| 摘要 |
1,119,863. Viscosimeters; measuring liquid level electrically. TECHNICON INSTRUMENTS CORP. Jan. 27, 1966 [Feb. 23, 1965], No.3643/66. Headings G1N and G1S. The viscosity of successive samples of blood is measured by determining the pressure needed to pump the samples at a constant velocity through an aperture. The samples are drawn in succession from a rotary sampler 10 by a peristaltic pump 12 and forced via pipe 14 through a constriction 38. Depending upon the viscosity of the particular sample, some blood will rise up tube 44 thereby displacing water which has been trapped between the upper part of tube 44, a capacitance transducer 90, and a tube 110 which contains air and is sealed at the upper end. The displaced water rises between a pair of plastic coated metal plates 92, 94 of the transducer 90, and the change of capacitance is measured in an undisclosed manner by a bridge circuit recorded as a measure of viscosity. Between successive blood samples, a programmer 116 causes solenoid valves 58, 84 to rotate from the positions shown so that water can drain from the transducer 90, and water can be pumped by a line 16 from a source 32 to flush the tube 44, and water is also supplied through pipe 14 instead of blood. |
