What Are the Symptoms of an Aging Air Compressor Temperature Sensor?

I. Display Symptoms (Most Obvious)

• The display shows a high temperature (such as above 40°C or 50°C) immediately after startup, even when the unit is still cold, which is obviously unrealistic.
• The displayed temperature does not change, rises extremely slowly, or stays fixed at a certain value during operation.
• The temperature reading fluctuates erratically up and down without any pattern, indicating signal drift.
• The controller triggers alarms such as high temperature, sensor open circuit, or sensor fault, and the alarm reappears soon after resetting.

II. Mismatch with Actual Temperature (Most Accurate Judgment)

• Measure the temperature of the main unit or oil pipe with an infrared thermometer and compare it with the display.
• If the difference exceeds 5°C to 8°C, the sensor can basically be judged as aging.
• If the difference exceeds 10°C, the sensor has failed and must be replaced.

III. Fault Symptoms (Reverse Judgment)

• The unit frequently shuts down due to high temperature even though it is not actually hot.
• The temperature display remains abnormal after cleaning the radiator and replacing the lubricating oil.
• The performance is unstable: sometimes normal, sometimes showing an extremely high reading.
• The displayed temperature changes suddenly when the sensor wire or connector is touched.

IV. Judgment by Appearance and Service Life

• The probability of aging is very high after 1 to 2 years of use or 2,000 to 3,000 operating hours.
• The cable becomes hard, cracked, or deteriorated; the connector is oxidized or burned.
• Sensors age prematurely in harsh environments: high temperature, heavy dust, and strong vibration.

Summary