INSTRUMENTATION SCIENTIFIQUE DE LABORATOIRE Patent applications |
Patent application number | Title | Published |
20120073598 | METHOD FOR CLEANING THE U-TUBE OF THE MEASUREMENT CELL OF A DENSIMETER - A method for cleaning the U-tube of the measurement cell of a densimeter, the measurement cell including an isothermic enclosure defining a measurement chamber closed by a stopper surrounded by a resilient seal, a U-tube extending inside the measurement chamber for containing a sample, the U-tube secured to the stopper at a base of the U-tube which includes free ends projecting outwardly from the measurement chamber to permit injection of the sample via an injection opening and evacuation of the sample via an evacuation opening, and means for causing the U-tube to vibrate. The method comprises, following a step of analyzing a sample, injecting a rinsing solvent into the injection opening of the U-tube, and subjecting the stopper to ultrasonic waves. | 03-29-2012 |
20120073389 | METHOD FOR INJECTING A SAMPLE BEING ANALYZED INTO THE INJECTION TUBE OF A MEASUREMENT CELL, IN PARTICULAR OF A DENSIMETER - A method for injecting a sample being analyzed into the injection tube of a measurement cell which includes an injection opening and a punch. The sample is introduced into a syringe including a plunger, and the syringe is closed by an expendable cap having a male end closed by a strikable closure. The syringe is secured to the support of an injection station aligned with the injection opening, and a pusher displaces the syringe by vertical translation from an upper position to a lower position with the punch perforating the closure of the cap to inject the sample from the syringe into the injection tube. | 03-29-2012 |
20120073368 | METHOD FOR THE ACCURATE MEASUREMENT OF THE DENSITY OF A SAMPLE - A method for the accurate measurement of the density of a sample using a densimeter equipped with a measurement cell, a sample-containing U-tube including a ferromagnetic member, an insulated conductive reading plate maintained at a different potential relative to the U-tube, and an electromagnetic excitation winding. The method includes the steps of transmitting a synchronised rectangular excitation signal continuously to the U-tube to cause the U-tube to vibrate at resonance frequency, the vibration being represented by a sinusoidal resonance signal; determining the resonance frequency from the variations in the voltage at the terminals of the capacitor and deducing an approximate value of the density of the sample; controlling the pulse width of the rectangular excitation signal to maintain a predefined constant amplitude of the resonance signal; and deducing a correction factor dependent on the viscosity of the sample. | 03-29-2012 |