The VT-7900 fully automatic laboratory water quality analysis system is a fully automatic COD analyzer based on HJ/T 399-2007 "Determination of Chemical Oxygen Demand in Water Quality—Rapid Digestion Spectrophotometry" and USEPA digestion colorimetry. This product integrates functions such as automatic sample and chemical addition, stirring, mixing, cleaning, digestion, and measurement, aiming to achieve a high degree of automation throughout the experimental process, improve the accuracy and precision of experimental data, reduce the harm of laboratory chemical reagents to experimenters, and ensure that water quality testing and analysis are conducted safely, accurately, and effectively.

Measurement Parameters:

COD

Typical Applications:

Petrochemical, municipal, environmental protection, third-party testing, and other industries

Instrument Features:

● Fully automated sample pretreatment and measurement processes, freeing up manual labor and enabling unattended operation.

● Possesses large-scale sample preprocessing and measurement capabilities

● Requires less reagent, safer and more environmentally friendly, using a 16mm COD pre-prepared reagent with hash

● Uses a high-precision injection pump to achieve accurate sample addition, reducing manual experimental errors

● Automatic cleaning of the inner and outer walls of the injection needle prevents cross-contamination and reduces memory effectiveness

● Automatic stirring easily achieves homogenization of particulates and suspended matter in samples

● Intelligent human-machine interface, simple and easy to use, capable of automatically generating reports and data output

● Automatic rotation of the robotic arm, multi-point color comparison, automatic equalization, eliminating measurement interference for more accurate measurement

Technical Specifications
Measurement parameters	Chemical oxygen demand COD
Measurement method	COD: 2-hour standard method and 20-minute fast method;
Meets the standards	COD standard: 20-minute rapid method complies with HJ/T399-2007 "Determination of Chemical Oxygen Demand in Water Quality - Rapid Digestion Spectrophotometry Method"; The 2-hour standard method complies with the U.S. Environmental Protection Agency (USEPA) 5220D standard method: ammonia nitrogen: Spectrometric colorimetric unit: complies with JJG178-2007 "Verification Procedures for Ultraviolet, Visible, and Near-Infrared Spectrophotometers."
Measurement range	2-hour standard COD: low range (3~150 mg/L); High range (20~1500 mg/L); Ultra-high volume (200-15000 mg/L) 20-minute rapid COD: low range (15-150 mg/L); High range (100-1000 mg/L).
COD reagent is resistant to chlorine interference	Low and high range: chloride ions<2000 mg/L; Ultra-high range: chloride ion < 20,000 mg/L;
Number of sample bits	48 bits, supports expanding sample slot count (optional external automatic sampler).
Number of digits	48 bits
Digestion temperature	Room temperature~190°C, 2-hour method program default digestion temperature 150°C, 20min quick method program default digestion temperature 165°C;
Resolution time	2 hours or 20 minutes, and you can also customize the dissolution time
Eliminates temperature indication errors	±1℃；
Temperature uniformity is resolved	≤3℃；
Cooling method	auxiliary air cooling device to accelerate cooling and cooling the reagent tube after digestion;
Calibration curve	The instrument has built-in calibration curves for COD pre-prepared reagents with different scales;
Injection volume	0-10ml, supports customization;
Injection accuracy	≤1%；
Injection method	Direct contactless injection technology for injection pumps;
Cleaning function	Automatically cleans the inner and outer walls of the injection needle after injection;
Dilution function	Supports automatic dilution;
Allows sample particle sizes	160 μm；
Multipoint colorimetric measurement	Supports automatic rotation of pre-prefabricated reagent tubes, enabling multi-point colorimetric measurement and automatic average calculation;
Communication method	Supports uploading data to the LIMS system (users must provide data interfaces);
Instrument control method	PC software;
Warning function	If the pre-prepared reagent tube cannot be unscrewed, the instrument will trigger an alarm alert;
Power requirements	AC220V±10%，50Hz，1700W
Operating temperature and humidity	15℃~35℃； Relative humidity: 15%~80%;
Instrument size	1100 mm x 950 mm x 780 mm (length x height x depth);

Mailing Address: Building B, No. 168 Jinyan Road, Jianxin Town, Cangshan District, Fuzhou

Postal Code: 350007

Customer Service Hotline: 400-668-8627

Main Line/Fax: 0591-83305533/83305866

Email: fgwater@fuguang.com

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