Patent ID: 11940408
Assignee: YOKOGAWA ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. A measuring device comprising:
a first electrode immersed in sample water stored in a measuring tank;
a second electrode immersed in the sample water;
a controller that causes a power source to flow a current through the sample water between the first electrode and the second electrode;
a slip ring disposed between the first electrode and the power source;
a brush disposed to contact the slip ring;
a converter that converts the current into an analog signal;
a first AD converter that during a measuring mode in which a concentration of a measurement target in the sample water is calculated, samples the analog signal with a first sampling period and converts the analog signal into a first digital signal; and
a second AD converter that during the measuring mode, samples the analog signal with a second sampling period longer than the first sampling period and converts the analog signal into a second digital signal, wherein
the controller during the measuring mode:
detects, based on the first digital signal, that one or more changes in the analog signal are equal to or greater than a predetermined value, wherein the one or more changes in the analog signal are each caused by a change in contact between the slip ring and the brush; and
calculates, based on the second digital signal, the concentration,

the measuring device further comprises a motor that rotates the first electrode at a rotational velocity that is changed by the controller,
the controller operates in a standby mode where the concentration is not calculated, and
when the controller operates in the standby mode, the controller controls the motor such that a first absolute value of the rotational velocity when operating in the standby mode is larger than zero and smaller than a second absolute value of the rotational velocity when operating in the measuring mode.