Thermocouples are classified by calibration type because they have differing EMF (electromotive force) versus temperature curves. Some generate considerably more voltage at lower temperatures, while others do not begin to develop a significant voltage until subjected to high temperatures.
Also, calibration types are designed to deliver as close to a straight line voltage curve inside their temperature application range as possible. This makes it easier for an instrument or temperature controller to correctly correlate the received voltage to a particular temperature. Additionally, thermocouple calibration types have different levels of compatibility with different atmospheres. Chemical reaction between certain thermocouple alloys and the application atmosphere could cause metallurgy degradation, making another calibration type more suitable for sensor life and accuracy requirements.
Thermocouples are best suited to high temperatures, environmental extremes or applications requiring microscopic size sensors. They are also recommended for high vibration environments.
|
| |
| Transistion Style Thermocouple |
(Transistion Style) |
| |
 Made with standard limits-of-error +/- 2C. Special limits-of-error +/- 1C material is available for
better accuracy
Standard insulation provided with 316 SS sheaths, high purity insulation provided with Inconel 600
sheath
Maximum continuous operating temperature for the standard transition is 177°C. A high temperature
transition 482°C maximum can be provided
Standard lead wire 36" length with 3/4” stripped leads
.063” to .125” O.D. thermocouples use 24 gauge lead wire and .188” to .375” O.D. thermocouples use
20 gauge lead wire
|
Roller Wheel Moving Surface Thermocouple
Type K ( Chromel / Alumel ), Temp range -250 to 260°C , Probe length 2.4", Cable length 3 ft,
Connections mini-connector, Junction exposed These probes are designed for monitoring a wide range of flat surfaces. Choose from a variety of
surface probes—standard, angled for hard-to-reach areas, heavy-duty, or special-purpose surface probes
for specific applications. These probes include a handle; strain relief spring on handle protects the cable
connection against damage due to repeated flexing and tugging. Probes include handle with strain relief
spring and feature color-coded ANSI mini-connectors: type K—yellow
|
(Roller Wheel Moving Surface) |
Low-Cost Hollow-Tube Thermocouple
Maximum temperature from 204°C to 704°C based on wire type
J, K, T, E, N calibrations available
Epoxy or ceramic potting material
Stainless steel sheath
|
(Low cost hollow tube) |
Melt Bolt Thermocouples
Stainless steel melt bolt
Stainless steel probe
Fiberglass or MGO insulated probe
Type J and K thermocouples for use up to 482°C
Type T thermocouple for use up to 371°C
|
(Melt Bolt Thermocouples) |
Spring Adjustable Bayonet Thermocouples
Types J and K thermocouples for use up to 482°C based on insulation type
Type T thermocouple for use up to 371°C based on insulation type
Stainless steel sheath material
3/16” probe diameter is industry standard (1/8” and 1/4” optional)
12” spring |
(Spring Adjustable Bayonet) |
Home 
