|Home||» Products||» On-line analyzers||» On-Line Analyzers|
On-line analyzers for COD monitoring in water and wastewater
Three versions of COD on-line analyzers are available:
permanganate index method
UV direct reading method.
The dichromate method follows the international standard where in the sample, after filtration, Potassium Dichromate, Mercury (II) sulfate and Sulfuric acid with a proper catalyst are added; Mercury (II) sulfate concentration is adjusted to mask the expected Chloride amount.
The sample is then heated at 170° for 20 minutes or at 150° up to 2 hours (digestion time and digestion temperature can be adjusted depending on the matrix to digest completely all the substances that give a contribute to COD). After digestion the sample is cooled and the absorbance measured at 592 nm is proportional to a COD concentration.
The permanganate index is defined as the quantity of oxygen, expressed as mg/l, equivalent to the consumed permanganate when a water sample is treated with as solution of potassium permanganate in acid environment and at a temperature of 100°C for 10 minutes. The sample is mixed with diluted sulphuric acid, it is then heated at about 100°C, when the first addition of KMnO4 is performed: this first addition may be followed by others, depending on the measuring range. The digestion time in the standard configuration is set to 10 minutes but it can be selected depending on the matrix.
After digestion the sample is cooled and the decrease of the absorbance measured at 525 nm corresponds to the permanganate consumed by the organic substance.
The UV direct reading method is a more simple method where the COD is correlated to the direct light absorption of the water sample measured at 254 nm.
4. MICROMAC TOC
On-line analyzer for TOC monitoring
in water and wastewater
MICROMAC TOC is a microprocessor controlled On Line analyzer specifically designed for automatic TOC monitoring on several type of water matrices, including sea water.
The analyzer is based on the standard UV-persulphate method coupled with aNon Dispersive InfraRed (NDIR) detector.
Robust and Reliable
Designed for industrial and environmental on-line applications, Micromac C ensures the highest level of reliability in the electronics, mechanics and hydraulics components.
Easy to install
The analyzer is delivered after a long and successful series of factory tests. It is ready for installation, without any further adjustment; it is provided completed with a spare set for start up. To start monitoring activity, Customer needs only to connect sample line, waste line and power supply and to insert reagents and calibrant into the internal compartment.
As soon as user selectable Calibration Time expires, the analyzer perform a calibration cycle, storing and checking the new calibrant O. D. If new O.D. exceeds the selected limits, an alarm contact is closed.
Water sample can be analyzed as it is or after automatic dilution. Automatic dilution can be factory adjusted for high range applications.
Internal air carrier generation
The analyzer includes as standard an internal air generator as carrier gas.
User selectable; between two measurements the analyzer remains in stand by mode, without reagents consumption.
Features and benefits
Fully automatic operation
Long autonomy; low maintenance, low operating cost
Low reagents consumption; short preparation time; low disposable costs
Easy operation; plug in analyzer, no special training is required
Electronics and hydraulics completely separated
Serial interface for local o remote PC connection.
Lake Worth Road # 215 Lake Worth FL 33467 USA
Phone No.:- +15618569948, + 15614275000, + 1-561-429-9552
Fax No.:- +15614296879
Singapore Pasir Ris Drive 1, Singapore 510634
Phone No.:- +65 82682912
Thailand 19 Sol, Sukhumvit, Bangkok
For more details, visit us at www.333india.com