Swan AMI Codes-II Colorimetric Chlorine and Disinfectant Analyzer

Online DPD analyzer for chlorine and other disinfectants

The Swan AMI Codes-II is a complete monitoring system for the automatic, continuous measurement and dosing control of chlorine and other disinfectants. It works on the DPD colorimetric method, referenced in the manual as AWWA 4500 Cl-G and EN ISO 7393-2. Swan lists it for potable water, swimming pools, cooling water, effluent and seawater, and for water that contains additives such as corrosion inhibitors, cyanuric acid and antiscalants.

Free chlorine, chlorine dioxide, bromine and iodine are measured with the Oxycon on-line DPD and Oxycon on-line Buffer reagents. Measuring monochloramine or ozone needs an additional Oxycon on-line KI reagent, which is added to the buffer. The swan.ch product page describes the instrument as a plug-and-play system that is wet bench tested and calibrated before delivery.

Technical specifications

Values come from the Operator’s Manual A-96.250.571, section 2.1 Instrument Specification.

How a measurement cycle works

The sample flows through the inlet filter into a constant head with an overflow, so that a small part always runs to drain. A part of the stream enters the mixing chamber, where a peristaltic pump adds the DPD and buffer reagents. The mixed sample flows through the photometer and the colour is read. Afterwards the sample is aerated to create bubbles and passes a bubble detector to the photometer drain.

Diagnostic functions include automatic zero point determination and flow control, and a reagent level detector warns when reagent is running out. Data is stored in non-volatile memory, inputs and outputs have overvoltage protection and the measuring inputs are galvanically separated from the signal outputs. A potential-free input can freeze the reading or interrupt control from an automation system.

Selecting and maintaining the analyzer

Choose the reagent set for the disinfectant, since monochloramine and ozone need the KI reagent. The manual covers maintenance of the pH sensor, replacement of pump and reagent tubes, cleaning of the protective filter, photometer and flow cell, and verification and calibration procedures. The swan.ch page adds a solid-state verification kit for the photometer.

The panel dimensions and weight differ between the manual and the web page, so they are not given here; request the drawing when planning the mounting. Reagents are consumables ordered separately. Confirm the disinfectant, range, pH or cleaning options, communication interface and supply type in the enquiry.

Documents and quotation

The attached Swan Operator’s Manual A-96.250.571 (firmware V6.20 and higher) is the main source for this page, together with the AMI Codes-II product page on swan.ch. Seven Star LLC supplies Swan products as an independent supplier in Muscat. Send the disinfectant, range, supply and quantity with your enquiry. Browse other liquid analytical systems for related analyzers.