以下是空气现场二氧化硫测定仪 GDYK-402S 的产品中英文介绍：

GDYK-402S空气现场二氧化硫测定仪是一种便携式仪器，能够快速、准确地检测空气中二氧化硫的浓度。该仪器采用盐酸副玫瑰苯胺分光光度法进行检测，检测速度快，仅需10分钟即可完成。其测定下限为0.01mg/m³，测量范围在0.00-0.50mg/m³之间，测量精度达到5%。仪器配备专用样品前处理设备和一次性试剂盒，可现场定量检测出空气中二氧化硫的含量。它广泛适用于居住区、室内、室外和公共场所空气中二氧化硫的定量测定。

The GDYK-402S Airborne Sulfur Dioxide Detector is a portable instrument capable of quickly and accurately measuring the concentration of sulfur dioxide in the air. It employs the pararosaniline hydrochloride spectrophotometric method for detection, with a fast detection speed of only 10 minutes. The instrument has a detection lower limit of 0.01mg/m³, a measurement range of 0.00-0.50mg/m³, and a measurement accuracy of 5%. It is equipped with dedicated sample pretreatment equipment and disposable reagent kits, enabling on-site quantitative detection of sulfur dioxide in the air. It is widely used for quantitative determination of sulfur dioxide in residential areas, indoors, outdoors, and public places.