GDYS-201S型五合一多参数水质分析仪是一款适用于多种水质检测的高效仪器，可快速测定生活饮用水、水源水、地表水、地下水和养殖用水等水质中的亚硝酸盐氮、氨氮、溶解氧、pH、盐度和温度等六个参数。该仪器采用高亮发光二极管作为光源，波长为430nm和538nm，测量精度高，氨氮和溶解氧的测量精度为±5%，pH测量精度为±0.2，盐度为±2%，温度为±1%。其测量范围广泛，氨氮为0.10-5.00mg/L，溶解氧为0.1-10.0mg/L，pH为0.0-14.0，盐度为0.2-28%，温度为-50～300℃。仪器设计紧凑，尺寸为190x110x95mm，重量仅0.4kg，便于携带和现场使用。此外，GDYS-201S还具备一次性专用试剂盒，检测速度快，3-10分钟即可完成检测，并能直接显示样品溶液浓度值。

The GDYS-201S five-in-one multi-parameter water quality analyzer is an efficient instrument suitable for the rapid determination of six parameters, including nitrite nitrogen, ammonia nitrogen, dissolved oxygen, pH, salinity, and temperature, in various water qualities such as drinking water, source water, surface water, groundwater, and aquaculture water. The instrument uses high-brightness light-emitting diodes as the light source with wavelengths of 430nm and 538nm, ensuring high measurement accuracy. The measurement accuracy for ammonia nitrogen and dissolved oxygen is ±5%, for pH is ±0.2, for salinity is ±2%, and for temperature is ±1%. It has a wide measurement range: ammonia nitrogen from 0.10 to 5.00mg/L, dissolved oxygen from 0.1 to 10.0mg/L, pH from 0.0 to 14.0, salinity from 0.2 to 28%, and temperature from -50 to 300℃. The GDYS-201S is designed compactly with dimensions of 190x110x95mm and a weight of only 0.4kg, making it portable and convenient for on-site use. Additionally, it features a one-time-use dedicated reagent kit, allowing for rapid detection within 3-10 minutes and direct display of sample solution concentration values.