Fluid pressure monitoring system

Claim 2

Apparatus for measuring pressure in a tubular line by detecting expansion of the line comprising a pair of spaced apart arms, a bridging member having opposite ends joined to said arms intermediate the ends thereof, said arms on one side of said bridging member defining a passage therebetween for receiving a line therethrough, coupling means on said arms for releasably clamping said member to a line through said passage, said bridging member being constructed and arranged to flex upon expansion of a line clamped in said passage, a transducer effective to produce a signal which varies as a function of a force applied thereto supported on one of said arms on the other side of said bridging member, and a force-transmitting member Carried by the other of said arms on said other side of said bridging member arranged to vary the force on said transducer upon deflection of said arms.

Claim 3

The device of claim 1 wherein the point of contact of said force-transmitting member on said transducer may be selected to vary the signal output of said transducer.

Claim 4

The device of claim 2 wherein said force-producing member is movable along said other arm.

Claim 5

The device of claim 1 further including means for adjusting the position of said force-transmitting member with respect to said transducer.

Claim 6

The device of claim 1 wherein said transducer is a pressure-sensitive transistor.

Claim 7

The device of claim 1 wherein said transducer is a strain-sensitive resistance.

Claim 8

The device of claim 1 wherein said transducer comprises strain-sensitive resistance elements connected in a bridge circuit.

Claim 9

The device of claim 1 wherein said transducer comprises a beam-like piezoelectric element carried by said one of said arms.

Claim 10

The device of claim 1 wherein said coupling means includes a member slidable in one of said arms to engage a line in said passage, a pivoted cam supported from said one of said arms and arranged to engage said slidable member so that upon pivoting of said cam said slidable member is moved toward a line clamping position.

Claim 11

Apparatus for measuring the pressure in a tubular line, comprising a pair of spaced apart arms, a bridging member having opposite ends joined to and spacing said arms intermediate the ends of said arms, releasable clamping means carried on said arms on one side of said bridging member for clamping a line between said arms, said bridging member being constructed and arranged to flex upon expansion of a line in said clamping means, transducing means connected between said arms on the other side of said bridging means and responsive to deflection of said arms upon flexing of said bridging member to produce a signal which varies as a function of the expansion of a line in said clamping means, said clamping means including a member movable in one of said arms to engage a line in said clamping means, a pivoted cam supported from said one of said arms and arranged to engage said slidable member so that upon pivoting of said cam said slidable member is moved toward a line clamping position.

Claim 12

Apparatus for measuring the pressure in a tubular line, comprising a pair of spaced apart arms, a bridging member having opposite ends joined to and spacing said arms intermediate the ends of said arms, releasable clamping means carried on said arms on one side of said bridging member for clamping a line between said arms, said bridging member being constructed and arranged to flex upon expansion of a line in said clamping means, transducing means connected between said arms on the other side of said bridging means and responsive to deflection of said arms upon flexing of said bridging member to produce a signal which varies as a function of the expansion of a line in said clamping means, said clamping means including a member movable in one of said arms to engage a line in said clamping means, a pivoted cam supported from said one of said arms and arranged to engage said slidable member so that upon pivoting of said cam said slidable member is moved toward a line clamping position.