| 摘要 |
PURPOSE:To achieve a lower cost of an electromagnetic flowmeter detector, by keeping an earth object in contact with a liquid to make a liquid in a measuring tube conductive to the measuring tube while the measuring tube is grounded. CONSTITUTION:An earth object 6 comprising a conducting piece is provided at the end of an electrically insulating lining 3a of a measuring tube 2 with one end thereof exposed from the liquid contact surface of the lining 3a and buried securely into a lining addition layer 3b together with a lead conductor 7 of the measuring tube connected to the other end of the object 6. With the liquid contact of the object 6, a fluid in the measuring tube 2 is made conductive to the measuring tube 2 to allow the grounding of the measuring tube 2 thereby enabling a reduction in the cost eliminating any metal earth ring.
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