Patent ID: 9404952
Filing Date: 2016-08-02
CPC Classification: G01F,G01N,G01P,G01R

Claim Text:
1. A method comprising: providing a product into a first end of a conduit so that the product flows toward a second end of the conduit, wherein the conduit comprises an interior cavity, a first set of probes attached at a first location and a second set of probes at a second location, the first and second locations being separate from each other and being between the first and second ends; monitoring the conductivity of the product flowing in the conduit at the first location using current measured between the first set of probes; monitoring the conductivity of the product flowing in the conduit at the second location using current measured between the second set of probes; introducing a marker material into an entry port so that the marker material flows with the product toward the second end, the marker material comprising a conductivity that is substantially different than the conductivity of the product; detecting, at a first time, that the product conductivity determined at the first set of probes at the first location has changed due to the introduction of the marker material; and detecting, at a second time, that the product conductivity determined at the second set of probes at the second location has changed due to the introduction of the marker material.