Turbine flow meter
A common approach to measure the rate of fluid flow is a turbine flow meter in which a turbine is caused to rotate in a passage through which the fluid is directed. The rate of rotation of the turbine is directly proportional to the velocity of fluid flow, and by measuring such rate of rotation, a flow rate indication may be obtained. Turbine flow meters for metering the rate of a flow of fluid to be measured utilize an arrangement which involves detecting the rotational speed of a turbine rotating in response to the velocity of the fluid flow such as to produce pulses and integrating the pulses either to indicate the integrated value or output a signal representing a unit amount of the fluid when the integration reaches or exceeds a predetermined value. Turbine meters are commonly used for large volume gas flow measurement applications where accuracy and rangeability are essential. When calibrated, properly maintained, and used in steady flow conditions, turbine meters can provide reliable and accurate fluid metering. A turbine flow meter comprises a multi-bladed rotor which runs between bearings and is situated in a flow conduit. The transducer which is located in a wall of the flow conduit senses passage of the blades on the rotor. Fluid passing through the turbine causes it to rotate about its axis. The rotational speed of the turbine is a direct function of flow rate and is typically sensed by magnetic pick-up, photoelectric cells or tachometer means. Flow rate totaled for a given period of time is proportional to flow volume. The rotor has a speed of rotation which is to some extent proportional to the flow rate of fluid passing through the conduit. The rotational velocity of the fan is roughly proportional to the rate at which liquid flows through the meter. The rotational velocity is converted into a train of pulses by a transducer.
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