Abstract: A pressure detector includes: a case provided with a hole portion; support pillar members standing on the bottom surface of the case and each including a tapered portion at an end of each of the support pillar members; a circuit board including a sensor having a detection aperture, and mounting holes into which the respective tapered portions are insertable; and a packing provided with a through hole. The case and the circuit board are fixed by a cured resin while the hole portion is connected to the detection aperture via the through hole by inserting the tapered portion of each of the support pillar members into the mounting hole of the circuit board and by sandwiching the packing between the bottom surface of the case and the sensor.

Abstract: A measurement apparatus 100 includes a measurement unit 10 to propagate an ultrasonic wave in a medium 98 that flows inside a pipe 99 and to receive the ultrasonic wave, a difference calculating section 23a to calculate a difference signal obtained by taking a difference in waveforms of reception signals at least between two received ultrasonic waves, and an identifying section 23d to identify a reception timing of transmission of an ultrasonic wave based on a target signal component included in the difference signal. According to the identification of the reception timing based on the target signal component included in the difference signal, a flow velocity of the medium 98 can be measured precisely by using the reception timing.

Abstract: A pressure detector includes: a case provided with a hole portion; support pillar members standing on the bottom surface of the case and each including a tapered portion at an end of each of the support pillar members; a circuit board including a sensor having a detection aperture, and mounting holes into which the respective tapered portions are insertable; and a packing provided with a through hole. The case and the circuit board are fixed by a cured resin while the hole portion is connected to the detection aperture via the through hole by inserting the tapered portion of each of the support pillar members into the mounting hole of the circuit board and by sandwiching the packing between the bottom surface of the case and the sensor.