초록 ▼

A flowmeter has a tank disposed between a discharge circuit and a supply circuit from which the tank is refilled when the level of the liquid in the tank falls below a predetermined level. A plunger is suspended in the tank by a force sensor. The output of the force sensor is used to measure the rat

A flowmeter has a tank disposed between a discharge circuit and a supply circuit from which the tank is refilled when the level of the liquid in the tank falls below a predetermined level. A plunger is suspended in the tank by a force sensor. The output of the force sensor is used to measure the rate of flow from the tank to the discharge circuit except when the tank is being refilled. Flow from the tank during a refilling cycle is approximately measured in response to flow parameters in the discharge circuit which are independent of the force sensor and liquid level in the tank. The flow parameters in the discharge circuit are monitored and calibrated during each tank discharge cycle, and the new calibration values are used during the next tank refilling cycle, to obtain reasonably accurate continued flow measurement during each tank refilling cycle.

대표청구항 ▼

A flowmeter having a tank disposed between a discharge circuit in which the rate of flow is to be measured and a supply circuit from which the tank is refilled when the liquid level in the tank falls below a predetermined value, and a plunger suspended in the tank via a force sensor providing an out

A flowmeter having a tank disposed between a discharge circuit in which the rate of flow is to be measured and a supply circuit from which the tank is refilled when the liquid level in the tank falls below a predetermined value, and a plunger suspended in the tank via a force sensor providing an output signal indicative of flow from the tank to the discharge circuit, means independent of the tank and the plunger to continuously supply a signal which is approximately representative of the rate of flow in the discharge circuit, and means responsive to said output signal of the force sensor outside of refilling cycles of the tank for calibrating said means independent of the tank and the plunger, so that reasonably accurate flow measurement is obtained during a refilling cycle of the tank.