Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer
Reexamination Certificate
2007-05-08
2007-05-08
Williams, Hezron (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Gas or liquid analyzer
C073S001620, C073S001880, C073S054050, C073S054090
Reexamination Certificate
active
11090371
ABSTRACT:
A thermally controlled stage is connected within one arm of a bridge of a capillary bridge viscometer so that the bridge can be balanced in situ to provide accurate measurement signals. The thermally controlled stage includes a tuning capillary tubing portion that is wrapped around a thermally conductive core. A resistance heater or a Peltier thermoelectric device is located in close proximity to the capillary tubing portion. The heater or Peltier device and the capillary tubing portion are located within a thermally insulated housing. The heater or Peltier device varies the temperature of the capillary tubing portion to cause a corresponding change in the flow impedance of the tuning capillary tubing portion of the arm of the bridge in which the thermally controlled stage is connected. The temperature of the tuning capillary tubing portion is monitored and adjusted until any pressure differential across the bridge is eliminated, whereby to trim in the balance of the bridge.
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Waters et al., “Characterization of Hyaluronic Acid with On-Line Differential Viscometry, Multiangle Light Scattering, and Differential Refractometry”, LCGC, Mar. 2005, pp. 1-5.
Fischer Morland C.
Rogers David A.
Williams Hezron
Wyatt Technology Corporation
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