Thermocouple selection
Type J Thermocouples for Industrial Applications
Type J is selectable on the MI-37 and Special Coated PTFE assemblies and is listed for the WP-73 pipe-surface contact thermocouple. Compare each product's published choices with your measurement requirements.
Available assemblies
Type J and Selectable J/K Assemblies
MI-37 and the PTFE assembly offer selectable J or K; WP-73 lists J among its supported sensor types for pipe-surface contact measurement. Check each product page before ordering.
Selectable J or K
Mineral Insulated Thermocouple
MI-37 lists J or K type, grounded or ungrounded junctions, SS316 or Inconel 600 sheath choices, and 4.7 mm or 6.35 mm diameters—useful details to compare with the other assembly's options.
View MI-37 specifications →Selectable J or K
Thermocouple With Special Coated PTFE
The PTFE-coated model lists selectable J or K, simplex or duplex assembly, ceramic or mineral insulation, an ungrounded junction, and sheath OD choices including 4.7, 6.35 and 12.7 mm.
View PTFE model specifications →
Type J listed · Pipe surface
Pipe-Surface Temperature Thermocouple
WP-73 lists Type J among its supported sensor types and describes a curved-plate contact thermocouple for pipeline and surface measurement. Check its dimensions, sheath and cable against your installation.
View WP-73 specifications →Selection FAQs
Type J Thermocouple Questions
Which products list Type J?
MI-37 and the Special Coated PTFE thermocouple list J as selectable; WP-73 lists J among its supported types for pipe-surface contact measurement. Their other options are not interchangeable.
What details matter?
Check junction, sheath, diameter, insertion length, cable and termination against the selected product and process.
Is there one universal range?
Confirm the selected assembly's range and conditions; any compliance requirements need separate confirmation.
Selection checklist
Specify the Complete Measurement Point
Type J identifies the thermocouple calibration, but the assembly must also match the installation. Share the actual process and mounting details for configuration review.
- Process conditionsState the normal and maximum temperature and the process environment.
- Sheath and dimensionsConfirm required material, diameter and insertion length.
- Junction and assemblyChoose grounded or ungrounded and simplex or duplex only where the product lists those options.
- Termination and mountingDescribe the head, connector, cable and process connection required.
Application context
Choose with Application Context
Use these resources to define the installation before comparing constructions. Check the selected product against the actual operating conditions.
Replacing a J-type thermocouple
Match the probe and termination
Keep the Type J requirement alongside the mechanical dimensions. Compare sheath diameter, insertion length, fixing method, junction and cable construction with the old assembly. For a connector-equipped probe, the J-type MI quick-disconnect thermocouple provides a separate construction to review.
Check the instrument before changing type
Do not substitute Type K solely because a probe fits the same mounting. Check the configured thermocouple input, wiring and connection with the receiving instrument. Use the J vs K comparison to prepare the selection questions.
Send a drawing or photographs of the tip and termination, the operating temperatures and required quantity. State whether you need a like-for-like replacement or a changed construction, and include any inspection or calibration requirements. When comparing J-type supplier quotations, keep the junction, dimensions and termination the same; ask for any proposed difference to be identified. See the India manufacturer overview for purchasing and quality information.
Discuss Your Type J Requirement
Send your process temperature, sheath, dimensions, junction, mounting and termination details.