Lots of things such as dissolved oxygen, analyzer, communication, measurements, and oxygen measurements are presented in the datasheet. The datasheet contains information about analyzers, calibration, sensor, dissolved oxygen measurements, and sensor response.
Inside the datasheet you can learn information around measurement results, transmitter, troubleshooting assistance, dissolved oxygen sensor, and oxygen sensor. These are taken from this datasheet:
The Model 499ADO sensor is intended for the continuous determination of dissolved oxygen between 0-20 ppm. The primary application is aeration basins in municipal and industrial wastewater treatment plants. The Model 499ADO is a membrane-covered amperometric sensor. The sensor consists of a gas-permeable membrane stretched tightly over a gold cathode. A silver anode and an electrolyte solution complete the internal circuit. During operation, oxygen diffuses from the sample through the membrane to the cathode. A polarizing voltage applied to the cathode reduces the oxygen to hydroxide.
Furthermore, the datasheet tells the reader more such as barometric pressure, applications, oxygen, and digital communication protocols.