| 摘要 |
A gas (oxygen) sensor measures the partial pressure of a gas in a mixed fluid (water and absorbed gases) and provides an output signal proportional to the partial pressure of the gas to which the sensor is exposed. An electronic amplifier receives this signal and drives a meter giving visual indication of the signal from the sensor. Prior to taking a reading with the device, a series of compensation steps are followed which change the meter indication with respect to the sensor output in order to compensate for changes in solubility of the gas in the fluid due to temperature differences, barometric pressure changes (with changes in altitude) and changes in the salinity of the fluid. When the reading is taken, the meter indicates directly the amount of gas (oxygen) present in the fluid in parts per million (PPM).
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