Stabilized conductivity sensing system

G - Physics – 01 – N

Patent

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Details

G01N 27/02 (2006.01) G01F 23/24 (2006.01) G01N 27/06 (2006.01) G01N 27/07 (2006.01) G01N 27/60 (2006.01)

Patent

CA 2477822

A stabilized fluid conductivity measurement system includes a threaded metal housing (12) with an inner portion having two probes (20, 22) for contacting the fluid to be measured and having an outer portion in which electrical circuitry (30, 32) is mounted. The circuitry (30, 32) includes a balanced square wave generator (64) providing excitation to a modified Wheatstone bridge, including first (42) and second (44) input excitation terminals, and first (46) and second (48) output terminals. Fixed resistances (50, 52, 54) may be located in three arms of the Wheatstone bridge, and the fourth arm may have two resistances (56, 58) with an intermediate tap; and one of the two probes is connected to this tap while the other probe is connected to one of the input excitation points.

L'invention concerne un système stabilisé destiné à mesurer la conductivité de fluide et comprenant un compartiment métallique fileté dont une partie intérieure comporte deux sondes destinées à venir au contact d'un fluide à mesurer, et dont une partie extérieure renferme des circuits électriques montés dans celle-ci. Lesdits circuits comprennent un générateur d'ondes carrées équilibrées produisant une excitation sur un pont de Wheatstone modifié, et notamment une première et une seconde borne d'excitation d'entrée ainsi qu'une première et une seconde borne de sortie. Des résistances fixes peuvent être disposées dans trois bras du pont de Wheatstone, le quatrième bras pouvant comprendre deux résistances munies d'une prise intermédiaire. L'une des deux sondes est connectée à cette prise, l'autre sonde étant connectée à l'une des bornes d'excitation d'entrée.

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