UV Persulphuric Acid Oxidation-type Online Total Organic Carbon (TOC) Analyzer, HATA-4000, is a measuring equipment that has automated the “Continuous Automatic TOC Measuring Method” of the Standard Water Pollutant Testing Method. HATA-4000 has minimized quantitative errors of sample analysis by using peristaltic metering pump and sample loop system, and it is measuring equipment that has been developed to accurately and easily measure TOC by improving the precision through the sensor measurement value correction function according to the gas flow rate. Through the application of UV persulphuric acid oxidation method, it has wide range of applications from rivers to wastewater.