AF-7550 Dual-channel Hydride-Atomic Fluorescence Spectrophotometer

The AF-7550 dual-channel hydride-atomic fluorescence spectrophotometer launched by Dongxi Analysis is a fully automatic spectral analysis instrument, suitable for trace analysis of twelve elements such as As, Sb, Pb, Bi, Te, Sn, Se, Hg, Cd, Zn, Ge, Au. As the successor of Dongxi Analysis's best-selling atomic fluorescence product AF-7500, AF-7550 realizes functions such as automatic gas flow adjustment, single-point automatic preparation of working curve, and automatic dilution of high-concentration samples. It has higher sensitivity, better stability, more intelligent instrument operation, and wider application range.

Precise and intelligent sampling method design combines six-way injection valve and variable quantitative tube, which retains the advantages of accurate, convenient and durable sampling of six-way injection valve, and realizes single-point automatic preparation of standard curve (linear correlation coefficient ≥0.999), and automatic sample dilution function. After sample concentration overload, the instrument automatically determines the dilution multiple according to the degree of overload, and can automatically calculate the actual concentration of the sample. Unique variable quantitative tube design, with the advantages of syringe pump;

More thorough gas-liquid separation system is mainly based on pump drainage, supplemented by infrared control (patent number: ZL200720104070.7), making gas-liquid separation more thorough and achieving truly colorless flame;  

The gas-liquid separation system uses secondary separation (one-time space-time separation, one-time membrane separation) (patent number: 200720104068.x), and at the same time uses infrared sensor to control liquid level, eliminating the impact of liquid level on analysis. Noise level is greatly reduced, detection limit is greatly improved, and linear range is broadened, improving analysis accuracy;

Humanized, environmentally friendly and gas-saving gas path design, using mass flow meter gas path control module, gas flow control is precise and accurate, flow can be continuously adjusted, stable and reliable. Carrier gas and shielding gas are automatically opened during sampling, and carrier gas and shielding gas are closed 5 minutes after sampling ends. It not only ensures gas saving, reduces analysis cost, but also avoids repeated switching of the flow meter during repeated sampling in a short time, ensuring the stability of gas flow.