Air filter restriction indicating device

Details Air filter restriction indicating device Air filter restriction indicating device

G - Physics

01

L

183/93, 116/67.5

G01L 7/16 (2006.01)

Patent

CA 1106705

ABSTRACT An air filter restriction indication device communicating with the supply of air passing from an air filter to the air intake of an internal com- bustion engine. The indicating device senses a decrease in the supply of air drawn through the air filter by the engine based upon changes in the amount of vacuum in the negative side of the air supply, the amount of restriction being indicated by the movement of an indicating device. Improved means included in the indicating device senses the movement of the indicating device and progressively locks the indicating device into various indicating positions as the vacuum increases due to an increased restriction of the filter, so that the maximum reading of restriction achieved during engine operation remains visible to the operator or maintenance personnel even after the engine is turned off.

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