Jet sensor device

Claim 1

A jet sensor comprising a notched body, a first supply passage in said body opening into the notch in said body, a sensing passage in said body opening from said notch in alignment with said first supply passage for normally receiving a sensing jet of fluid from said first supply passage across said notch, an orifice plug removably seated in said sensing passage adjacent said notch and having a through orifice in part defining a fluid flow path through said sensing passage, and a second supply passage in said body for directing a sensing passage clog preventing flow into said sensing passage, said orifice plug having an external peripheral flow passage aligned with said second supply passage for receiving clog preventing fluid flow therefrom and a second orifice extending from said peripheral flow passage into said through orifice in angular relation thereto and generally facing said first supply passage for directing said clog preventing flow in positive opposing relation to normal sensing flow of fluid through said sensing passage from said first supply passage across said notch; said second supply passage, said peripheral flow passage and said second orifices being of sizes to assure said clog preventing flow being sufficiently great to constantly flow into said notch.