Research and Design of Distributed IoT Water Environment Monitoring System Based on LoRa

Table 3

Node monitoring results on November 11, 2019 (cloudy weather).

Monitoring time	Water quality parameter	Standard value	Node actual value	Relative error (%)
00 : 00	Water temperature (°C)	17.25	17.22	-0.17
	pH	8.13	8.14	+0.12
	Conductivity (mS/cm)	0.35	0.32	-8.57
	Turbidity (NTU)	26.6	26.5	-0.38
08 : 00	Water temperature (°C)	17.97	17.87	-0.56
	pH	7.98	7.96	-0.25
	Conductivity (mS/cm)	0.34	0.35	+2.94
	Turbidity (NTU)	27.3	26.8	-1.83
16 : 00	Water temperature (°C)	18.01	18.06	+0.27
	pH	8.35	8.36	+0.12
	Conductivity (mS/cm)	0.33	0.34	+3.03
	Turbidity (NTU)	27.1	27.2	+0.37