Optical Based Process and Compliance Measurements
The successful operations of the ceramic filter technology in both the industrial and marine environment has driven adoption of disruptive technology including both Tunable Diode Laser (TDL) and Differential Optical Absorption Spectrometer (DOAS) based analyzers. These technologies provide high accuracy at a lower cost than traditional extractive CEMS with the features and advantages listed below.
Features and Advantages for TDL and DOAS
- Cross Stack - Non-intrusive
- No parts located in process stream
- No corrosion
- No particulate buildup on probe
- Closed cell calibrations (no compressed gas standards required)
- DOAS UV lamp is safely located in analyzer away from process
- Minimal maintenance and consumable parts required
- Clean optics enclosure windows quarterly
- Replace blower dust filter quarterly
- Replace xenon lamp 3-5 years
- Calibrations performed at analyzer, not at probe
The diagram shows the basic components of each system and most importantly shows the absence of sample lines, calibration gas cylinders, gas conditioning panels, and a dedicated shelter.
| Specifications | |
|---|---|
| Path Length | Up to 2 meters |
| Dynamic Range | 5 orders of magnitude |
| Response Time | 0.1 seconds and higher |
| Calibration | Factory set |
| Light Source | Deuterium lamp/Xe Arc lamp |
| Air Purge | 0 to 15 L/min |
| Operating Conditions | |
|---|---|
| Source Gas | Optics |
| -100 to 1,800 C | -40 to 65 C |
| 5-95% RH | 5-95% RH |
| 25-2,000 mbar | 25-2000 mbar |
| System Sensitivities | |||
|---|---|---|---|
| Gas | Detection Limit | Gas | Detection Limit |
| ppbv | ppbv | ||
| NO | 600 | O3 | 35 |
| NO2 | 75 | Benzene | 170 |
| NH3 | 10 | Toluene | 600 |
| SO2 | 300 | HCHO | 3000 |
| SO3 | 500 | ||
These non extractive systems are incorporated into all of the projects developed by Precision Partners and have proven to provide superior accuracy, with much less maintenance, resulting in less downtime, less operating cost, and at a lower initial installed cost than traditional CEMS for more than 10 years. The technology was and continues to be refined by Unisearch Inc out of Toronto Canada and fully turnkey systems are designed, fabricated, and delivered by our technology partner, CEMTEK KVB-Enertec.
