Which instrument is used to measure chlorine residual in water?

An amperometric titrator is utilized for measuring chlorine residual in water because it directly assesses the concentration of chlorine through electrochemical reactions. This instrument operates by applying a voltage to electrodes submerged in the water sample, where the chlorine reacts, generating a current proportional to its concentration. This method is sensitive and precise, allowing operators to monitor chlorine levels effectively to ensure water safety and compliance with regulatory standards.

Turbidity meters, on the other hand, measure the cloudiness or particulate matter in water rather than chlorine levels. A pH meter is designed to measure the acidity or alkalinity of water, which is a different parameter. A flow gauge measures the rate of flow of water in a system and does not provide any information about the constituents of the water, including chlorine. Each of these instruments serves distinct purposes in water quality management, underscoring the importance of using the correct tool for specific analyses.