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Title: Isolated thermocouple amplifier system for stirred fixed-bed gasifier

Abstract

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.

Inventors:
 [1]
  1. Morgantown, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
868539
Patent Number(s):
5163754
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01K - MEASURING TEMPERATURE
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
isolated; thermocouple; amplifier; stirred; fixed-bed; gasifier; sensing; provided; determining; bed; temperature; profile; including; plurality; sensors; levels; transmitter; transmitting; data; based; outputs; remote; operator; station; battery-based; power; supply; isolation; comprising; circuits; amplifying; individual; comprise; operational; connected; sensor; flying; capacitor; circuit; operation; controlling; application; output; sample; hold; transfer; timing; control; activating; predetermined; timed; sequence; bed temperature; data base; temperature profile; circuit connected; predetermined time; control circuit; power supply; temperature sensor; amplifier circuit; temperature sensors; hold circuit; operational amplifier; transmitting data; amplifier connected; fixed-bed gasifier; individual sensor; gasifier including; bed gasifier; data based; determined time; /374/

Citation Formats

Fasching, George E. Isolated thermocouple amplifier system for stirred fixed-bed gasifier. United States: N. p., 1992. Web.
Fasching, George E. Isolated thermocouple amplifier system for stirred fixed-bed gasifier. United States.
Fasching, George E. Wed . "Isolated thermocouple amplifier system for stirred fixed-bed gasifier". United States. https://www.osti.gov/servlets/purl/868539.
@article{osti_868539,
title = {Isolated thermocouple amplifier system for stirred fixed-bed gasifier},
author = {Fasching, George E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

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