Ammonia Process Analyzer

A diode array process analyzer, ammonia analyzer & NOx analyzer, ammonia slip analyzer

Ammonia Analyzer

Ammonia slip & NOX concentration

A diode array process spectrophotometer for the DeNOx process control

The flue gas stream contains ammonia, nitrogen oxides and in some cases sulfur dioxide ¹. These components all absorb UV radiation, and therefore can be monitored by process analyzers that utilize UV absorbance techniques for detection such the ASA-400 ( incorporating a process diode array UV VIS spectrophotometer).

The full spectrum analysis advantage

The following figures show the absorbance spectra of: ammonia, nitrogen oxide, nitrogen dioxide and a mixture of all three in a process stream, one can immediately see that the absorbance features strongly overlap. A full high resolution spectral analysis is, therefore, essential. High accuracy at a relatively wide dynamic range is achieved due to the sharp absorbance features of the components measured by the high resolution process spectrophotometer.

Use / Application	Measurement of minute quantities of ammonia gas NH₃ (slip stream), nitric oxide (NO), nitrogen dioxide (NO₂) and sulfur dioxide (SO₂).
Process	DeNOx Catalytic and non catalytic removal of nitrogen oxides(SCR, SNCR).
Industry	Power generating plants
Measurement mode	Continuous on-line
Measurement range	NH₃ 0-20ppm (± 1ppm) , SO₂ 0-2000ppm (± 3% of measurement) NO , NO₂ 0-600ppm (± 1% of measurement)
Measurement principle	Diode array UV industrial spectrophotometer
Probe:	Hastalloy - cross stack averaging (up to 8 meters long
Sample line	5 meters long (280 ° C) Hastalloy (other lengths - optional)
Output:	RS-232 four 4-20mA galvanically isolated outputs.
Ambient temperature:	-20 to 55 ° C



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A diode array process spectrophotometer for the DeNOx process control The flue gas stream contains ammonia, nitrogen oxides and in some cases sulfur dioxide ¹. These components all absorb UV radiation, and therefore can be monitored by process analyzers that utilize UV absorbance techniques for detection such the ASA-400 ( incorporating a process diode array UV VIS spectrophotometer). The full spectrum analysis advantage The following figures show the absorbance spectra of: ammonia, nitrogen oxide, nitrogen dioxide and a mixture of all three in a process stream, one can immediately see that the absorbance features strongly overlap. A full high resolution spectral analysis is, therefore, essential. High accuracy at a relatively wide dynamic range is achieved due to the sharp absorbance features of the components measured by the high resolution process spectrophotometer.
Accuracy: NH₃ ±1ppm ; NO ±1ppm ;NO₂ ± 1ppm