Compliant with standards

Environmental Protection Industry Standard HJ/T399-2007 of the People's Republic of China

Chemical oxygen demand determination - Rapid digestion spectrophotometric method (COD and digestion integrated)

Working principle

The instrument uses a special reagent containing a composite catalyst that accelerates the reaction and has anti-interference effect on chloride ions. The water sample undergoes a rapid oxidation-reduction reaction with special reagents D and E in a digester, and the trivalent chromium ions produced after the reaction are measured for concentration by spectrophotometry to obtain the corresponding COD value.

application

The product is widely used for water quality monitoring in fields such as environmental protection, petroleum, chemical, and hygiene; Suitable for chemical oxygen demand (COD) analysis and testing in groundwater, surface water, domestic sewage, and industrial wastewater.

Instrument characteristics

Accurately measure COD content in various water bodies, with direct reading of concentration

Using different wavelengths to measure high and low concentration water samples to improve testing accuracy

100 sets of data in memory (including test time, absorbance value, concentration value)

20 curves in memory, can be manually or automatically calibrated

Assign USB communication interface to upload data to PC

Intelligent search of database data, which can be searched in sequence or by time

High brightness widescreen LCD display,% transmittance, absorbance, concentration

Test data supports one click printing

Technical Parameter

Wavelength: 420nm and 610nm

Wavelength accuracy: ± 1nm

Wavelength selection: automatic

Transmittance accuracy: ± 2.0% T

Transmission density repeatability: ± 0.5% T

Colorimetric cell: suitable for 1cm × 10cm colorimetric tubes

Anti chlorine interference: ≤ 1200mg/L

Optical stability: The drift of absorbance within 20min is less than 0.002A

Light source lamp: Light emitting diode (LED)

Detector: Silicon photodiode

Data display: 480 × 272 widescreen color LCD screen

Measurement range: 15-150mg/L, error ≤ 8%

150---1000mg/L, Error ≤ 4%

Reading mode:% transmittance, absorbance, concentration

Operation method: keyboard and touch screen

External output: GPRS, USB, RS232 interfaces and computer communication, built-in micro printer (GPRS).

Power supply: 220VAC AC

Instrument size: 280 * 250 * 120mm

Instrument weight: 2Kg (SC-1)

Luminous measurement range: (0-2) A

Temperature range: Operating temperature: 0 to 50 ℃

Storage temperature: -40 to 60 ℃

Humidity: below 85%

COD digester indicators

Number of dissolution pores: 8 pores

Dissolving temperature: 165 ℃± 2 ℃

Dissolving time: 15Min ± 2%

Display mode: LCD display

Insulation characteristics: Resistance to environmental temperature drift ≤+5 ℃