| 摘要 |
Apparatus for indicating the concentration of a particular constituent in a fluid including a sensing device for sensing the concentration of a particular constituent in a fluid and for providing a response; and an electronic device including a differentiating circuit for differentiating an electrical input signal which is proportional to the sensing response for providing a substantially constant output signal which is a measure of the sensing response differentiated with respect to time, which output signal is an indication of the concentration of the constituent in the fluid. The sensing device is operated during a sampling period in which the reaction of such constituent to the sensing device is linear.
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