| 摘要 |
A method for manufacturing a conduit pipe and the conduit pipe for electromagnetic flow meter are disclosed. The conduit pipe (101) comprises a resin-made conduit pipe having inside a passage for conductive fluid, and a measurement section formed in the intermediate portion of the conduit pipe along the direction of the passage. The measurement section (108) has a pair of electrodes (105a, 105b) for electromotive force measurement and a pair of conductive members (111a, 111b). The pair of electrodes are arranged so as to meet nearly at right angles with the flow direction of the conductive fluid passing through the conduit pipe and each electrode includes a front end nearer to the passage and a rear end distal to the front end. Each electrode includes a front end surface exposed to the inner wall surface of the conduit pipe. The pair of conductive members is each connected, inside the wall of the conduit pipe, to a rear end side of either of the pair of electrodes for electromotive force measurement. The electrodes for electromotive force measurement are moulded integrally with the conduit pipe so as to be embedded in the wall of the conduit pipe. Either a) the rear ends of the electrodes are covered with the resin constituting the conduit pipe, a seal material is provided at the boundary between the conduit pipe and the electrodes for electromotive force measurement are embedded in the inner wall of the conduit pipe or b) recesses are formed at the periphery of the conduit pipe in a direction meeting at right angles with the direction in which the pair of electrodes for electromotive force measurement are arranged, each recess is for fixing a yoke and a stake in each recess for fixing a yoke, to engage with the hole formed in the yoke, is formed integrally with the conduit pipe.
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