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Portable Laser Analyzer for Ultra-sensitive Ammonia Monitoring

HealthyPhoton's ultra-sensitive ammonia analyzer is based on the second-generation semiconductor quantum cascade laser (QCL) technology.It uses laser's ultra-narrow linewidth to accurately select the high-intensity absorption line of ammonia molecules in the mid-IR region, thereby achieving high-selectivity,high-precision, and robust measurement.

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The ammonia concentration of 2~3 ppmv in flue gas is a great challenge for the accurate estimation of ammonia slip and DeNOx process in most coal-fired power plants. Most of the existing near-IR laser spectroscopy based monitors cannot achieve reliable accuracy under harsh field conditions at the coal-fire SCR outlet. The traditional in-situ cross-duct sensor has an issue that the laser beam cannot penetrate due to high dust. In the meanwhile, vibration, expansion, and contraction of the duct affect the accuracy and the stability of the laser beam, leading to loss of signal, which increases maintenance costs.

   Recently, some products have used extractive sampling+near-IR diode laser+multi-pass absorption gas cell technology to make use of a long optical path to compensate for the weak absorption of near-IR spectral lines. However, the long-pathlength absorption cells are not suitable for the severe working conditions of high dust, high temperature and high ammonium bisulfate salt (ABS). After a long-term operation, the cleaning and beam re-alignment of the optical cell greatly increase the difficulty and maintenance cost.


• QCL+TDLAS technology has a measuring range of 0-20ppmv and accuracy up to 0.01ppmv;

It does not need the long-pathlength multi-pass absorption gas cell, thereby reduces the difficulty of maintenance and extends the maintenance period;

The direct high-temperature extractive sampling method eliminates beam walk-off challenges facing by in-situ cross-duct laser-based sensors;

The sampling pipeline length is less than 3 meters, which reduces the signal delay and  improves the real-time feedback for DeNOx optimization;

 The sample flow rate can be as low as 250 mL/min, which can reduce probe wear and reduce maintenance costs;

 Mid-IR laser spectroscopy provides an optional simultaneous measurement of NH3 and NOx with a single probe. Combined with the grid measuring method, the NH3-NOx molar ratio distribution can be assessed using a single analyzer.



2nd generation QCL+TDLAS


Measuring range

0 ~ 20ppmv (can be customized)

Response delay (T90)


Linear error/


Detection limit


Detection accuracy


maintenance cycle

≤2 times/year

Preheating time

~30 mins


486 x 230 x 380 mm3 (L×W×H)


16 kg (not incl. pretreatment)

Work condition

Power supply

200 ~ 240 VAC 50Hz


-10 ~ 50°C (No condensation)

Flue gas temperature

100 ~ 600°C

Power consumption

<1.5KW (peak)


Sampling method

Hot-and-wet direct extraction (incl. NOx)

Sample flow rate

0.25L/min ~ 5L/min

Sample gas temperatue

≧200 °C

Water content

No need for water removal

Dust removal

2-level  filtration, accuracy < 0.5μm



Touch screen (HMI)

Analog output

4-20mA output (max. load 750Ω)

Digital output


Optional: GPRS data backup at HealthyPhoton Cloud server

Field Experiment Result

The product has been field-tested in several power plants across China. The product’s reliability, stability,  technological advancement, and portability features have been well recognized by users. 

Standard gas response & repeatabiliy test:

  • Model:LGM1600-NH3-P Portable Laser Analyzer for Ultra-sensitive Ammonia Monitoring

    HPLGM1600-NH3-P Portable Laser Analyzer for Ultra-sensitive Ammonia Monitoring
Healthy Photon Co., Ltd. all rights reserved. ICP: 沪ICP备14038530号
Tel: +86 15618922826 Addr: Building 4, No. 200, Guoding East Road, Yangpu District, Shanghai;
Tsinghua Innovation Park, No. 255, Zicheng Road, Yinzhou District, Ningbo City, Zhejiang Province