All about my business

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.

Setup CheckitDirect COD VARIO
The Lovibond® CheckitDirect COD VARIO test setup 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 Lovibond® COD VARIO tube test (LR, MR according to ISO 15705:2003-01), it is heated in the reactor and then analysed in the CheckitDirect COD vario photometer.
The COD-Setup comprises the CheckitDirect COD vario photometer, 25 tube tests for each of the two lower measuring ranges, a reactor for sample digestion, and a vial stand.

Technical data
Optics: temperature-compensated LEDs and photosensor amplifier in water proof sample chamber
Ranges: 0 – 150 mg/ l O2 ±3.5%*), 0 – 1500 mg/ l O2 ±3.5%*), 0 –15000 mg/ l O2 ±3.5%*)
Power: 9 V powerpack battery supply providing 40 hours operation
Auto – OFF: automatic switch-off
Display: backlit LCD (on keypress)
Storage: internal ring memory for 16 data sets
Additional: real time clock and date
Calibration: factory calibration and user calibration. Reset to factory calibration possible
Dimensions: 190 x 110 x 55 mm (L x W x H), Weight 0.4 kg (base unit)
Environmental Temperature: 0 – 40 °C, conditions rel. humidity: 30 –90% (non condensing)
CE: DIN EN 50081-1, conformity VDE 0839 part 81-1: 1993-03, DIN EN 50082-2, VDE 0839 part 82-2: 1996-02
* based on the use of potassium-hydrogenephthalate standards (DIN 38 409)

CheckitDirect COD VARIO
With a measuring range from 0 to 15,000 mg/l O2, the Lovibond® CheckitDirect COD VARIO photometer is suitable for waste water testing. Two LEDs light sources with long-term stability (λ1 = 605 nm; λ2 = 430 nm, according to ISO
15705:2003-01), a waterproof sample chamber, a large digital display, and the user-friendly keypad ensure maximum operating reliability and convenience.

COD VARIO tube tests
The Lovibond® 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 is suitable also for use with Hach photometers.
Standard solutions
Standard solutions are solutions with a defined concentration and are provided to check the operation methods and devices of the cuvette tests as well as the condition of optical filters and the instrument.

COD – reactors ET 108 / ET 125 / ET 125 SC**
Chemical digestion of the samples is a prerequisite for the calculation of COD levels. The required temperatures and reaction time are programmed using the membrane keypad on the front of the Lovibond® reactors ET 108 / ET 125 / ET 125 SC**. All units are equipped with four temperature ranges (70/100/120/150 °C). At the end of the reaction time, the reactors automatically switch off and emit an acoustic alarm.

Technical data for COD-reactors
Temperature: ET 108 / ET 125 / ET 125 SC**: 70/100/120/150 °C ± 0.3 °C
Timer: 30, 60, 120 minutes and continuous operation, automatic switch-off with alarm
Heating: ET 108: 270 Watts, ET 125/ET 125 SC**: 400 Watts, electronically controlled, with protection against overheating
Heating-up time: approx. 10 minutes
Power supply: ET 125: 230/115 V / 50-60 Hz, ET 108 / ET 125 SC**: 230 V / 50-60 Hz
Weight: ET 108: approx. 2.15 kg, ET 125 / ET 125 SC**: approx. 3.60 kg
Dimensions: ET 108: 214 x 133 x 110 mm (L x W x H) ET 125 / ET 125 SC**: 275 x 155 x 95 mm
Approval: CE