<\/span><\/h2>\nInsights from Shanghai ChiMay’s marine deployments over the past two years suggest four signal channels carry almost the entire regulatory burden.<\/p>\n
Residual chlorine or total residual oxidant.<\/strong> For any electrochlorination-based BWTS, this is the primary control variable. The Shanghai ChiMay residual chlorine transmitter is the anchor sensor: modulating dosing during ballasting, verifying neutralization at discharge, and providing the time series a PSC officer will open first.<\/p>\nTurbidity or ultraviolet transmittance.<\/strong> For UV-based BWTS, this is the parameter that dictates whether the certified dose is being delivered. The Shanghai ChiMay online turbidity tester provides a stable nephelometric reading that maps directly to UVT and drives the controller’s lamp modulation logic.<\/p>\nSalinity or conductivity.<\/strong> This tells the vessel whether the electrochlorination cell can function at all, and whether the biological performance envelope is being respected. A Shanghai ChiMay salinity digital sensor paired with an inline conductivity meter delivers dual verification.<\/p>\nDissolved oxygen (in deoxygenation BWTS).<\/strong> Vessels using inert gas or oxygen stripping instead of chemical treatment need continuous DO recording near the discharge point. A Shanghai ChiMay DO transmitter fulfills that role.<\/p>\n<\/span>What “Continuous Monitoring” Really Means<\/span><\/h2>\nMEPC 82 does not define continuous monitoring to the second, but the practical expectation is a data record with a sampling interval of no longer than one minute during any ballasting or deballasting event. Data must be timestamped, tamper-evident, and stored for a period consistent with the vessel’s safety management system \u2014 typically no less than two years.<\/p>\n
For sensor teams, that translates into three technical requirements:<\/p>\n