Patent ID: 7298278

Claim:
A method of detecting at least one of a delivery and a drain of product in a storage tank, the method comprising the steps of: monitoring at a first rate a product level in the tank; determining that at least one of the delivery or drain of product has begun; monitoring at a second rate the product level in the tank; determining that the at least one of the delivery or drain of product has ended; and transmitting information related to an amount of product delivered or drained during the at least one of the delivery or drain of the product; and wherein the step of determining that at least one of a delivery or drain of product has begun comprises the steps of: reading a first product level at the first rate before the at least one of the delivery or drain of product has begun; reading a second product level at the first rate; determining a difference between the first product level and the second product level; and indicating at least one of a delivery or drain of product has begun when the difference exceeds a threshold level of change.