COD Set-Ups COD VARIO Determination of the chemical oxygen demand index (ST-COD) Small-scale sealed-tube I Total range 0 - 15000 mg/l I (ISO 15705:2002) Waste water parameter COD The chemical oxygen demand, ST-COD value, 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 consumed in total chemical oxidation of the organic constituents present in the water. COD VARIO Photometer With a measuring range from 0 to 15,000 mg/l O2, the AQUALYTIC® photometer are suitable for waste water testing. Two LED light sources with long-term stability (λ1 = 610 nm ; λ2 = 430 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. AL100 COD VARIO (AL100 photometer in case) AL200 COD VARIO (AL200 photometer in case) 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) ■ Mercury free tube tests, in absence of chloride interference ■ 3 ranges: Low range: 0 - 150 mg/l, meets ISO 15705:2002 Middle range: 0 - 1500 mg/l, meets ISO 15705:2002 High range: 0 - 15000 mg/l Regularly updated information: www.aqualytic.de

COD VARIO tube tests The AQUALYTIC® COD VARIO test set-ups allow highly sensitive and precise water testing with minimum effort. They measure the ST-COD concentration by photometric detection employing a linear relationship between absorbance and concentration. The AQUALYTIC® COD VARIO tube tests are available for the measuring ranges 0-150 mg/l O2, 0-1500 mg/l O2 and 0-15000 mg/l O2. Their chemical properties and a 16 mm tube diameter make them compatible to Hach® devices.* After adding the sample to a AQUALYTIC® COD VARIO tube test (LR, MR according to ISO 15705:2002), it is heated in the reactor...