Isolated thermocouple amplifier system for stirred fixed-bed gasifier

Patent · Tue Dec 31 23:00:00 EST 1991

OSTI ID:868539

Fasching, George E ^[1]

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1. Morgantown, WV

A sensing system is provided for determining the bed temperature profile of the bed of a stirred, fixed-bed gasifier including a plurality of temperature sensors for sensing the bed temperature at different levels, a transmitter for transmitting data based on the outputs of the sensors to a remote operator's station, and a battery-based power supply. The system includes an isolation amplifier system comprising a plurality of isolation amplifier circuits for amplifying the outputs of the individual sensors. The isolation amplifier circuits each comprise an isolation operational amplifier connected to a sensor; a first "flying capacitor" circuit for, in operation, controlling the application of power from the power supply to the isolation amplifier; an output sample and hold circuit connected to the transmitter; a second "flying capacitor" circuit for, in operation, controlling the transfer of the output of the isolation amplifier to the sample and hold circuit; and a timing and control circuit for activating the first and second capacitor circuits in a predetermined timed sequence.

• Research Organization: National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5163754
• OSTI ID: 868539
• Country of Publication: United States
• Language: English

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activating
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battery-based
bed
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circuits
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control
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fixed-bed
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predetermined
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temperature sensor
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