Analyzer LaserGas™ III SinglePath NH3 DeNOx


NEO Monitors LaserGas™ III ammonia analyzer (3rd generation) is specially designed for operation in hazardous areas and it provides real time in-situ NH3 measurements for virtually any type of DeNOx systems. The configuration is transmitter/receiver units for cross-duct/stack installation. An external junction (cable connection) box simplifies installation and maintenance. The operation principal is based on well proven Tunable Laser Absorption Spectroscopy (TLAS) implemented using fast scanning absorption technique with fully digital signal processing. Years of experience allowed us to carefully design this highly compact NH3 analyzer which offers exceptional performance in harsh environments, is truly robust and provides immediate benefits in terms of operation ease and low cost ownership.

Technical data

Detection limit (NH3): 0.2 ppm **
Default range: 0 – 50 ppm; Other ranges on request
Range H2O: 0 – 40% vol
Max. process gas temperature: 450 °C
Max. process gas pressure: 1.5 bar abs
Optical path length: Typically 0.5 – 5 m ***
Repeatability: +- 0.2 ppm or +- 1% relative, whichever is greater (application dependent)
Linearity: < 1 % of range
Response time: 1 second or longer (configurable)

Environmental conditions
Operating temperature: -40 ºC to +65 ºC (extended rating -40 ºC to +65 ºC on request)
Storage temperature: -40 ºC to +70 ºC
Protection classification: IP65

Inputs / Outputs
Analog output (3): 4-20 mA current loop (concentration NH3, transmission, concentration H2O)
Digital output: 10/100 Base T; Ethernet (Modbus TCP)
Relay output (2): High gas, warning and fault (normally closed); Analog input: 4 – 20 mA process; temperature and pressure reading

Power supply: 24VDC; range 18-32 VDC
Power consumption: Max. 10 W;
4 – 20 mA output: 500 Ohm max. load impedance, not isolated
Relay output: 1 A at 30 V DC/AC

Installation and Operation
Flange dimension: DN50/PN10 or ANSI 2’’/150 lbs (other dimensions on request)
Alignment tolerances: Flanges parallel within 1.5º
Purging of windows: Compressed dry and oil free air (recommended) or air blower
Purge flow: 5 -100 l/min ( application dependent)
Calibration: Lifetime, no routine calibration needed

Laser class: Class 1 according to IEC 60825-1, eye safe
CE: Certified
EMC: Conformant with directive 2014/30/EU

IECEx/ATEX zone 1: II 2 G Ex d [op is] IIC T4 Gb; (TU/RU) II 2 D Ex tb IIIC T78°C Db; II 2 D Ex tb IIIC T88°C Db (Lasergas III Ext)
CSA: Class I Div. 1, Groups B, C and D

ATEX rating connection box: II 2 GD Ex e IIC T5 Gb; -40°C ≤TA≤65°C
Functional safety: Designed according to SIL 2; IEC 61508

Dimension and weight
Transmitter and receiver unit (TU/RU): 215 mm (length, add 50 mm for purge unit) x 125 mm (diameter), 3.5 kg each TU/RU connection box: 260 x 160 x 90 mm, 2.5kg
**NOTE: Detection limits are specified as the 95% confidence interval for 1 m optical path and gas temperature / pressure = 25ºC / 1 bar abs. Measured in N2.
*** Insertion tubes may be needed to shorten path length for very high dust loads. Special process conditions on request.

Additional information


NEO Monitors


Cement plants, Chemical and petrochemical industry, Coke plants and steelworks, Gas industry, Heavy industry, Laboratories and research institutes, Power and heat, Production of technical gases, Sugar-factory, Waste incineration plants

Measured parameters

Ammonia (NH3)