System and method for remote monitoring of tank levels

摘要

Embodiments of the invention are described including a remote level monitoring device. The remote level monitoring device includes a ping source for placement on a tank containing a liquid. The ping source provides a ping signal that is transmitted into the tank. In a preferred embodiment, the ping signal is an ultrasonic signal. A transducer is provided for receiving reflections of the ping signal off of the top surface of the liquid. The difference between the time the ping is sent and the time it is received indicates the top level of the liquid in the tank. A signal indicating the level is transmitted to a central monitoring facility. Preferably, the signal is transmitted via a communications satellite. Refilling trucks are then sent to the remote site to refill the tank when the level signal indicates that refilling is necessary.