Differential pressure indicator with temperature compensation

Details Differential pressure indicator with temperature compensation Differential pressure indicator with temperature compensation

1990-11-05

1992-01-14

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340626, 340607, 73708, 7386142, 200 819R, G08B 2100

Patent

active

050814486

ABSTRACT:
An oil filter for filtering oil is combined with a differential pressure indicator with temperature compensation. The differential pressure indicator has a spool assembly slidably disposed in a spool insertion cylinder in axially confronting relation to a terminal which is connected through a warning lamp to a battery. The spool assembly comprises a spool body disposed for axial sliding movement in the spool insertion cylinder, a contact member disposed for axial sliding movement in the spool body and having a contact pin movable out of one of the spool body, and a spring of a shape-memory alloy, restorable to a memorized shape when the oil is in a predetermined temperature range, for biasing the contact member to move the contact pin out of the spool body towards the terminal. When a differential pressure in excess of a predetermined level is developed in the oil and applied to the spool assembly, the differential pressure acts to move the spool assembly towards the terminal. The contact pin is brought into electric contact with the terminal only when the shape-memory spring restores its memorized shape at the time the oil is in the predetermined temperature range.

REFERENCES:
patent: 3239622 (1966-03-01), Clason

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