Liquid purification or separation – Processes – Chromatography
Patent
1990-05-04
1992-08-04
Dawson, Robert A.
Liquid purification or separation
Processes
Chromatography
210101, 2101982, B01D 1508
Patent
active
051356589
ABSTRACT:
A controller (30) based chromatography system (2) especially designed for flexibility of operation with ease of use and an icon based control panel (32), has a number of function panels (34), each having a function key (36), one or more indicator indicia (40) in the form of icons, letters or numbers, and associated indicator lights (38). A switching valve (4) is used to provide a mixture of two or more solvents (6, 8) to a peristaltic pump (12). The cyclic nature of the pump and mixer can create a resonant condition resulting in poor quality information from the UV monitor (20). The system minimizes this by the judicious selection of the total cycle time T for the switching valve. This can be done using a random number manipulated in a manner to come up with each time T. Alternatively, an irrational number is combined with the pulsation frequency of the pump to create each time T. A valve driver circuit (170) used with a valve (172) of the type which requires a higher voltage switching signal (174) and lower voltage sustaining signal (176). The system permits the user to use three different nominal flow rate calibrations for peristaltic pumps using tubing having three different diameters (82, 84, 86). In addition to the precalibrated settings, the system can be user calibrated when desired.
REFERENCES:
patent: 3446057 (1969-05-01), Bakalyar
patent: 4427298 (1984-01-01), Fahy et al.
patent: 4595495 (1986-06-01), Yotam
patent: 4595496 (1986-06-01), Carson
patent: 4767279 (1988-08-01), Dourdeville et al.
patent: 4964985 (1990-10-01), Goulder
Pharmacia Biotechnology Products Catalogue 85, 1985, pp. 1-51.
Feinstein Paul
Fitchman Mark I.
Gordon-Gilmore Randy
Lee Kim W.
Bio-Rad Laboratories, Inc.
Dawson Robert A.
Kim Sun Uk
LandOfFree
Method for reducing detector noise in a chromatography system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for reducing detector noise in a chromatography system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reducing detector noise in a chromatography system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-776340