System for monitoring flow rate difference in water cooling conduit
AssigneeHokushin Electric Works, Ltd.
InventorToru Hirano
Life of this patent
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Abstract
A system for monitoring the frequency difference between pulse output signals derived from a pair of flowmeters interposed, respectively, in the inlet and outlet lines of a flow conduit supplying cooling water to the tuyere of a blast furnace, the frequency difference being indicative of water leakage. The pulse output signals produced by the respective flowmeters during each predetermined measuring period are integrated. The integrated values are compared with each other, the difference therebetween being monitored whereby when the difference exceeds a predetermined set value, an alarm is generated.
Claims5
A system for monitoring the difference between the flow rate at the inlet and the flow rate at the outlet of a flow conduit to determine whether a disparity exists therebetween that is indicative of a leak in the conduit, said system comprising:
- p1 A. inlet and outlet vortex-shedding flowmeters in said conduit, each having a sensor probe to generate a pulse output signal whose frequency is a function of the rate of flow, said probes being subject to contamination giving rise to a spurious output signal;
- B. means including a pulse counter coupled to each flowmeter periodically to integrate the pulse output signals thereof developed during a predetermined interval to produce an integrated-value signal;
- C. means to determine the difference between the integrated-value signals of the inlet and outlet flowmeters to produce an integrated-value difference signal reflecting the existence of a disparity in the inlet and outlet flow rates, and
- D. means to compare the integrated-value difference signal with a set value to produce an alarm signal when the difference signal exceeds said set value.
Dependencies are inferred from the claim text.