DKK-TOA Corporation - Model COD-201, COD Analyser

Products

Automatic COD Analyser Model: COD-201

This instrument performs analysis of COD (Chemical Oxygen Demand) in river water or plant effluent. The analysis is based on the "Acid Potassium Permanganate Method" (conforms to JIS K0102). In cases where the sample contains a high level of chlorine ions (such as sea water), an alternative alkali measurement method is employed.

Features:

Oxidation / reduction potentiometric titration eliminates the need for electrode reagents.
Input and output terminals provided for a range of telemetry signals including diagnostic alarm outputs, remote stop/start etc.
Auto-calibration module performs pre-programmed calibration sequences.
Internal memory can store of data over a period of 14 days for easy retrieval by operator.
Easy operator input using a touch-screen.

Standard Specifications:

Product Name:	Automatic COD Analyser.
Model:	COD-201.
Measurement Object:	COD concentration of water.
Measurement Method:	100°C digestion with KMnO₄ acidified by sulfuric acid (in conformity with JIS K0102) or 100°C digestion with alkaline KMnO₄.
End Point Detection:	Oxidation / reduction potentiometric titration.
Measurement Range:	Single or dual range (units: mg/l) Specify one of the following:-
(1) Single Range:	0~20, 0~30, 0~40, 0~50, 0~100, 0~200, 0~300, 0~400, 0~500, 0~1000.
(2) Dual Range:	0~20/0~40, 0~30/0~60, 0~40/0~80, 0~50/0~100, 0~100/0~200, 0~200/0~400, 0~300/0~600, 0~400/0~800, 0~500/0~1000 (automatic range selection).
(3) 2 ranges at 2 points:	2 ranges can be selected from those listed in (1) above (range at each measurement point is fixed).
Measurement Cycle:	1 hour per measurement, intermittent measurement cycles available (1,2,3,4,5,6, hour settings).
Measurement Points:	Single or dual points.
Display:	Digital, touch-screen.
Recording Method:	Printer. (1) Year, month, day, hour, minutes. (2) Measurement value mg/l. (3) Measurement status. (4) Analyser fault code. (5) Daily report (max., min., average value, mg/l).
Input Signals:
Remote Start Signal:	Closed contact point every hour.
Monitoring Station Stop:	(Telemetry failure) open contact indicates failure.
Output Signals:
Measurement Value:	Isolated 4~20mA (Max. 600W load).
Under Maintenance:	Closed contacts during maintenance.
Analyser Fault Signals:	Closed contacts if any of the following is detected. (1) Power failure (2) Low cleaning water (3) Low reagent (4) Low sample flow (5) Temperature fault (6) Sensor failure
Temperature & Humidity:	5~40°C, less than 85% (RH).

Sample Conditions:

Temperature:	2~40°C.
Pressure:	Atmospheric (drawn by built-in sample pump with suction head of 1m).
Flow:	0.5~1 l/min. If sample conditions do not meet the above then an optional pre-conditioning tank is required.
Reagent Composition:	(Weekly consumption based on one measurement cycle per hour).
Acid Method:	Extra pure KMnO₄: Approx. 2.5g.
Extra Pure Na₂C₂O4:	Approx. 2.85g.
Extra Pure H₂SO4:	Approx. 0.6 liters.
Extra Pure AgNO3:	Approx. 170g.
Alkali Method:	Extra pure KMnO₄: Approx. 2.5g.
Extra Pure Na₂C2O4:	Approx. 2.85g.
Extra Pure H₂SO4:	Approx. 0.6 liters.
Extra Pure NaOH:	Approx. 34g.
Power Requirements:	100 VAC ±10%, 50/60Hz.
Power Consumption:	Approx. 800VA (max.). Approx. 200VA (average).
Wetted Materials:	Hard PVC, PTFE, silicone, stainless steel.
Enclosure Construction:	Suitable for indoor installation, floor mounting.
Installation Conditions:	Install away from vibration, shocks direct sun-light and electrical interference, allow sufficient maintenance space, provide adequate ventilation if corrosive vapors are present.
Dimensions:	600(W) x 520(D) x 1600(H) mm.
Paint Finish:	Pantone 537C.
Weight:	Approx. 170 kg.

Utilities:

De-ionized Water:	Zero water / cleaning water.
Temperature:	2~35°C.
Pressure:	0.03 MPa (0.3kgf/cm2).
De-ionizer:	Model G-10B, cartridge type ion exchanger (equipped with conductivity meter).
Standard Flow Rate:	50~200 l/hr.
Capacity:	Approx. 1900 liters (raw water conductivity: 200mS/cm).