Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1977-05-31
1980-01-29
Reynolds, Bruce A.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219413, 219400, 236 15BR, 126 21A, 219510, 73 231, 219498, H05B 102
Patent
active
041862953
ABSTRACT:
In a gas chromatography system of the type including an oven for the GC column, and an electric heater for controllably heating the oven; an improved system is disclosed for controllably opening and closing the oven door to enable a fully controlled heat leak, thereby to stabilize the oven temperature at a desired set point. A signal indicative by first or second conditions of an oven temperature above or below the set point is generated. A heater power control responds to one of the signal conditions by effecting heating of the oven. Bi-directional door motor and actuator means are provided for opening and closing the oven door over a prescribed operating range, and these means are enabled to operate for a predetermined period upon the signal in its first or second condition departing from preset threshold values for a predetermined period whereby closing or opening of the oven door is effected in incremental steps. The door operating range is preferably sub-divided, as to define a close-in range proximate to closing, wherein control is effected in reduced sized steps. In consequence, the door may be rapidly brought to the close-in range, whereat the finer control may more effectively bring about the desired stable condition.
REFERENCES:
patent: 1607054 (1926-11-01), Chadborn
patent: 1952350 (1934-03-01), Armstrong
patent: 2698717 (1955-01-01), Sisco
patent: 3305000 (1967-02-01), Bullen et al.
patent: 3947237 (1976-03-01), Leisenberg
patent: 4072846 (1978-02-01), Christer et al.
Computer Control of Gas Chromatographic System-Biler et al.-Hewlett Packard Co.
Cole Stanley Z.
Fisher Gerald M.
Morrissey John J.
Paschall M. H.
Reynolds Bruce A.
LandOfFree
Control system for a chromatography apparatus oven door does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system for a chromatography apparatus oven door, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for a chromatography apparatus oven door will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-882544