Analyzer LaserGas™ III SinglePath O2


NEO Monitors LaserGas™ III SP oxygen analyzer (3rd generation) is specifically designed for service in hazardous areas. The analyzer consists of transmitter and receiver unit that are mounted diametrically opposite each other on stack, ducts or reactors. The laser will cross the process gas and concentration changes are detected in-situ and in real time. LaserGas™ III sets a new standard for fast and reliable Tunable Laser Absorption Spectroscopy analysis (TLAS). The laser scans the absorption line in milliseconds.

Technical data

Technical data

Detection limit (O2): 100 ppm **
Max. process gas temprature: 1500 °C
Max. process gas pressure: 8 bar abs
Optical path length: Typically 0,5 – 20 m
Repeatability: Application dependet 1% of range (gas& application spesific)

Environmental conditions
Operating temperature: -40 ºC to +65 ºC
Storage temperature: -40 ºC to +70 ºC
Protection classification: IP65

Inputs / Outputs
Analog output (3): 4 – 20 mA current loop (concentration and transmission)
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 Dry and oil-free pressurised air or gas, or by fan
Purge flow: 10-50 l/min (application dependent)
Calibration: Check recommended every 12 months

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

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 recevier unit (TU/RU): 215 mm (length, add 50 mm for purge unit) x 125 mm (diameter), 3,5 kg each
Window unit (optional): Wu 60 (length) Wu 100 (length) 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.

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, Pulp and paper plants, Semiconductor industry, The arms industry, Waste incineration plants, Water and sewage

Measured parameters

Oxygen (O2)