Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1996-11-21
1998-07-07
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 6156, 422 681, 422 70, 137 7, 137897, 137606, G01N 3108, B01D 1508
Patent
active
057772134
ABSTRACT:
The invention provides a preparative liquid chromatography apparatus wherein flow rate control can be effected in a wider range and with a higher degree of accuracy than where a pump is used while preventing production of air bubbles in liquid and the mixture ratio of chemicals can be controlled in a wide range and with a high degree of accuracy. The preparative liquid chromatography apparatus includes a plurality of buffer liquid tanks of the enclosed pressurizing type, a pressurization apparatus for supplying gas to apply a pneumatic pressure to the insides of the buffer liquid tanks, a plurality of electric signal to pneumatic pressure converters for adjusting pneumatic pressures of the gas to be applied actually to the buffer liquid tanks by the pressurization apparatus in response to electric signals, a plurality of flow rate detectors for detecting flow rates of liquid forced out from the buffer liquid tanks by the pneumatic pressures of the gas, and arithmetic units for comparing the flow rates detected by the flow rate detectors with preset values to produce electric signals to be outputted to the electric signal to pneumatic pressure converters.
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Akaike Kazuya
Tsukazaki Hideo
TFC Corporation
Wiggins J. David
Williams Hezron E.
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