A thermocouple is a crucial component in many temperature control systems. When it starts to fail, it can lead to inaccurate readings and potential safety issues. Here are the main symptoms to watch out for.
What are the Symptoms of a Bad Thermocouple? 4 Key Indicators
1. Controller Displaying 'b.o' (Burn Out)
If your controller displays 'b.o', it means the thermocouple is likely dead. This message is a clear indicator that the thermocouple is no longer functioning correctly and needs to be replaced. The 'b.o' message is a programmed response in the controller to signal a failure in the thermocouple.
2. Inaccurate Temperature Readings
Thermocouples generate a small electrical signal in millivolts when heated. Over time, the wires degrade with each thermal cycle, causing the signal to change. This degradation can lead to inaccurate temperature readings. The furnace may still display a temperature, but it could be off by over 100 degrees, leading to incorrect process temperatures.
3. Open Circuit When Checked for Resistance
After removing the thermocouple, checking the resistance can reveal if it is an open circuit. This test involves measuring the resistance of the thermocouple wires. An open circuit suggests a break in the thermocouple, which prevents it from functioning correctly.
4. Critical Indicators of Failure
These symptoms are critical indicators that the thermocouple is failing or has failed. Immediate inspection and potential replacement are necessary to ensure accurate temperature control and prevent process failures or safety issues.
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