荷兰采购需求：DO计，溶解氧仪，在线溶解氧仪，便携式溶解氧仪，光学溶解氧仪，溶解氧分析仪

We're looking to install a reliable salinity sensor for our Cascade tank on the ships' boilers. It's crucial that the sensor offers accurate readings and alerts us at a PPM level of 10 and above. Please provide recommendations on the best-suited sensors for this application. We're interested in two configurations: one with local visual alarm indication and another with both audio and visual alarms, including a remote alert option. Detailed pricing and specifications would be appreciated. Thank you!