Abstract: Control system for measuring/detecting transient fluid flow in a positive displacement pump lubrication system using time-differential pressure measurements. A pressure-actuated transducer for a captive oil column in the injection circuit imparts a proportional voltage signal to an electronically differentiating high pass filter, rendering it independent of any base line steady-state component. The resultant signal is fed into a comparator used to discriminate rates of pressure change against a preset reference level, thereby sensing transient spike pressures covering a wide range of adjustable frequencies and pump displacement strokes to thereby confirm required lubrication flow. The same transducer voltage signal transmitted during a steady-state portion of the pump cycle between injections is monitored for high and low set points such as incident to downstream blockage or system leakage.

Abstract: A "direct connection" fitting for co-axial outlets from an Injection Lubricator simultaneously engaging external air passage and internal lubricating oil passage outlets by the simple expedient of engaging an outer male and female threaded connection between the Injection Lubricator and any of several alternative fittings, thereby eliminating previously required preliminary internal flexible tube connections for the internal oil passage.