Azbil Corporation

Kouichi Mamada

Osamu Momose

Yoshio Yamazaki

Hiroyuki Inagaki

Takumi Yamashita

A preamplifier substrate on which a preamplifier is mounted, the preamplifier being configured to amplify electromotive forces detected by a pair of surface electrodes, is disposed outside a flux region where a magnetic flux is produced, and the preamplifier substrate extends in a direction intersecting a measuring tube.

Capacitive electromagnetic flowmeter

A first connection line includes a first tube-side wiring pattern formed on an outer periphery of a measuring tube and connected at one end thereof to a first surface electrode, a first substrate-side wiring pattern formed on a preamplifier substrate and connected at one end thereof to a preamplifier, and a first jumper wire connecting the other end of the first tube-side wiring pattern to the other end of the first substrate-side wiring pattern; and a second connection line includes a second tube-side wiring pattern formed on the outer periphery of the measuring tube and connected at one end thereof to a second surface electrode, a second substrate-side wiring pattern formed on the preamplifier substrate and connected at one end thereof to the preamplifier, and a second jumper wire connecting the other end of the second tube-side wiring pattern to the other end of the second substrate-side wiring pattern.

A voltage switching circuit applies a high excitation voltage to an excitation switching circuit during a period from an excitation period starting point to a rise point in an excitation period, and applies a low excitation voltage lower than the high excitation voltage to the excitation switching circuit during a period from the rise point to an excitation period ending point in the excitation period. A constant current circuit makes the current of the low excitation voltage to be input from a power supply circuit to the voltage switching circuit constant.

Growing community of inventors

Chiyoda-ku, Japan

Kouichi Mamada