Patent ID: 6411192
Filing Date: 2002-06-25
Classification: G01F,G01K,H01C

Abstract:
A sensor for at least one property of a fluid, said sensor comprising:(a) a single body of positive-temperature-coefficient material, (b) said body being circular in configuration and having a first side and a second side, (c) said body having within it a first zone, a second zone, and a third zone, each of said zones having a sectoral cross section and being adjacent to both said first side and said second side of said body, (d) said zones being in direct electrical communication with one another only through said body, (e) the Curie transition temperature of said material of said body being higher than the temperature of said fluid, (f) a source of steady electric potential, (g) means for applying said steady electrical potential to said first side of said body, (h) means for thermally coupling one of said sides of said body to said fluid, and (i) first, second and third resistive means for connecting respective ones of said first, second, and third zones to points of electric potential different from said steady electric potential, (j) said first, second, and third resistive means being adapted to furnish respective voltage signals.