Combined oil heater and level sensor

Details Combined oil heater and level sensor Combined oil heater and level sensor

1990-10-29

1991-11-05

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62129, 62472, 184 64, 1841041, 361 22, 417 13, F25B 4900

Patent

active

050622773

ABSTRACT:
A thermally protected heater element is located in an oil sump such that it is normally located beneath the surface of the oil whereby the oil is heated and acts as a heat sink relative to the heater element. If the oil level drops below the heater element, the thermal protection disables the heater element and the compressor whereby the location of the heater element defines the nominal minimum oil level.

REFERENCES:
patent: 3411313 (1968-11-01), Brown et al.
patent: 3744267 (1973-07-01), Norbeck
patent: 3876037 (1975-04-01), Rath, Jr.
patent: 4004431 (1977-01-01), Hildreth
patent: 4066869 (1978-01-01), Apaloo et al.
patent: 4090371 (1978-05-01), Keane
patent: 4720997 (1988-01-01), Doak et al.

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