Non-contact fluid resistivity measurement

A method for measuring fluid resistivity, comprising:

• introducing a first fluid into a first non-conductive tube;
• introducing a second fluid into a second non-conductive tube, wherein the second non-conductive tube is sealed;
• generating a first electromagnetic field within the first non-conductive tube and the first fluid with a first transmitter disposed around an outer surface of the first non-conductive tube, wherein the first electromagnetic field causes a first eddy current within the first fluid, and the first eddy current generates a first secondary electromagnetic field;
• receiving at a first receiver positioned within a bore of the first non-conductive tube the first electromagnetic field and the first secondary electromagnetic field at a first receiver disposed around the outer surface of the first non-conductive tube;
• generating a second secondary electromagnetic field within the second non-conductive tube and the second fluid with a second transmitter disposed around an outer surface of the second non-conductive tube, wherein the first transmitter and the second transmitter are connected in series;
• receiving the first electromagnetic field and the first secondary electromagnetic field at a second receiver positioned within a bore of the second non-conductive tube, wherein the first receiver is connected to the second receiver;
• and
• calculating a resistivity value of the second fluid based, at least in part, on a combined output from a circuitry coupled between the first receiver and the second receiver, wherein the combined output corresponds to an eddy current generated by the first secondary electromagnetic field within the first fluid and the second secondary electromagnetic field within the second fluid detected at the circuitry.