| 摘要 |
A fluid flow sensor is provided for use in a remote location from a fluid delivery system, such as a lubricant or grease delivery system for lubricating parts. The fluid flow sensor includes a body defining a lubricant conveying passageway having a seat, and a poppet configured to engage the seat. The poppet is biased against the seat by a spring, but is moveable off the seat when fluid is moved through the passageway. The poppet includes a rod that extends upstream from the poppet through an aperture in the passageway, and a piston is positioned abuttingly against the end of the rod and biased against the rod by a spring so that the piston will move with the poppet as the poppet is moved off the seat in a first direction. A proximity switch is positioned perpendicularly to the first direction adjacent the piston. The piston is adjustable along the first direction, and the proximity switch is adjustable in the perpendicular direction, such that the sensitivity and hysteresis of the sensing arrangement can be adjusted and set to desired levels. By this arrangement, fluid quantities of as little as 0.001 cubic inch can be accurately sensed at an actuation or cycle frequency of about 100 milliseconds.
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