Highlights
- ST-COD sealed tubes ready for use
- Suppression of chloride interference
up to 1000 mg/ l ( LR & MR)
up to 10000 mg/ l ( HR)
- 3 ranges:
Low range: 0 – 150 mg/ l
Middle range: 0 – 1500 mg/ l
High range: 0 – 15000 mg/ l

Description
Waste water parameter COD
The chemical oxygen demand, ST-COD value ( ST = small scale sealed tube) , of water as determined by this dichromate method can be considered as an estimate of the theoretical oxygen demand, i.e. the amount of oxygen con- sumed in total chemical oxidation of the organic constituents present in the water.

AL200 COD VARIO Photometer
With a measuring range from 0 to 15, 000 mg/ l O2, the AQUALYTIC® COD VARIO photometer are suitable for waste water testing.

Two LEDs light sources with long-term stability ( » 1 = 430 nm ; » 2 = 610 nm, according to ISO 15705: 2002) , a waterproof sample chamber, a large digital display, and the user-friendly keypad ensure maximum operating reliability and convenience.

Setup AL200 COD
The AQUALYTIC® COD VARIO set-up allows highly sensitive and precise water testing with minimum effort. It measures the ST-COD concentration by photometric detection employing a linear relationship between absorbance and concentration.
After adding the sample to a AQUALYTIC® COD VARIO tube test ( LR, MR according to ISO 15705: 2002) , it is heated in the reactor and then analysed in the photometer.

Set-Up AL200 COD VARIO
The AQUALYTIC® COD VARIO set-up allows highly sensitive and precise water testing with minimum effort. It measures the ST-COD concentration by photometric detection employing a linear relationship between absorbance and concentration.
After adding the sample to a AQUALYTIC® COD VARIO tube test ( LR, MR according to ISO 15705: 2002) , it is heated in the reactor and then analysed in the photometer.

Ranges
0 – 150 mg/ l O2 ± 3, 5% * ) FS
0 – 1500 mg/ l O2 ± 3, 5% * ) FS
0 – 15000 mg/ l O2 ± 3, 5% * ) FS
* tolerance based on the use of potassium-hydrogenephthalate standards ( DIN 38409)

Scroll Memory ( SM)
To avoid unnecessary scrolling for the required test method, the instrument memorizes the last method used before switching off the instrument. When the instrument is switched on again, the scroll list comes up with the last used test method first.

Technical Data
Optics LEDs, interference filters ( IF)
and photo sensor in transparent sample chamber.
Wavelength specifications:
430 nm interference filter
610 nm interference filter
Wavelength Accuracy ± 1 nm
Photometric Accuracy 3% FS ( T= 20° C– 25° C)
Photometric Resolution 0.01 A
Power Supply 4 batteries ( AA) , capacity approx. 53 hours or 15000 tests ( continuous operation with backlit switched off)
Auto - OFF automatic switch-off
Display backlit LCD ( on keypress)
Storage internal ring memory for 16 data sets
Interface infrared interface for test data transfer to IRiM
Additional feature real time clock and date
Calibration factory calibration and user calibration. Reset to factory calibration possible
Dimensions 190x110x55 mm ( LxWxH)
Weight basic unit approx. 455 g ( incl. batteries)
Environmental conditions temperature: 5 – 40° C rel. humidity: 30 – 90% ( non condensing)
CE-Conformity