Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-11-09
1979-12-04
Swisher, S. Clement
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73361, 136222, 136233, 432 32, G01K 714
Patent
active
041765540
ABSTRACT:
The invention provides an array of spaced thermocouples inserted into the kiln as a unit to provide the temperature profile of the kiln on a continuous basis. The output signals from the thermocouples are multiplexed and displayed on a CRT device. A horizontal line across the face of the CRT screen provides a temperature reference for the profile when a digital thermometer is driven with the horizontal line generating voltage. To reproduce a desired temperature profile, the invention provides a temperature profile synthesizer comprising a resistor-ladder network and a voltage source for simulating the small voltages developed by the temperature monitoring thermocouples in the array. By displaying the synthesized temperature profile on the CRT at the same time that the actual measured temperature profile is being displayed, the kiln can be more easily controlled to provide the desired synthesized profile. By packaging these ladder networks on an encapsulated circuit card, the circuit package represents a permanent record of a particular desired temperature profile. A control system is provided wherein a kiln is automatically controlled to stabilize at a certain desired temperature profile as defined by the resistance ladder network synthesizer. As each monitoring thermocouple is sequentially read, its value is compared with the reference for that point generated by the synthesizer. The relative value of the two signals determine whether a corresponding heating element in the kiln is turned on or off.
REFERENCES:
patent: 2205182 (1940-06-01), Whitten
patent: 2474192 (1949-06-01), Schlesman
patent: 2780097 (1957-02-01), McKinlay
patent: 2924974 (1960-02-01), Dalglish
patent: 3120758 (1964-02-01), Craddock et al.
patent: 3495925 (1969-08-01), Goosey et al.
patent: 3867204 (1975-02-01), Schley
patent: 4075036 (1978-02-01), Lysikov
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