Development of weighing tank system employing rotating double wing diverter

A new design for a diverter and weighing tank system has been developed. Experiments have been carried out on a prototype. Diverter wings are set as partitions along the diameter of a half-cylinder tube. The rotation axis is at the center of the half cylinder and runs parallel to liquid jets flowing vertically downward from several independent nozzles. This design contributes to small diverter timing error, compact design, small wet area, a simple and robust mechanism, easy implementation of the ISO4185 test, and easy adjustment of diverter trigger timing. After adjustment of start and stop signal timings, the estimated standard uncertainty caused by diverter timing error is reduced within a negligible small value (0.0019% or less) over a wide range of flow rates at any nozzle position. The weighing tank system has been improved by some refined devices. A single movement of the weighing platform can prevent escaping vapor, enable connection of an air tube, provide protection against impact, and provide a fail-safe against overflow. It is confirmed that the liquid flow calibration facility using the present system achieves accurate measurement, easy operation, wide flow range, high throughput, low cost, small weighing tank, easy maintenance, and safety.