Azbil Corporation

A wireless opening meter includes measurement portions that measures an opening, a pneumatic pressure supplied to an operation device, and a temperature at an outlet side of the control valve; a failure diagnosis portion that calculates an index of a change leading to a failure of the valve based on a measurement value, and executes failure diagnosis of the valve based on the index; a wireless communication portion that wirelessly transmits the index and a result of the failure diagnosis to a valve maintenance support device; and an adjustment portion that compares the index with a predetermined index determination threshold, and in response to determining that a progression degree towards a failure of the valve is small, perform thinning processing of an operation time of the wireless opening meter by extending an operation cycle of the wireless opening meter to be longer than an initial value.

An excitation circuit of an electromagnetic flowmeter includes: an excitation switching circuit 1 that switches the polarity of an excitation current supplied to an excitation coil L 1 ; diodes D 1 and D 2 with cathodes connected to a voltage input terminal of the excitation switching circuit 1 ; a DC/DC converter 2 that supplies a low voltage VexL; a constant current circuit 3 with an input terminal connected to an output terminal of the DC/DC converter 2 , and an output terminal connected to an anode of the diode D 1 ; and a switch SW 5 with a first contact terminal connected to a high voltage VexH, and a second contact terminal connected to an anode of the diode D 2 , which turns on during a period from an excitation period start point to a rising point of the excitation current within the excitation period, and turns off during a period from the rising point to an excitation period end point. A feedback voltage to the DC/DC converter 2 is set to an anode side voltage of the diode D 1.

A position measuring device includes: a first sensor, measuring acceleration or angular velocity of a valve stem of an ON-OFF valve; a position information generation part, integrating the acceleration or angular velocity measured by the first sensor and converting the acceleration or angular velocity into position information; a second sensor, detecting mechanical vibration generated in association with opening and closing of the ON-OFF valve; a reference position specification part, pre-storing, as reference position information, position information when vibration is detected by the second sensor; and a calibration processing part, when vibration is detected by the second sensor, executing calibration processing to reduce position measurement errors based on the position information obtained by the position information generation part and the reference position information.

The disclosure makes it possible to uniformly and easily perform on-site diagnostic work for an electromagnetic flowmeter. A storage part 131 stores explanation information about the connection between a measurement circuit 104 and a measurement point for each of multiple measurement points (jumper terminals 105 a, 105 b, 105 c , and 105 d ) in measurement. An acquisition function part 134 acquires explanation information explaining the connection between the measurement circuit 104 and the measurement point from the storage part 131 for each of multiple measurement points, in response to switching to an inspection mode. A presentation function part 135 presents the explanation information acquired by the acquisition function part 134.

A wireless opening meter includes measurement portions that measures an opening, a pneumatic pressure supplied to an operation device, and a temperature at an outlet side of the control valve; a failure diagnosis portion that calculates an index of a change leading to a failure of the valve based on a measurement value, and executes failure diagnosis of the valve based on the index; a wireless communication portion that wirelessly transmits the index and a result of the failure diagnosis to a valve maintenance support device; and an adjustment portion that compares the index with a predetermined index determination threshold, and in response to determining that a progression degree towards a failure of the valve is small, perform thinning processing of an operation time of the wireless opening meter by extending an operation cycle of the wireless opening meter to be longer than an initial value.

An improved diaphragm vacuum gauge including a sensor chip that includes a first electrode provided on a base and a second electrode provided on a diaphragm so as to face the first electrode, the diaphragm and the base being disposed with a gap therebetween, and in which a distance between the first electrode and the second electrode changes in accordance with displacement of the diaphragm caused by pressure of a measurement target medium. The diaphragm vacuum gauge further includes an operational amplifier that converts a current output from the first electrode to a voltage and amplifies the voltage, and a coaxial cable that connects the first electrode and the operational amplifier with each other. Further, the first electrode is connected to a virtual ground of the operational amplifier by a core wire of the coaxial cable.

An improved diaphragm vacuum gauge includes a pressure receiving unit having an electrical property that changes in accordance with displacement of a diaphragm caused by pressure of a measurement target medium; a heater that heats the pressure receiving unit; a temperature sensor that measures a temperature of the pressure receiving unit; a pressure measurement unit that converts a change in the electrical property of the pressure receiving unit to a pressure measurement value; a storage unit that stores a plurality of heating temperature settings; a heating temperature setting unit that selects one heating temperature setting from among the plurality of heating temperature settings in accordance with a digital input signal that is externally input; and a controller that controls power supply to the heater based on the temperature measured by the temperature sensor and the heating temperature setting selected by the heating temperature setting unit.

A diaphragm vacuum gauge includes: a pressure receiving unit having an electrical property that changes in accordance with displacement of a diaphragm caused by pressure of a measurement target medium; a heater that heats the pressure receiving unit; a temperature sensor that measures a temperature of the pressure receiving unit; a pressure measurement unit that converts a change in the electrical property of the pressure receiving unit to a pressure measurement value; a storage unit that stores a plurality of heating temperature settings; a heating temperature setting unit that selects one heating temperature setting from among the plurality of heating temperature settings in accordance with a digital input signal that is externally input; and a control unit that controls power supply to the heater on the basis of the temperature measured by the temperature sensor and the heating temperature setting selected by the heating temperature setting unit.

A mass flow controller includes a pipe through which fluid flows, a laminar element generating differential pressure between the fluid at an upstream side and the fluid at a downstream side, a differential pressure sensor measuring differential pressure between first absolute pressure of the fluid at the upstream side of the laminar element and second absolute pressure of the fluid at the downstream side thereof, an absolute pressure sensor measuring the second absolute pressure, a pressure controller controlling a valve opening of a first valve so that the second absolute pressure has a constant value, a flow rate calculator calculating a flow rate of the fluid based on the differential pressure and the second absolute pressure, and a flow rate controller controlling a valve opening of a second valve so that the value of the flow rate is equal to a flow rate setting value.

A liquid-contact portion exposed into a measurement tube is provided, and a main body portion formed by covering a base material with a conductor and a terminal portion electrically connected to the conductor are provided. The base material includes first to fifth end surfaces extending in a direction crossing a radial direction of the measurement tube and first to fourth side surfaces extending in the radial direction from end edges of the end surfaces. Grooves each connected at one end thereof to the end surface and at the other end thereof to the side surface are formed on an outer boundary portion, which is a boundary portion between the end surface and the side surface and projects outward of the main body portion.