Beverly, MA, Jan. 9, 2006 — Thermo Electron Corp., a global manufacturer of analytical instrumentation, unveiled the Orion ionplus 2111LL low level sodium monitor used to monitor the sodium ion content of steam and other pure water circuits within the power industry.
As efficiency reductions and equipment failures attributable to corrosion and deposition cost the power industry billions of dollars each year, Thermo Electron has developed a next-generation sodium monitor that reaches the lowest levels of sodium ion detection available on the market.
Thermo says the Orion ionplus 2111LL helps reduce costs by maintaining a balance in water and steam chemistries through continuous monitoring of chemical species such as sodium that are linked to the corrosion process.
The heart of the Orion ionplus 2111LL utilizes the patented ROSS Ultra Sodium Electrode technology. The electrodes use a specially selected sodium glass composition that provides enhanced selectivity, detection limits, and linearity even with minimum sodium ion exposure. This results in accurate measurements in ultra-pure and pure water samples allowing an unmatched drift-free reference system and greater stability at low levels of detection.
The electrodes have exhibited vastly improved performance in samples that vary in temperature, or differ in temperature from calibrating standards. The ROSS Ultra Electrode’s special internal design provides faster response, greater accuracy and more reproducible results than conventional electrodes without the use of silver chloride:
* Response is FAST ï¿½ readings stable to 0.01 ppb, +/- .01 ppb Na+ even in samples varying from one another by 50 °C or more.
* Over the temperature range of 0 to 100 °C results are three to five times more accurate than those obtained with conventional electrodes.
* Drift is minimal at
Continuous monitoring of sodium levels in the power plant water/steam circuit has grown considerably in recent years. Two of the most significant reasons for this trend are the greater understanding of the effects of sodium contamination on turbines and a movement toward higher operating pressures in modern steam generators. Studies have shown that sodium is one of the most significant contributors to corrosion within turbines and that the corrosion indisputably leads to cracking, embrittlement, and ultimately, turbine failure.
Advanced Technologyï¿½measures to parts per trillion levels
While many sodium monitors are rated at 0.1 ppb, the Orion ionplus 2111LL can reliably measure to extremely low levels – 0.01 ppb (10 parts per trillion). These levels require sensing electrodes that are not only highly sensitive to low levels of sodium, but also able to respond to changing levels in the stream in a linear manner both up and down the range without losing their linearity or stability. This is only possible with a complete chemistry system that conditions the sample pH, suppresses hydrogen and other interferences, adds necessary reagent and smoothes out the noise and spikes present with rapid changes in sample concentrations.
The Orion ionplus 2111LL is further enhanced by the use of a patented pending flow cell that completely separates and isolates sample from reference solution contamination. The flow cell is able to move the sample with no pumps or moving parts using an Air-Carrying system that “lifts” the sample past the measuring electrode and stirs the sample for fast reaction to any changes in sodium levels. The flow cell design also isolates the sample from any interference and allows for precise calibration dilutions that are easy, fast and reliable.
Calibration is easy using a highly accurate system of “Double Known Addition (DKA),” which allows any user to calibrate the system to the highest degree of precision and allow sample measurements to be extremely accurate for extended periods of time with no human intervention and long calibration cycles.
Thermo Electron has developed a method to quantify low sodium levels by sodium electrodes through the technique of on-line dynamic dilution. The technique does not require extremely low-level standards or collection and transport of grab samples. The key component is a syringe pump capable of delivering a steady flow rate in the range of 0.l mL/min. An injection port is installed at an appropriate location on or upstream of the analyzer and varying levels of analyte can be injected. The principal assumptions in this experiment are that accurate spike recovery imply an accurate sample reading and that the sample sodium concentration does not change during the course of a run