Predictive maintenance - infrared thermal imaging
Predictive maintenance
Infrared thermal imaging is the first line of defense in predictive maintenance programs. Temperature change is a key parameter for equipment monitoring, and because the camera is non-contact, the technician can quickly measure the temperature of the equipment without the equipment having to stop working. The thermal imager is especially prominent in unit measurements relative to spot measurements.
Unlike an infrared thermometer that only captures the temperature at a point, the camera displays the entire temperature characteristic of an object on a two-dimensional picture. The technician can then check the surface temperature of the critical components and the entire unit, or compare the known good units to the suspected units to quickly determine the next direction of investigation. The camera can also store previous and up-to-date images for comparison or upload to a central database.
Common use
Monitor and measure bearing temperatures in large motors or other rotating equipment.
Identify "hot spots" in electrical equipment.
Identify leaks in sealed containers.
Look for insulation damage in process piping or other insulation processes.
Find termination faults in high power electrical lines.
Locate the overload breaker in the power strip.
Identify fuses that are at or near their rated capacity.
Identify faults in the electrical switching device.
Capture process temperature readings.
Application Reference - Motor Operating Temperature
A pump control unit failure occurred in a paper mill. The thermal image indicates that the temperature of a phase in the three-phase power is too high, indicating that the current absorbed by the unit through the phase is too large. The maintenance personnel completed the requirements of the work order and tried to repair the pump controller. However, when the maintenance was subsequently evaluated, the thermal image showed an increase in the temperature of the two phases.
The maintenance personnel performed a second repair, but the temperature of all three phases increased. They removed the entire device and replaced it. Complete all tests and repairs before a catastrophic failure. There was no loss of production time and no damage or loss of semi-finished materials. Effective predictive maintenance, including thermal imaging, solves small problems before they become large failures.
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