Method and apparatus for controlling an analytical furnace

Details Method and apparatus for controlling an analytical furnace Method and apparatus for controlling an analytical furnace

1980-09-24

1983-09-13

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219492, 219494, 432156, 73 25, 323319, 373136, 373118, H05B 102

Patent

active

044044615

ABSTRACT:
A control system for applying operating power to an analytical furnace includes a first circuit providing output signals consisting of a series of binary bits in a predetermined pattern with each bit corresponding to a unit of power to be applied to an analytical furnace according to the pattern of bits and a control circuit coupled to the first circuit and including output terminals for coupling the control circuit to an analytical furnace. The control circuit responds to the binary bits to provide pulses of operating power to the output terminals in a sequence corresponding to and controlled by the binary bits. The pattern of bits provides stepwise increasing temperature levels for the analytical furnace in a very predictable and controlled fashion such that samples combusted by the furnace will emit specimen gases associated with different compounds containing the specimen gas at different temperature levels.

REFERENCES:
patent: 3569602 (1971-03-01), Norem
patent: 3855452 (1974-12-01), Flaza et al.
patent: 3901437 (1975-08-01), Haskins
patent: 4229412 (1980-10-01), Orths et al.
patent: 4233498 (1980-11-01), Payne et al.
Analytical Chemistry vol. 46 #8 Jul. 1974, pp. 1028-1031 "Temperature Controlled Heating of Graphite Tube".

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