Method and apparatus to measure the operating temperature of sol

Details Method and apparatus to measure the operating temperature of sol Method and apparatus to measure the operating temperature of sol

1982-03-12

1983-12-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204408, 204425, G01N 2758

Patent

active

044191901

ABSTRACT:
To provide for temperature measurement of a solid electrolyte polarographic gas composition sensor, an ac signal is superimposed from an ac voltage source (2) on the applied voltage from a voltage source (1) if the sensor is a polarographic sensor, the ac signal being separated from the output by a filter combination (6, 7), the dc output being evaluated as usual, and the ac output being rectified in a rectifier (9) to obtain a measure of the temperature since the ac resistance (R.sub.alt) is highly temperature dependent (see FIG. 3). The ac preferably is about 10% of the applied dc voltage, so that the voltage swing of the ac potential falls well within the linear range of output current with respect to voltage (see FIG. 2). The output from the ac channel (7, 9) to evaluate the temperature signal can be connected to a control loop circuit (10, 11), including a heater (11) to heat the sensor to maintain a uniform temperature thereof.

REFERENCES:
patent: 4356065 (1982-10-01), Dietz
patent: 4376026 (1983-03-01), Hoffman et al.

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