Water Quality AnalyzersHigh Sensitivity TOC Automatic Analyzer (for ultrapure water)


TOC-780 water quality analyzer


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.
The TOC-780 achieves superior usability and space savings, based on the previous TOC-700 Series which achieved high-speed response (90% response within five minutes) with continuous measurement system developed by Toray's technology.


  • TOC absolute values can be measured using system blank analysis and dilution water correction for calibration liquid.
  • The auto zero and automatic diagnosis functions enable stable measurement over the long-term.
  • The system employs a 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

Measurement principle

To calculate total organic carbon, firstly, after inorganic carbon is removed from sample water using an IC scrubber, organic carbon is efficiently oxidized and converted to carbon dioxide by adding an oxidant and irradiating with powerful UV rays in a UV reactor. secondly, concentration of the converted carbon dioxide is measured by an infrared analyzer to get the TOC calibration curve, then comparing with the carbon dioxide gas concentration, registered in advance in the data processing unit.


Type TOC-780H
Measurement range 0-1 / 0-10mg/l
Measurement cycle Automatic continuous measurement
Response time(90% response) In 5 minutes
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
Range setting Manual setting, remote setting, and automatic switching
Type Standalone cubicle panel, with casters
Dimensions 600 mm (W) × 550 mm (D) × 1,370 mm (H)
Weight Approx. 150 kg
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 DC4~20mA
Range ID signal non-voltage contact AC125V, 2A
Error alarm indication LED display, closed contact output in case of error (AC 125 V, 2 A)
Alarms Measurement value upper/lower limits
Out of carrier gas (optional)
No sample (optional)
Out of test reagent (optional)
Sample conditions Online measurement 0.02 to 0.05 MPa, 30 ml/min or higher
Offline measurement Normal pressure, 500 to 1,000 ml measurements
Test reagents/utilities Test reagent Phosphoric acid solution 5~5.5l/month
Sodium persulfate solution 5~5.5l/month
Carrier gas Nitrogen gas, Pressure 0.54±0.05MPa
Consumption 14 - 34 Nm3/month
Power AC100V±10V 50/60Hz Approx. 500VA
Installation conditions Indoors
Indoors 0 to 40°C during operation (temperature gradient of 10°C/hour or less)
45% to 85% RH (with no condensation)

Specifications are subject to change in order to make product improvements.


  • East Japan : +81-3-5962-9775

    West Japan : +81-77-544-6224