The AV420 is a single-input high-range dissolved organics monitor designed for surrogate color monitoring of raw water in potable water treatment plants, detecting organic carbon levels from 0 to 100 mg-1C to enable predictive coagulant control and algal bloom toxicity alerts. It operates reagentlessly with automatic turbidity compensation using dual-wavelength UV absorption (254 nm and 400 nm) and includes a programmable auto-cleaning system. The monitor updates measurements every 2 seconds and requires minimal maintenance, with annual wiper blade replacement and calibration needed only once or twice yearly. The transmitter features a dual 4½-digit LCD display, two isolated 0-20 mA current outputs, three programmable relay outputs, and operates on 100-240 V AC or optionally 12-30 V DC. It is rated IP65, measures 192 h × 230 w × 94 mm deep, and meets EN61326, EN50081-2, EN50082-2, and EN61010-1 standards for industrial environments.
AV420 single-channel high-level dissolved organics monitors act as surrogate color monitors on coagulation control applications to provide early warning of increase in organics from decay of algae blooms for potable water treatment works
Long term field trials have shown that maintenance demands on these applications are minimal.
| ABB Measurement & Analytics | |
|---|---|
| Product Category | Dissolved CO2 Instruments |
| Product Number | AV420 |
| Product Name | Dissolved Organics Monitor |
| Form Factor | Panel (optional feature); Wall, Pipe |
| Communication Network/Bus Compatibility | PROFIBUS |
| Features and Functionality | Extreme Environment |
| Dissolved CO2 Range | 0 to 100 ppm |
| User Controls | Digital Front Panel |
