In view of disadvantages of commercially available oil level sensing products, this paper introduces a new mechanical type of oil sensor for refrigeration compressor’s oil level protection, which is used to avoid failure due to lack of oil in the compressor, especially when multi-compressors were connected in parallel. The paper analyzed this new mechanical oil senor in terms of superiority comparing with other type oil sensor, theoretical working principle, design concept, functional test and typical application on multi-compressors system. The method of installation and the system control logic are also discussed.
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