Abstract: A method for stirring a liquid, comprising: sucking a part of a liquid from a liquid-containing container which opens at the top thereof; and discharging the sucked liquid into the container at a discharging position which is horizontally different from a sucking position where the liquid has been sucked, and an apparatus used for the method.

Abstract: A method for stirring a liquid, comprising: sucking a part of a liquid from a liquid-containing container which opens at the top thereof; and discharging the sucked liquid into the container at a discharging position which is horizontally different from a sucking position where the liquid has been sucked, and an apparatus used for the method.

Abstract: In an electromagnetic flow meter converter comprising a deviation amplifier for amplifying the deviation between a feedback signal and an input signal from a flow rate detector, and a converter circuit for converting the amplified output of the deviation amplifier into a frequency signal, the improvement comprising a frequency divider for frequency dividing the frequency signal, a digital setting unit for setting the frequency dividing factor of the frequency divider, and a multiplier for multiplying the output of the frequency divider by a comparison voltage which is proportional to the current applied to the coil of the flow rate detector to provide the feedback signal, whereby the span is set digitally and whereby the compatibility between the converter and the flow rate detector is obtained by setting the product of the meter constant of the flow rate detector and a predetermined maximum flow velocity.

Abstract: An electromagnetic flowmeter using an exciting current of a rectangular wave form supplied to an exciting coil for excitation, wherein a DC voltage produced by rectifying a frequency power source, is applied by way of a voltage regulating circuit to an exciting circuit, and a switching device is connected in series between the exciting circuit and the voltage regulating circuit and is controlled by a DC reference voltage determining the level of the exciting voltage and a timing signal determining the switching timing for the exciting current. The invention enables accurate and rapid control of the waveform of the exciting current, reduces costs, and can be used for different voltages without any substantial change of circuitry.