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Set of moving device that fitted into a closed conduit driven directly by water flow. Its turbine rotor rotates about the axis which is perpendicular to water flow.     WORKING PRINCIPLES:   Water flow drives vane rotate. Rotating times which is proportional to water flow speed are gathered, hence total volume passed through water meter is recorded.     CHARACTERS   1.Types: wet.  2.Wide measuring range, high accuracy.  3.Stable measuring capacity.  4.Long working life.  5.Low pressure loss.  6.All technical figures are conformed with GB/T778.1∼3-1996 which is equivalent to IS04064 Standard Class B. WORKING CONDITION:   .Water temperature≤45(Hot water meter≤90)  .Water pressure≤1Mpa      MAXIMUM PERMISSIBLE ERROR:   .From the minimum flow-rate (qmin) inclusive to the lower zone of the transitional flow-rate (qt