Purging the Reaction Cell | Teledyne M201E guide

M201E Ammonia Analyzer

Teledyne API Model M201E NH3 Analyzer Operator Manual

signal. This process improves zero baseline stability by minimizing the effect of PMT sensor drift.

1.1.2Purging the Reaction Cell

As with many chemical reactions the conversion of ammonia in the presence of other oxides of nitrogen is complicated. It is important to note that the valve DWELL time for an AZERO measurement has a default setting of 8 seconds. Shortening this value may not allow enough time to properly purge the reaction cell of excess nitric oxide from the previous measurements.

In the molybdenum converter operating at 315oC the following significant reactions are taking place:

Mo + NO2 → MoO3 + NO ~100% Efficiency

The M501 NH3, ammonia converter operates at 825oC. At this high temperature, several reactions occur:

NO → NO		Loss = ~ 3%
NO2 → NO		Efficiency = ~97%
NH3	→ NO	Efficiency = ~97%
NH3	→ NO2	Efficiency = ~5%

As can be seen from the above reactions, the calculation of the ammonia concentration and overall calibration of the instrument must be done carefully, if accurate ammonia concentrations are to be measured.

1.2SPECIAL CONSIDERATIONS FOR AMMONIA MEASUREMENT

Ammonia is a difficult gas to measure due to its chemical characteristics. The gas tends to adsorb onto surfaces and diffuse into many materials. The following precautions should be observed when designing ammonia sampling systems and connecting them to the M201E analyzer:

∙Do NOT use copper tubing or fittings designed for household plumbing.

∙Use ONLY Chromatography grade (cleaned, passivated) stainless steel tubing.

∙Use ONLY Glass tubing for sample inlet manifold.

∙ALWAYS keep the tubing from the M702SS calibrator to the analyzer as short as possible. USE stainless steel tubing throughout, especially from the ammonia calibration bottle to the calibrator.

∙If possible HEAT the sample line and DRY the sample gas.

∙Sample filters Will cause response delays on both the rise and fall of the sample signal.

12	05206H DCN5910

M201E specifications

The Teledyne M201E is a high-performance, compact oceanographic and environmental monitoring device designed for versatile underwater applications. Leveraging advanced technologies, the M201E presents a plethora of features appealing to researchers, engineers, and environmentalists seeking reliable data collection in challenging aquatic environments.

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The M201E is equipped with a range of sophisticated sensors, enabling it to collect comprehensive data on several environmental parameters. Key features include the ability to measure temperature, salinity, depth, and turbidity, among others. This multi-parameter capability allows for detailed assessments of underwater ecosystems and provides essential insights into vital oceanographic processes.

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Moreover, the M201E is powered by advanced battery technologies that maximize operational longevity, allowing for extended missions without the need for frequent maintenance. Users can also benefit from intuitive user interfaces and software, streamlining the process of configuring the device, managing data, and analyzing results.

The M201E’s versatility is further demonstrated by its compatibility with various mounting options and its adaptability to different research or monitoring projects. Whether deployed by autonomous underwater vehicles (AUVs), buoys, or fixed platforms, the M201E meets diverse field requirements.

In conclusion, the Teledyne M201E stands out as a highly functional and reliable tool for underwater research. With its robust design, comprehensive sensing capabilities, advanced communications technologies, and ease of integration, it significantly contributes to our understanding of marine and freshwater environments. As the demand for precise and reliable environmental monitoring continues to grow, the M201E is poised to play a crucial role in the future of oceanographic research and environmental management.