Abstract: An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

Abstract: An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

Abstract: An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

Abstract: A magnetic flowmeter includes a conduit and an electrical coil for generating a magnetic field extending through the conduit. A coil driver is configured to energize the coil and generate a periodically reversing magnetic field. Electrodes are arranged to detect voltages generated by flow of a conductive fluid through the magnetic field. A measurement system measures fluid flow rate using voltages detected by the electrodes. An empty conduit detector receives signals from the electrodes and determines whether or not the electrodes are immersed in the conductive fluid by analyzing the signals from the electrodes. The flowmeter optionally includes a low-flow verification system for distinguishing true low or zero flow rate measurements from measurements caused by the electrodes being exposed above the fluid level in the conduit by assessing whether or not EMF induced by magnetic flux change can be detected.

Abstract: A magnetic flowmeter includes a conduit and an electrical coil for generating a magnetic field extending through the conduit. A coil driver is configured to energize the coil and generate a periodically reversing magnetic field. Electrodes are arranged to detect voltages generated by flow of a conductive fluid through the magnetic field. A measurement system measures fluid flow rate using voltages detected by the electrodes. An empty conduit detector receives signals from the electrodes and determines whether or not the electrodes are immersed in the conductive fluid by analyzing the signals from the electrodes. The flowmeter optionally includes a low-flow verification system for distinguishing true low or zero flow rate measurements from measurements caused by the electrodes being exposed above the fluid level in the conduit by assessing whether or not EMF induced by magnetic flux change can be detected.

Abstract: An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.