Electromagnetic flowmeter having removable electrode leads

Claim 2

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube: said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein; and said conduit means exiting from the flow tube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; there being potting material encapsulating said magnetic field coil means and said conduit means, said electrode lead means being kept by said conduit means from being contacted by said potting material, and there being electrode housings in said flow tube, said electrode housings housing and providing external access to said electrodes, and keeping said electrodes from contacting said potting material; said electrode housings also having connections to said conduit means and having said electrode lead means extending through such connections and thereinto.

Claim 3

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein and said conduit means exiting from the flow tube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; said conduit means being between said bore means and said flow tube, and exiting from said flow tube at each said electrode, and at a point on said flow tube between said electrodes.

Claim 4

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein and said conduit means exiting from the flow tube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; said conduit means being between said bore means and said flow tube, and exiting from said flow tube at each said electrode, and at a point on said flow tube between said electrodes.

Claim 5

The electromagnetic flowmeter of claim 2 wherein said field coil means is in said flow tube and, along with said conduit means are encapsulated by potting material between said flow tube and said bore means.

Claim 6

The electromagnetic flowmeter of claim 3 wherein said field coil means is isolated from direct contact with said potting material by coil boxes.

Claim 7

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein; said conduit means exiting from the flowtube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; said conduit means including a first conduit between said bore means and said flow tube, and exiting from said flow tube at one end of said first conduit and at one said electrode, and a second conduit between said bore means and said flow tube, and exiting at one end thereof from said flow tube and at the other said electrode, and the other end of each said conduit exiting from said flow tube at a point between said electrodes.

Claim 8

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein; said conduit means exiting from the flowtube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; said conduit means including a first conduit between said bore means and said flow tube, and exiting from said flow tube at one end of said first conduit and at one said electrode, and a second conduit between said bore means and said flow tube, and exiting at one end thereof from said flow tube and at the other said electrode, and the other end of each said conduit exiting from said flow tube at a point between said electrodes.

Claim 9

The electromagnetic flowmeter of claim 5, wherein said field coil means is in said flow tube and, along with said conduit means are encapsulated by potting material between said flow tube and said bore means.

Claim 10

The electromagnetic flowmeter of claim 6, wherein said field coil means is isolated from direct contact with said potting material by coil boxes.

Claim 11

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein; and said conduit means exiting from the flow tube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; each said electrode being part of an electrode assembly sealingly and removably mounting said electrode in the wall of said bore means, with one end of such electrode exposed inside said bore means; said lead means including lead wires and the other end of each said electrode being external to said flow tube and having one of said lead wires connected to it, with such lead wire coming off such connection and going into said conduit means; said conduit means being smoothly curved conduits each connected at one end to a said electrode assembly and having non-damaging interior surfaces, the other ends of said conduits being connected to a feedthrough located at a point on said flow tube between said electrodes.

Claim 12

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means creates a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means in said flow tube, said conduit means having said electrode lead means removably contained therein; and said conduit means exiting from the flow tube to the exterior thereof for providing access to said electrode lead means from the exterior of said flow tube for removing said electrode lead means from said flow tube; each said electrode being part of an electrode assembly sealingly and removably mounting said electrode in the wall of said bore means, with one end of such electrode exposed inside said bore means; said lead means including lead wires and the other end of each said electrode being external to said flow tube and having one of said lead wires connected to it, with such lead wire coming off such connection and going into said conduit means; said conduit means being smoothly curved conduits each connected at one end to a said electrode assembly and having non-damaging interior surfaces, the other ends of said conduits being connected to a feedthrough located at a point on said flow tube between said electrodes.

Claim 13

The electromagnetic flowmeter of claim 8, each electrode assembly having an electrode housing communicating with the corresponding said conduit, said housing having a cap, said cap being removable to expose the connection of the electrode lead wire and electrode end, and also the entrance of the corresponding said lead wire into the conduit means.

Claim 14

The electromagnetic flowmeter of claim 8, wherein said conduit means comprises a pair of said conduits for each electrode, the two ends of each such pair being connected to the corresponding said electrode assembly, and the other ends of each said pair being connected to said feedthrough.

Claim 15

The electromagnetic flowmeter of claim 8, wherein said conduits are between said bore means and said flow tube, and exit from said flow tube at each said electrode and at said feedthrough.

Claim 16

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means create a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means associated with said flow tube, said conduit means providing access to said electrode lead means and from the exterior of said flow tube, said conduit means having said electrode lead means removably contained therein, and said conduit means being between said bore means and said flow tube, and exiting from said flow tube at each said electrode, and a point on said flow tube between said electrodes.

Claim 17

An electromagnetic flowmeter having a flow tube, spaced electrodes, and electrode lead means in said flow tube; said flowmeter also having bore means in said flow tube for having liquid flow therethrough, magnetic field coil means, and measuring circuitry external to said flow tube, said measuring circuitry being connected by said lead means to said electrodes for measuring voltages arising at said electrodes in response to a flow of conductive liquid through said bore means and between said electrodes while said magnetic field coil means create a magnetic field in said flow, transverse thereto, and between said electrodes; said flowmeter also having the improvement including conduit means associated with said flow tube, said conduit means providing access to said electrode lead means and from the exterior of said flow tube, said conduit means having said electrode lead means removably contained therein, and said conduit means being between said bore means and said flow tube, and exiting from said flow tube at each said electrode, and a point on said flow tube between said electrodes.

Claim 18

The electromagnetic flowmeter of claim 12 wherein said field coil means is in said flow tube and, along with said conduit means are encapsulated by potting material between said flow tube and said bore means.

Claim 19

The electromagnetic flowmeter of claim 13 wherein said field coil means is isolated from direct contact with said potting material by coil boxes.

Claim 20

The electromagnetic flowmeter of claim 12, wherein said conduit means includes a first conduit between said bore means and said flow tube, and exiting from said flow tube at one end of said first conduit and at one said electrode, and a second conduit between said bore means and said flow tube, and exiting at one end thereof from said flow tube and at the other said electrode, and the other end of each said conduit exiting from said flow tube at a point between said electrodes.

Claim 21

The electromagnetic flowmeter of claim 15, wherein said field coil means is in said flow tube and, along with said conduit means are encapsulated by potting material between said flow tube and said bore means.

Claim 22

The electromagnetic flowmeter of claim 16, wherein said field coil means is isolated from direct contact with said potting material by coil boxes.