Light Source The life for the convergent tungsten lamp is 5000 hours. The outer light source uses transmitting deuterium lamp. The deuterium lamp and tungsten lamp can be controlled separately. (not standard) Measurement Mode Special test module for water quality test Spectrum scanning and peak-picking. Quantitative measurement Kinetics Photometric measurement Monochromator Concave plate holographic grating Detector PORS16： CCD S8378，1024 Pixels  /  PORS16V：CCD ILX511 2048 Pixels Measurement  parts Immerging fiber detector, 10mm pathlength 20mm Pathlength (Exchange) Power supply Inner chargeable battery and one charging for one-day work. With vehicle-loading power supply adaptor （not standard） Charger Operating system Embedded operation system, integration 2M-Flash memorizer. With timing function. Input/display Large touch-screen, 320×240 lattice with backlight Specifications Wavelength range 380nm－800nm / 200nm – 800nm （standard, the main unit has a tungsten lamp） Data resolution 0.6nm Spectral bandwidth 4±1nm Wavelength accuracy <1.0 nm Wavelength repeatability 0.1nm Baseline flatness ±0.005Abs Noise ±0.003Abs Integral time 0.005s-25s Scanning speed >4200nm/s Measurement precision ±2% Measurement item Measurement Accuracy Measurement range COD（low concentration） <±10% 10mg/L-150 mg/L COD（high concentration） <±10% 150mg/L-1500 mg/L Ammonia nitrogen (Nesslers reagent colorimetric method) <±10% 0.03mg/L-2.5 mg/L Cr 6+ <±8% 0.01mg/L-0.6 mg/L Cyanide <±8% 0.001mg/L-0.2 mg/L CODMn <±15% 1.0mg/L-10.0 mg/L Ammonia (hypo-bromate oxidation method） <±15% 0.01mg/L-0.2 mg/L Nitrite <±8% 0.01mg/L-0.2 mg/L   Nitrate（Cd deoxidization method） \ 0.02mg/L-0.5 mg/L Inorganic P（P-Mo method） <±10% 0.05mg/L-1.0 mg/L Dimension 267×170×88mm Environmental temperature Operation environment 0-40℃ Store environment 0-50℃