Dry bath temperature control

Details Dry bath temperature control Dry bath temperature control

1984-05-15

1985-03-12

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

165185, 219378, 219385, 219494, 219530, 361380, 422116, H05B 306

Patent

active

045047332

ABSTRACT:
An electrically-heated dry bath wherein a metal block having receptacles for receiving test tubes or the like has resistor heaters fixed thereto and a thermistor temperature sensor therein. A control circuit is provided which connects and disconnects electrical current to and from said heaters in response to the temperature sensor. The control current is fedback such as to eliminate a factor J(S) from the overall transfer function of the circuit, J(S) being a transfer function expressing how various thermal time constants in the bath would, unless neutralized, make the effective time constant of the controlled system deviate from the ideal on-off transfer function.

REFERENCES:
patent: 2911513 (1959-11-01), MacCracken
patent: 2932718 (1960-04-01), Marsters
patent: 3141948 (1964-07-01), Young
patent: 3381113 (1968-04-01), Jacques et al.
patent: 3694356 (1971-11-01), Havill
patent: 3801278 (1974-04-01), Wagner et al.
patent: 3902043 (1975-08-01), Rogan
patent: 3986082 (1976-10-01), Land
patent: 3989927 (1976-11-01), Erb
patent: 4107513 (1978-08-01), Ashford
patent: 4342903 (1982-08-01), Hoogstoel

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