Control and analysis circuit device for measuring reaction heat

Details Control and analysis circuit device for measuring reaction heat Control and analysis circuit device for measuring reaction heat

1993-06-18

1994-11-01

Gutierrez, Diego F. F.

Thermal measuring and testing

Calorimetry

Heat value of combustion

374164, 73 2331, 73 2501, 422 94, G01N 2522, G01N 2712

Patent

active

053602668

ABSTRACT:
The reaction heat sensor and control and analysis devices for measuring the concentration of reactive species in a medium includes a temperature dependent measuring resistor and a reference resistor connected in series. Both resistors, which are supplied with a constant alternating current by a constant current generator, are heated with a heating resistor. By analysis of the voltage drop at the reference resistor the heating resistor is regulated so that the temperature of the reference resistor and thus its reference resistance is kept constant. Thus it is guaranteed by control circuitry that the temperature of the measuring resistance is kept constant when no heat is generated by reaction on exposure to the medium. If a reaction occurs at the measuring resistor, the temperature of the measuring resistance changes and with it the voltage drop across the measuring resistor, which is analyzed and is a direct measure of the heat produced by the reaction.

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