Automatic Total Oxygen Demand Analyzer TOD-810C

The TOD-810 is an automatic TOD analyzer which quickly and accurately measures the total oxygen demand of water from rivers, lakes, marshes, sea areas, factory wastewater and other sources, in either online or offline mode.
This system achieves high-accuracy, stable measurement, which was difficult to achieve with previous BOD and COD analyzers, and reduces use of expensive reagents and other upkeep costs.
The TOD-810 employs Toray Engineering's unique low-temperature sealed combustion system to ensure long-term, stable measurement. It is designed, based on the track record of the previous TOD-800 model, assuming use of the dilution function and stream switching function.


Principle of Measurement

When organic pollutants are subjected to a combustion reaction under high temperatures in the presence of a catalyst, their various components are converted to stable oxides: C becomes CO2, H becomes H2O, N becomes nitrogen oxides, and S becomes sulfur oxides. If the oxygen necessary for the combustion reaction is supplied as gaseous oxygen in the carrier gas stream, then the oxygen concentration in the carrier gas stream will temporarily drop due to the combustion reaction. Therefore, the TOD value can be determined by measuring the change in oxygen concentration of the carrier gas stream.


Measurement range 0-50 / 100 / 200 / 500 mg/l
0-500 / 1000 / 2000 /5000 mg/l*1
Dilution function 2-20 times *2
Stream switching function 2-6 streams *3
Measurement cycle 5 min-10 min
Measurement method Automatic intermittent sealed combustion - oxygen concentration difference detection method
Calibration method Span calibration: Manual
Zero calibration: Manual (With auto zero function)
Conversion function
Washing Automatic washing of injection tube and combustion section; Alternate injection of sample and washing liquid (Washing liquid contained in the unit)
Range setting Manual switching, automatic switching driven by external signal
Construction Standalone console, with casters
Dimensions 720W × 560D × 1500H mm
Weight Approx. 180 kg
Standard liquid Potassium hydrogen phthalate aqueous solution
Repeatability Within ±2.5% of full scale
Zero stability Within ±2.5% of full scale/day
Span stability Within ±2.5% of full scale/day
Ambient temperature variation Within ±2.5% of full scale/5 °C
Measurement value output External output: DC4-20mA (Option)
Range ID signal no-voltage contact: AC125V, 0.05A
Error alarm indication LED display, Closed contact output in case of error (AC125V, 1A)
Alarms Heater temperature control
Detector error
Gas mixer error
Out of carrier gas
Carrier gas pressure drop
No sample
Out of washing water (Option)
Sample conditions Online measurement: 0.02-0.15 MPa, 500 ml/min or higher
Offline measurement: Normal pressure, 100 ml/3 times
Reagents/Utilities Washing liquid:
Distilled water
Carrier gas: Nitrogen gas, Pressure 0.3 MPa
Consumption: 8 Nm3/month
Power AC100V±10V 50/60Hz Approx. 600VA
Set up conditions Indoors
3-40 °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 Only one of these can be selected.
*2 A separate dilution unit (ADU-600) is necessary to add the dilution function.
*3 A separate stream switching unit (VSS-206) is necessary to add the stream switching function. Please designate the necessary streams before determining specifications.

Automatic Total Oxygen Demand Analyzer TOD-810
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