Electro-Chemical Devices’ (ECD) Triton DO9 Dissolved Oxygen Analyzer is a good fit for the continuous measurement of trace levels (ppb) of dissolved oxygen in aqueous systems supporting steam turbine-driven electric power generation plants. By continuously and directly monitoring ppb levels of dissolved oxygen, the analyzer eliminates grab-sampling errors and ensures reliability. The sensor is a three-electrode amperometric sensor, with a gold cathode, current-less silver-silver bromide reference electrode, and current-carrying counter electrode. The sensor’s electronics include a closed control loop that adjusts the oxygen-specific working potential at the gold cathode, continuously optimizing the potential to the working electrode versus the reference electrode. This function calculates an optimum polarization voltage from the instantaneous sensor current and controls it, leading to an effective minimization of the oxygen-independent zero current, therefore offering a better signal resolution and linear calibration function even at very low oxygen concentrations. The sensor performs all signal-conditioning, calibration and diagnostic functions inside the sensor, minimizing maintenance over long service intervals while providing stable, dependable trace DO measurement. It requires only air calibration and features a clip-style design for easy installation and removal of the flow cell. After air calibration, the orientation of the inlet and outlet sample lines automatically purges air from the flow cell when the sensor is returned to service. The measurement chamber is optimized for fast response and all wetted parts are 316L stainless steel. The sensor measures dissolved oxygen from 0.001 mg/L to 20.00 mg/L (0.0 percent to 200.0 percent SAT, 0 hPa to 400 hPa) for maximum accuracy. It offers long-term stability, with drift <1 percent per month with continuous polarization. It operates at a process temperature range of -5 C to 50 C and at a process pressure range of 10 bar (145 PSI) maximum overpressure. The sensor features a response time at t90:30 seconds and t99:90 seconds and a polarization time < 60 minutes. – ecdi.com