巴西采购需求：浮标多参数分析仪，浮标水质仪，多参数水质分析仪，多参数变送器，多参数分析仪，在线多参数控制器

I'm interested in the IoT Multi-parameter Water Quality Buoy designed for river monitoring. I'd love to get more details on how the monitoring process is carried out, particularly if it relies on sensors. Additionally, it would be helpful to know how often these sensors need to be cleaned and calibrated, along with the recommended calibration frequency. Do the sensors require specific calibration solutions as well? Also, I'm curious about the buoy's configuration. Is it a closed system that measures pH, temperature, conductivity, dissolved oxygen, and turbidity, or can it be tailored based on the specific parameters we want to monitor? Could you please provide a quotation for one of these buoys? Thank you!