Abstract: An inkjet recorder includes at least one nozzle ejecting ink, at least one piezoelectric element, a power unit, and a processor. The at least one piezoelectric element deforms in response to an applied voltage and causing a change in pressure of ink to be supplied to the nozzle. The power unit supplies power for application of a driving voltage to the piezoelectric element. The processor cyclically applies the driving voltage in accordance with a predetermined driving voltage pattern to the piezoelectric element, acquires a representative value corresponding to the power supplied by the power unit in response to the application of the driving voltage, and detects an abnormal capacitance of the piezoelectric element determined based on the representative value.

Abstract: An inkjet recorder includes at least one nozzle ejecting ink, at least one piezoelectric element, a power unit, and a processor. The at least one piezoelectric element deforms in response to an applied voltage and causing a change in pressure of ink to be supplied to the nozzle. The power unit supplies power for application of a driving voltage to the piezoelectric element. The processor cyclically applies the driving voltage in accordance with a predetermined driving voltage pattern to the piezoelectric element, acquires a representative value corresponding to the power supplied by the power unit in response to the application of the driving voltage, and detects an abnormal capacitance of the piezoelectric element determined based on the representative value.

Abstract: According to the present invention, the temperature of a head unit is more reliably controlled. A control device for inkjet head, which controls the temperature of a head unit in an inkjet head that is provided with the head unit for ejecting an ink and a heating unit for heating the ink within the head unit. This control device for inkjet head is provided with: a first control unit which controls the action of the heating unit so that the temperature of the head unit is at a first temperature; and a second control unit which stops the action of the heating unit in cases where the temperature of the head unit reaches a second temperature or higher, said second temperature being higher than the first temperature.

Abstract: A measuring apparatus for measuring the number and size of impurities such as dust and bacteria in super-pure water includes a sealed container; a sample supply line which sealingly interconnects a source of super-pure water with the sealed container and supplies a sample mixture of super-pure water and electrolyte to the sealed container; an overflow pipe which sealingly connects with the side of the sealed container; a negative electrode which extends into the sample mixture in the sealed container; a hollow sensor which extends into the sample mixture in the sealed container, the hollow sensor containing a positive electrode surrounded by electrolyte and having a small hole at its lower end; and a detecting circuit connected to said negative and positive electrodes for supplying a certain DC current therebetween and detecting voltage pulses caused by impurities passing through the small hole into the hollow sensor.