Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1976-12-13
1978-09-19
Gill, James J.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 724
Patent
active
041144465
ABSTRACT:
Measurement with a three-lead resistance thermometer uses two current sources to set up a current I in the thermometer element and each of its potential leads while a current of 2I is established in the current lead with all currents being in a direction such that the currents in the potential leads are in the same direction with respect to the thermometer element. A standard resistor is connected in series with one potential lead and a voltage measurement is made across the potential leads, including the standard resistor, to provide a measure of the temperature being sensed by the resistance thermometer. The current sources each utilizes a voltage divider connected between one terminal of a constant potential source and another terminal along with a follower circuit connected to receive an input from an intermediate point on the voltage divider. The follower circuit has a gain of magnitude corresponding with the reciprocal of the fraction of the potential used from the voltage divider and produces an output into a calibrating resistor through which a specific current is to be maintained. Each current source also includes a second voltage follower circuit for producing the potential at the other terminal of the voltage divider circuit as required to control the current in the calibrating resistor.
REFERENCES:
patent: 3651696 (1972-03-01), Rose
patent: 3754442 (1973-08-01), Arnett
patent: 3805616 (1974-04-01), Sugiyama
patent: 3864623 (1975-02-01), Luce
patent: 3906796 (1975-09-01), Dumbeck
patent: 3913403 (1975-10-01), Arcara
Gill James J.
Leeds & Northrup Company
MacKay Raymond F.
Miller, Jr. William G.
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