Isolated thermocouple amplifier system for stirred fixed-bed gasifier

Patent · Mon Nov 16 23:00:00 EST 1992

OSTI ID:7117674

Fasching, G E

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. 7 figs.

• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): US 5163754; A
• Application Number: PPN: US 7-390781
• OSTI ID: 7117674
• Country of Publication: United States
• Language: English

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47 OTHER INSTRUMENTATION
CONTROL EQUIPMENT
DATA TRANSMISSION SYSTEMS
DESIGN
EQUIPMENT
GAS GENERATORS
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
TEMPERATURE DISTRIBUTION
TEMPERATURE MEASUREMENT