In the industrial sector, water needs are very important, one of which is as bait
water on a steam boiler. In this sector, water has various functions including to
produce steam as a turbine player in the generation of electrical energy. To
maintain the performance and durability of the steam boiler and piping system,
then the condition of this water must meet the requirements, if not met can cause
problems such as the occurrence of crust, corrosion, and foam. Several parameters
that are important to boiler feed water include pH, conductivity, hardness, silica
content, and phosphate content. water in real time, then an internet of things
system is made for real-time monitoring of water quality based on the NodeMcu
ESP 32 microcontroller, the results of reading the data are displayed on the oled
ssd 1306 0.96" screen and sent to the firebase cloud database which is integrated
via the internet network then can be viewed through an android application that is
accessed via a smartphone remotely. The results of the tests carried out are by
comparing the results of measuring pH values, conductivity, and temperature with
standardized Kurita brand laboratory measuring instruments. The highest average
error percentage when measuring the conductivity/TDS of softener water is
25.04%