Images are representations only.
Style 21 Terminal Head Style Thermocouple
Brand: United Electric Controls LtdTerminal Head Styles
Type J: The Iron - Constantan "J" curve thermocouple is the most widely used thermocouple; it is versatile and has a relatively low cost. It has a positive Iron wire and a negative Constantan wire and is recommended for reducing atmospheres. The operating range for this alloy combination is from 0° to 750° C (32° to 1380° F) for the largest wire sizes. Smaller size wire should operate in correspondingly lower temperatures.
Type T: The Copper - Constantan "T" curve thermocouple, with a positive Copper wire and a negative Constantan wire, is recommended for use in mildly oxidizing and reducing atmospheres at temperatures from 0° to 350° C (32° to 660 °F). They are suitable for applications where moisture is present.
This alloy is recommended for low temperature work since the homogeneity of the component wires can be maintained better than with other base metal wires. Therefore, errors due to inhomogeneity of wires in zones of temperature gradients are greatly reduced.
Type K: The Chromel™ - Alumel™ "K" curve thermocouple is often used at high temperatures. It has a positive Chromel™ wire and a negative Alumel™ wire and is recommended for use in clean oxidizing atmospheres. The operating range for this alloy is from 0° to 1250° C (32° to 2280° F) for the largest wire sizes. Smaller size wire should operate in correspondingly lower temperatures.
Type E: The Chromel™ - Constantan "E" curve thermocouple has the highest emf of all standard thermocouples. It has a positive Chromel ™ wire and a negative Constantan wire and is recommended for use in oxidizing, inert or dry reducing atmospheres or for short periods of time in a vacuum. These elements must be protected from sulfurous and marginally oxidizing atmospheres. Type E thermocouples can be used for temperatures from 0° to 900° C (32° to 1650° F).
Thermocouple Insulation Types
MI - For higher temperature applications, a Mineral Insulation can be added in the tube. For UE MI thermocouples compressed magnesium oxide is added inside the tube. These are used to measure temperatures of 260° C (500° F) and higher.
Specifications
Approvals & Certifications
- ATEX EEx d LlC
- CSA Class I, Div. 1, Groups B, C, D, Class II Groups E, F, G
- FM Class I, Div. 1, Groups B, C, D, Class II Groups E, F, G
- UL Class I, Div. 1, Groups C, D, Class II Groups E, F, G
Approvals & Certifications
- Certificate of Conformance
Communication
- HART
Conduit Connection
- 1/2” NPT
- 3/4” NPT
Connection Material
- Welded Stainless Steel
Diameter
- Sheath: 0.125” to 0.375” (3.17 to 9.52 mm)
Electrical Connectors
- Cable Gland
- Terminal Block
Enclosure, Body Material
- Terminal Head: Cast Iron
- Terminal Head: Cast or Epoxy Coated Aluminum
- Terminal Head: Nylon
- Terminal Head: Polypropylene (White or Black)
Environmental Protection
- Explosion-proof
- IP66
- IP68
- NEMA 4
- NEMA 4X
Gasket Material
- O-Ring Gasket: Silicone Rubber
Input
- 4-20 mA, 2-Wire Transmitter
Junction
- Hot Junction: Exposed
- Hot Junction: Grounded
- Hot Junction: Ungrounded
Materials of Construction
- Chain, Compression Fitting, Ferrule: Stainless Steel
- Compression Fitting & Ferrule: Brass
- Ferrule: Teflon
- Sheath: 316 Stainless Steel
- Sheath: Inconel 600
NACE & NIST
- NIST Traceable Calibration
Name Plate, Tag Material
- Stainless Steel
NPT Connection
- 1/2” NPT Male
- Compression Fitting: 1/4” NPT Male
- Compression Fitting: 1/8” NPT Male
Output
- 4-20 mA, 2-Wire Transmitter, Isolated or Non-Isolated Output
Pipe Size
- Nominal Pipe Size for Weld Pad: 1” to 4” (25 to 101.6 mm)
Sensor, Probe Type
- E Thermocouple (Single & Dual)
- J Thermocouple (Single & Dual)
- K Thermocouple (Single & Dual)
- Mineral Insulated Thermocouple
- T Thermocouple (Single & Dual)
Temperature Range
- O-Ring Gasket: 100° C (212° F)
