Dissolved Oxygen Measurement System and Method of Calibrating Dissolved Oxygen Meter
First Claim
1. A dissolved oxygen measurement system comprising:
- a dissolved oxygen measuring device comprising a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and
a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.
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Abstract
In order to improve measurement accuracy by accurately calibrating sensitivity of a dissolved oxygen meter without impairing easiness in calibration, the present invention includes a dissolved oxygen measuring device that includes a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is substantially in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is substantially not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.
9 Citations
8 Claims
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1. A dissolved oxygen measurement system comprising:
a dissolved oxygen measuring device comprising a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and
a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.- View Dependent Claims (2, 3, 4, 5, 6)
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7. A dissolved oxygen measuring device comprising a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution,
wherein the dissolved oxygen measuring device is used together with a mode switching mechanism to perform switching between a measurement mode, in which a sensor surface of the dissolved oxygen meter is in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.
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8. A method of calibrating a dissolved oxygen meter to measure an oxygen concentration in a sample solution, the method comprising performing a span calibration using air that is saturated with water vapor.
Specification