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Preventive Maintenance

h-pd-2EDE H-PD-2 Heater Power Detector

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fluke_435IIFluke 435 II Energy Analyzer

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Fluke Model 438Fluke 438 II Motor Analyzer

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Preventive maintenance is usually defined as maintenance of equipment or systems before a fault or failure occurs. While preventive maintenance is worthwhile, there are risks to relying solely on this type of maintenance. Equipment failure can occur due to human error, weather problems and many other types of environmental  contaminates that are not taken into account. Preventive maintenance takes a proactive approach to scheduled overhauls or replacement of components. However, it does not take into account the day to day problems that can occur. Common methods to determine what maintenance activity or other failure management policies should be applied are; manufacturer recommendations, requirements of codes or legislation, what an expert in the specific industry suggests, maintenance that is done on similar equipment, and most importantly measured values and performance indications.

Tools to assist the maintenance professional in quickly indicating if a problem exists are limited and often overlooked in the planning of preventive maintenance. Time saving mechanisms can not only save time but huge amounts of money and don’t have to involve complicated testing regimes.

For instance what protects an electric motor from absorbing water? Water intrusion is a significant problem with motors. Condensation is one way that causes water intrusion. The thermal mass of the motor causes it to lag behind ambient temperature. When the motor is cooler than the dew-point, water droplets condense out of the air and deposit on the motor, including the interior spaces. Why? Because the interior spaces temperature lags behind the furthest, leading to the greatest delta in temperature. Once inside, it is extremely difficult to force back out, leaving the electric motor virtually unusable.

Motor heaters are used to keep the motor and its interior spaces above ambient temperature – but what ensures these heaters functionality? Usually nothing. EDE has development a simple tool that helps the maintenance professional visually verify heater operation quickly.


  • Monitoring of the alternating current electric heater circuit used in motors, generators, switch gear cabinets, lube oil pre-heaters and other types of re-heaters.
  • Monitor other constant current circuits for activity.
  • Early notification of electric motor heater status.


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Need help or a have a question? 970-461-1348