What impacts does chemical corrosion have on thermocouple probes?

What impacts does chemical corrosion have on thermocouple probes?

Chemical corrosion will gradually damage the structure and performance of thermocouple probes, mainly reflected in the following aspects:

1. Corrosion of the protective sheathCorrosive gas, dust and molten substances in the furnace will erode the metal sheath, causing surface rust, pitting, thinning and even cracking. The sheath loses its protective effect, and external harmful substances can directly invade the interior.
2. Damage to internal thermocouple wiresAfter the sheath is damaged, corrosive media will oxidize and erode the core wires. This leads to changes in material composition and thermoelectric properties, resulting in inaccurate temperature readings, signal drift or complete loss of measurement function.
3. Circuit failureCorrosion at wiring terminals or wire joints causes poor contact, increased contact resistance, intermittent signals, short circuits or open circuits, making the probe unable to work normally.
4. Accelerated aging and shortened service lifePersistent chemical erosion accelerates material fatigue, greatly shortens the service life of the probe, and increases the frequency of replacement and maintenance costs.