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Even though applying preventive planning, these quality sensors could be affected by several problems, such as the ones listed in Table 1. Thus, a corrective planning is always required to solve these unexpected problems affecting the sensors' reliability.

Table 1

Main factors affecting the information gathered from water quality sensors

CauseConsequence
Communication problem Data gap 
Loss of sensitivity Flat signal or slow drift down 
Electronic malfunction Noise and peaks in the signal 
Miscalibration of the sensor Offsets affecting the real value 
CauseConsequence
Communication problem Data gap 
Loss of sensitivity Flat signal or slow drift down 
Electronic malfunction Noise and peaks in the signal 
Miscalibration of the sensor Offsets affecting the real value 

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