Section B.3 Using An Exposed Junction Thermocouple - Spectrum Controls 1769 Series User Manual

Section B.3
Using an Exposed
Junction
Thermocouple
Appendix B: Using Thermocouple Junctions
An exposed junction thermocouple uses a measuring junction that does not have
a protective metal sheath. A thermocouple with this junction type provides the
fastest response time but leaves thermocouple wires unprotected against
corrosive or mechanical damage.
As shown in the next illustration, using an exposed junction thermocouple can
result in removal of channel-to-channel isolation. Isolation is removed if
multiple exposed thermocouples are in direct contact with electrically conductive
process material.
To prevent violation of channel-to-channel isolation:
1769sc-IT6I
User's Manual Pub. 0300244-02 Rev. A
B-3