JPS6370073U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the present invention, Fig. 2 is a schematic diagram showing an isotachophoresis analyzer to which the present invention is applied, Fig. 3 is a flowchart showing the operation of the present invention, and Fig. 4 is a valve. It is a sectional view showing an example. 2...Terminal electrode tank, 4...Leading electrode tank, 6...Migration tube, 8...Sample injection section, 10...Detector, 22...Valve, 60...Migration current monitor section, 62
...Calculation/control unit, 64... Constant voltage setting means, 66...
Voltage applying means, 68... Monitoring means, 70... Differentiating means, 72... Threshold setting means, 74... Comparing means,
76...Local maximum current storage means, 78...Maximum value detection means, 80...Valve control means, 82...Valve position storage means.

Claims (1)

[Scope of utility model registration request] In an isokinetic electrophoresis analyzer in which a sample injection part and a detector are arranged in order in a migration tube between a terminal electrode tank and a leading electrode tank, and a valve is provided in the migration tube between the detector and the leading electrode tank. , a migration current monitor unit is provided for monitoring migration current from a high voltage power source that applies migration voltage to the terminal electrode tank and the leading electrode tank, and a migration current monitor unit monitors the migration current from a high voltage power source that applies migration voltage to the terminal electrode tank and the leading electrode tank, A calculation/control unit is provided for positioning the valve and the migration tube, and the calculation/control unit includes a constant voltage setting means for setting the applied voltage of the high voltage power supply, and a constant voltage setting means for setting the applied voltage of the high voltage power supply. a voltage applying means for starting voltage application to the high voltage power supply; a monitoring means for receiving a voltage application start signal from the voltage applying means, inputting a monitor current from the electrophoretic current monitor section and converting it into a digital signal; a differentiating means for differentiating a monitor current from the means; a threshold setting means for setting a threshold value of the monitor current; and a threshold value set by the threshold setting means and a monitor current from the monitor means. a comparison means for making a comparison; a maximum current storage means for storing a local maximum value of the monitored current based on the output of the differentiating means when the current monitored by the comparison means becomes larger than a threshold current; a maximum value detection means for detecting the maximum value of the local maximum values, and after receiving a voltage application start signal from the voltage application means, sends a signal of a predetermined drive amount of the valve to the valve drive unit at regular intervals. In addition, valve control means fixes a signal to be sent to the valve driving section based on a signal from the valve position storage means described later, and a valve control means that stores the valve position at the time of the maximum value of the monitor current and receives a signal from the maximum value detection means. and valve position storage means for sending the valve position at which the monitored current is at its maximum value to the valve control means.