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Water quality can change frequently over time, necessitating frequent, repeated measurements to adequately characterize variations in quality. When the time interval between repeated measurements is sufficiently small, the resulting water-quality record can be considered continuous.
A continuous water-quality monitoring system is an internal-logging, combined sensor and recording sonde that is entirely immersed and requires no external power, thus reducing its exposure to vandalism. Power is supplied by conventional batteries located in a sealed compartment, and sensor data is stored within the sonde on nonvolatile, flash-memory, recording devices. The primary advantages of the internal-logging configuration are that AC power or large batteries and shelters are not needed.
Seametrics CT2X Submersible Smart Sensor Conductivity/
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