Patent ID: 9581580
Date: 2017-02-28
CPC Classifications: G01N

Claim:
1. A measurement tool for measuring the dielectric constant and the electrical resistivity of a fluid, the measurement tool having a wall, the wall of the measurement tool being electrically insulating, the wall having a first side and a second side, the measurement tool being adapted for use with the fluid to the first side of the wall, the measurement tool having: a pair of capacitor plates mounted adjacent to the second side of the wall, a first signal generator for delivering an alternating electrical signal to at least one of the capacitor plates, a first detector for measuring a signal dependent upon the electrical capacitance between the capacitor plates, a first toroid mounted adjacent to a part of the second side of the wall, a second toroid mounted adjacent to another part of the second side of the wall, the pair of capacitor plates being located between the first and second toroids, a second signal generator connected to the first toroid for delivering an alternating electrical current to a coil of the first toroid, a second detector connected to the second toroid for determining the current flowing through a coil of the second toroid, and a return path conductor adapted for connection to the fluid to either side of the two toroids.