de error maximos en sondas tipo termocupla.

Tolerances apply only to new thermocouples from -200°C to the recommended upper temperature limit of the probe. Tolerances change with use and it is up to the user to establish acceptable limits of error for used thermocouples. Calculated from ASTM tolerances.

Type Maximum error limit
Probes with detachable handles
J, K ±4.0°F (±2.2°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±1.8°F (±1.0°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±3.6°F (±2.0°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)
Probes with metal sheath, coiled cord, and connector
J, K ±7.9°F (±4.4°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±3.6°F (±2.0°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±6.7°F (±3.7°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)
Probes with metal sheath, straight cable, and connector
J, K ±5.9°F (±3.3°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±2.7°F (±1.5°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±5.4°F (±3.0°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)
Probes with metal sheath, straight cable, and stripped ends
J, K ±4.0°F (±2.2°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±1.8°F (±1.0°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±3.6°F (±2.0°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)
Probes made of one piece of thermocouple wire with a connector
J, K ±4.0°F (±2.2°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±1.8°F (±1.0°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±3.6°F (±2.0°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)
Thermocouple wire only, no connector
J, K ±2.0°F (±1.1°C), or ±0.4% of reading above 32°F (0°C); ±2.0% of reading below 32°F (0°C)
T ±0.9°F (±0.5°C), or ±0.4% of reading above 32°F (0°C); ±0.8% of reading below 32°F (0°C)
E ±1.8°F (±1.0°C), or ±0.4% of reading above 32°F (0°C); ±0.5% of reading below 32°F (0°C)