摘要：With population growth, along with some other factors, rivers, streams and areas of wetlands have become polluted. Among the contaminants can be found, bacteria, protozoan and fungal pathogens, toxins produced by algae or decaying animal or waste (slurry), and nitrates. In addition, all sorts of chemicals that are harmful to life, due to industrial waste, can occur, such as phenols, chlorinated compounds used in the paper industry, hydrocarbons present in solvents and paints and many others. Anyway can also be found heavy metals dissolved in the water forming ions such as chromium (VI), which are highly carcinogenic compounds and lead and mercury, which can cause different kinds of illnessesWater is considered to be of good quality when it has less than athousand fecal coliforms and less than ten pathogenic microorganisms per liter which is made by means of bacteriological analysis. The water analysis laboratory uses a closed equipment, electronic oven , able to stabilize at a desired value the air temperature , allowing the simulation of a suitable environment for the cultivation of relevant bacteria to the process of analysis, which require a stabilized temperature at 35 ° C ± 0.5 ° C accurately, with three touch buttons for plus and minus adjustment. Central theme of this work was to build an automated project to create a controlled temperature environment that contains electronic system that controls and stabilization system temperature.
