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Haridas Temperature Measuring Instruments

Selection Guide for Bi-Metallic Dial Thermometers

THERMOCOUPLES

Thermocouples are extremely robust and offer the highest level of tolerance to shock and vibration. The various types cover a temperature range from -270°C to +1700°C. They can be produced in extremely small diameters where speed of response is a critical factor.

Sheath Materials

A wide range of standard sheath materials are available, including Stainless Steel Types 310, 316 and 321, Inconel 600, Re-crystallised Alumina, Ceramic etc.

THERMOCOUPLE TYPES
International Symbol Names of Materials Useful Application Range
B Platinum30% Rhodium (+)
Platinum 6% Rhodium (-)
2500 -3100°F
1370-1700°C
E Chromel (+)
Constantan (-)
200-1650°F
95-900°C
J Iron (+)
Constantan (-)
200-1400°F
95-760°C
K Chromel (+)
Alumel (-)
200-2300°F
95-1260°C
R Platinum 13% Rhodium (+)
Platinum (-)
2640°F
870-1450°C
S Platinum 10% Rhodium (+)
Platinum (-)
1800-2640°F
980-1450°C
T Copper (+)
Constantan (-)
-330-660°F
-200-350°C

RESISTANCE TEMPERATURE DETECTORS (RTDs)

Platinum Resistance Sensors offer the highest standard of accuracy and stability of any temperature sensor. They exhibit good linear response, covering a range from -200° C to +650° C. They require no special cables or cold junction reference.

Conductors

Standard RTD's are 100 ohms at 0° C, in two, three or four wire configuration. Single and Duplex type RTD's are available as standard.

Sheath Materials

A wide range of standard sheath materials are available, including Stainless Steel Types 316 and 321 and Inconel 600.