A fluid delivery system for measuring a substantially pure fluid product flow and preventing measurement of a multiphase fluid flow during delivery of a fluid product from a fluid source to a destination, the fluid delivery system comprising: a pump connected between the fluid source and the destination for delivering the fluid product from the fluid source to the destination; a Coriolis mass flowmeter connected between the pump and the destination and configured to detect a beginning of the multiphase fluid flow as the fluid product is delivered from the fluid source to the destination; and whereby said fluid delivery system further comprises: a back-pressure valve connected between the Coriolis mass flowmeter and the destination and configured to open or close under the control of the Coriolis mass flow meter; means within the Coriolis mass flowmeter for controlling the pump in response to detecting the beginning of the multiphase fluid flow to cause the pump to stop delivery of the fluid product from the source to the destination; means within the Coriolis mass flowmeter for controlling the back-pressure valve in response to detecting the beginning of the multiphase fluid flow to cause the back-pressure valve to close; and said Coriolis mass flowmeter prevents the measurement of a multiphase fluid flow by operating the pump controlling means and the back-pressure valve controlling means to stop the delivery of the fluid product in response to the detecting of the beginning of the multiphase fluid flow. a pump connected between the fluid source and the destination for delivering the fluid product from the fluid source to the destination; a Coriolis mass flowmeter connected between the pump and the destination and configured to detect a beginning of the multiphase fluid flow as the fluid product is delivered from the fluid source to the destination; and whereby said fluid delivery system further comprises: a back-pressure valve connected between the Coriolis mass flowmeter and the destination and configured to open or close under the control of the Coriolis mass flow meter; means within the Coriolis mass flowmeter for controlling the pump in response to detecting the beginning of the multiphase fluid flow to cause the pump to stop delivery of the fluid product from the source to the destination; means within the Coriolis mass flowmeter for controlling the back-pressure valve in response to detecting the beginning of the multiphase fluid flow to cause the back-pressure valve to close; and said Coriolis mass flowmeter prevents the measurement of a multiphase fluid flow by operating the pump controlling means and the back-pressure valve controlling means to stop the delivery of the fluid product in response to the detecting of the beginning of the multiphase fluid flow. a back-pressure valve connected between the Coriolis mass flowmeter and the destination and configured to open or close under the control of the Coriolis mass flow meter; means within the Coriolis mass flowmeter for controlling the pump in response to detecting the beginning of the multiphase fluid flow to cause the pump to stop delivery of the fluid product from the source to the destination; means within the Coriolis mass flowmeter for controlling the back-pressure valve in response to detecting the beginning of the multiphase fluid flow to cause the back-pressure valve to close; and said Coriolis mass flowmeter prevents the measurement of a multiphase fluid flow by operating the pump controlling means and the back-pressure valve controlling means to stop the delivery of the fluid product in response to the detecting of the beginning of the multiphase fluid flow.