COD (Chemical Oxygen Demand) is a term used to measure the quality of water. It
is a measure of water pollution resulting from organic matter. This parameter is
defined asthe amount of oxygen (in milligrams per liter of sample) required. forthe
oxidation of all organic matter contained in a water sample. COD limits are set by
competent authorities for various effluents permissible for accepting them in
Effluent Treatment Plants or for releasing them to the environment. Among the
various methods and instruments available. a non-dispersive absorption based
instrument has been found to be the best for this.
Features
COD Analyzer is a
microprocessor-based instrument for the
determination of COD in the range of 50-2000
mg/L in water sample. The analysis involves the
measurement of absorbance of the digested
sample using the COD Analyzer and relating it to
the COD of the sample. The digestion of the sample
water involves the water sample being treated
with Mercuric Sulphate to remove the interference
of chloride ions and subsequently mixing it with an
appropriate amount of oxidizer mixture viz.
Potassium Dichromate, Silver Sulphate catalyst
and Sulphuric Acid and digesting the mixture in a
closed vial at 1500 Cfor 2 hours.
- Rugged, portable design with no moving parts
- Computer and printer interface
- On board memory. stores up to 1000 test results along with time and date
Specifications
- Principle: Absorption method
- Oxidiser & Complexing Agent: Potassium Dichromate, Mercury Sulphate in acidic medium.
- Measuring Range: 50-2000 mg/L without dilution.
Range extended up to 200,000 mg/L with 5, 20 or 100 times dilution
- Resolution: 1 mg/L
- Accuracy: ± 10% of reading, also depends on accuracy of standards.
- Display: 16 x 2 LCD
- Reproducibility: +/-10% of reading.
- Sample Volume: 1 mL
- Battery: Lithium-Ion rechargeable battery
- Dimensions: L=240mm, B=125mm, D=110mm.
- Weight: 2.3 kg
- Storage: Can store up to 1000 test results with date & time
- Interface: Serial interface to the Computer or printer for data transfer
- Data Transfer: Data can be downloaded to the printer or on the computer through USB port
COD Digester
- Heater Block Dimensions: L=350mm, W=290mm, D=220mm
- Display: LED Based Digital Display
- Power Consumption: 250 W
- Temperature Range: Room Temperature to 150°C
- Temperature Accuracy: ±1°C
- Temperature Controller: PID
- Tube Cavity: Dia=17mm, Depth=40mm
- Number of Cavities: 25 Cavities to Accommodate 25 Glass Tubes
- Glass Tube Size: Outer Diameter=16mm, Length=75mm
- Timer: The timer initiates as soon as the temperature is achieved. When the set time period is
over the heaters get switched off automatically and give the alarm.
- Buzzer: Alarm for cycle end
- Power Supply: 230V AC, 50/60Hz
- Weight: 12.5 kg