Temperature control circuitry

Details Temperature control circuitry Temperature control circuitry

1978-01-16

1980-12-09

Reynolds, Bruce A.

Electric heating

Heating devices

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

219497, 219501, 219488, 219514, 236 15BB, 236DIG15, H05B 102

Patent

active

042386721

ABSTRACT:
A temperature control circuit particularly for use with a graphite tube atomizer of an atomic absorption spectrometer provides rapid temperature rise and a leveling at a constant predetermined temperature. A.C. power applied through a transformer to electrodes on the ends of the graphite tube rapidly heats the tube and the visible radiation thus produced is measured by a photocell, the output of which is amplified to control a relay in the graphite tube power circuit. When the desired tube temperature is approached, the photocell output actuates the relay so that the tube power circuit will switch from the high voltage rapid heating mode to a controlled lower voltage that will automatically maintain the constant predetermined tube temperature.

REFERENCES:
patent: 1626663 (1927-05-01), Brace
patent: 2404147 (1946-07-01), Strickland, Jr.
patent: 2924695 (1960-02-01), Atkeson
patent: 3330940 (1967-07-01), Hocker
patent: 3781521 (1973-12-01), Kircher
patent: 3808402 (1974-04-01), Rea
patent: 3821516 (1974-06-01), Hayes et al.
patent: 3858141 (1974-12-01), Lackey
patent: 3869597 (1975-03-01), Strange
Temperature Controlled Heating of the Graphite Tube Atomizer in Flameless Atomic Absorption Spectrometry-Analytical Chemistry vol. 46 #8 pp. 1028-1031, Jul. 1974.

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