There is a problem in that, in a liquid crystal display panel in which a color filter is formed on an opposing substrate, it is necessary to assemble an element substrate and the opposing substrate by extremely high precision position alignment, and when this precision is low, the aperture ratio decreases and the display becomes darker. The system for calculating a flow rate of a flow meter using multiple modes comprises a means for calibrating the flow meter for a number of desired modes. A current dampening device is connected in parallel with the motor downstream from the switch to dampen transient current.