Coolant lifetime will vary greatly depending on operating conditions. For heavy use (full RF power for long times, high ambient temperature), check the coolant every 500 hours. If the load has only had light duty (fraction of full power, low ambient temperature), then coolant inspection may only be necessary every 2,000 hours.
Lifetime depends a lot on how the user is operating the load. Typical (silicone) oil life is ~5000hrs. at rated power & ‘nominal’ ambient conditions (25°C). Running loads at full rated power & high ambient conditions or 50Hz for units with blowers will shorten this estimate and visa-versa (lower average & cooler ambient will increase longevity.)
When in doubt, refer to the product manual for guidance.
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