Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-07-11
1991-07-23
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
73 232, G08B 1710
Patent
active
050347250
ABSTRACT:
Atmospheric concentrations of reducing gases are measured and indicated by a gas sensor whose conductivity varies in accordance with variations in the concentration of ambient reducing gases, a resistance in series with the gas sensor for establishing a reference voltage, a circuit interconnecting the resistance with a linearizing circuit including the non-inverting inputs of a plurality of voltage comparators and with the inverting input of a fault detecting comparator, an adjustable resistance of a magnitude substantially equal to the response of the sensor at its maximum value, a thermistor in parallel with a fixed resistance and in series with the adjustable resistance and with a voltage divider including a plurality of fixed resistors respectively connected with the inverting inputs of the plurality of voltage comparators together with a light emitting diode in series with the output of each voltage comparator, each light emitting diode indicating a concentration of an ambient reducing gas in terms of parts per million, and the non-inverting input of the fault detecting comparator is connected with a reference voltage to indicate an open circuit condition.
REFERENCES:
patent: 4028057 (1977-06-01), Nelson
patent: 4235096 (1980-11-01), Yasuda et al.
patent: 4258563 (1981-03-01), Yasuda et al.
Hofsass Jeffery A.
Orsino Joseph A.
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