High Sensitivity TOC Automatic Analyzer (for ultrapure water)



The TOC-780 is a high-sensitivity, automatic TOC analyzer which quickly and accurately measures the total organic carbon content of pure water, and water from rivers and other sources, in either online or offline mode.
This system is designed to achieve superior operability and save space, based on the previous TOC-700 Series which achieved high-speed response (90% response within five minutes) by employing a continuous measurement system developed using Toray Engineering’s proprietary technology.


  • TOC absolute value can be measured using system blank and dilution water correction for calibration liquid.
  • Auto zero and an automatic diagnosis function enable stable measurement over the long-term.
  • The system employs the wet UV oxidation/CO2 detection system for continuous measurement and high-speed response.
  • Applicable to a wide range of samples, from pure water to river water.


  • Water quality management for pure water used in semiconductor manufacturing
  • Water supply, drug manufacture, food, and chemical engineering water quality management
  • Steam drain and other process management
  • Other general pure water quality management

Principle of Measurement

After inorganic carbon is removed from sample water using an IC scrubber, organic carbon is oxidized and converted to carbon dioxide by adding an oxidant and irradiating with powerful UV rays in a UV reactor. Concentration of the converted carbon dioxide is measured with an infrared analyzer, and the TOC value is obtained from the calibration curve for carbon dioxide and TOC stored beforehand in the signal processing unit.

TOC-780 specifications

Measurement range TOC-780H :
Dilution function
Stream switching function
Measurement cycle Automatic continuous measurement
Measurement method Inorganic carbon removal: Automatic continuous acidic aeration method
Total carbon measurement: Automatic continuous low-temperature wet UV oxidation - infrared analysis method
Calibration method Span calibration: Manual
Zero calibration: Manual and automatic calibration
Conversion function
Range setting Manual setting, remote setting and automatic switching
Type Standalone console, with casters
Dimensions 602W×400D×1300Hmm
Weight Approx. 140kg
Standard liquid Potassium hydrogen phthalate aqueous solution
Repeatability Within ±2% of full scale
Zero stability Within ±2% of full scale/day
Span stability Within ±2% of full scale/day
Ambient temperature change Within ±2% of full scale/5°C
Measurement value output External output: DC 4-20 mA
Range ID signal no-voltage contact: AC 125 V, 2 A
Error alarm indication LED display, Closed contact output in case of error (AC 125 V, 2 A)
Alarms Upper/Lower limits for measured value

Out of carrier gas (Option)
No sample (Option)
Out of reagent (Option)
Sample conditions Online measurement: 0.02–0.3 MPa, 30 ml/min or higher
Offline measurement: Normal pressure, 500–1000 ml/3 times
Reagents/Utilities Test reagent:
Phosphoric acid solution 20–25 l/month
Sodium persulfate solution 20–25 l/month *2
Nitrogen gas, Pressure 0.2–0.7 MPa
Consumption 60–78 Nm3/month
Power AC100V±10V 50/60Hz Approx. 500VA
Set up conditions Indoor
0–40°C during operation (Temperature gradient 10°C/hour or less)
45–85%RH (No condensation)

Specifications are subject to change due to product improvements.
*1 Available as an option.
*2 Used only with TOC-780H.


  • Tokyo office: +81-3-3241-8461

    Shiga office: +81-77-544-6224

Technological Field
Technology >> Measurement & analysis > Water Quality Analyzers
Industry Sector
Industry sector >> Home appliances & electronics equipment > Home Appliances & Electronic Equipment Sensors