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• Quenching (water and gas).
• Environments where electrical interference is present.
Ceramic-fiber- or Nextel™-insulated,
Type K
High-temperature probes operating over
the range 0–1,000°C/32–1,832°F. Designed
for maximum flexibility, the conductors
have a small diameter, typically 0.5 mm
(24 AWG). Applications include:
• Glass industry
• Some furnace applications, including
steel tempering
Ceramic-fiber-insulated probes are not suitable for use in carburizing atmospheres
or environments with potential electrical interference (e.g. vacuum furnaces).
Care and Maintenance of Thermocouples
The life expectancy of thermocouples depends on the severity of the operating
environment. Good care procedures will, however, maximize life.
Examination
Thermal-cycling the probes may cause (especially) mineral-insulated cables to
age, and eventually to become brittle. Replace immediately any thermocouples
with sheaths that show cracking or
Storing
When coiling cables for storage, ensure the diameter of the coil is not less than:
• 20 cm/8 in. for 1.5-mm/
• 40 cm/16 in. for 3-mm/
Testing
See p. 35.
Thermocouple Plugs
If your system has thermocouple plugs fixed together as part of an internal
wiring harness, it may be necessary to use a small amount of electrical lubricant
on the plugs if they become difficult to remove.
FURNACE TR ACK ER
WARNING
wear.
1 /
-in.-diameter sheaths.
16
1 /
-in.-diameter sheaths.
8
Basic Hardware
23
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