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Lasergas II Hydrogen

NEO LaserGas™ II Hydrogen

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NEO TDL Open Path Detection LaserGas II

NEO Monitors LaserGas™ is using Tuneable Diode Laser Absorption Spectroscopy (TDLAS) i.e. a non-contact optical measurement method employing solid-state laser sources. The sensor remains unaffected by contaminants corrosives and does not require regular maintenance. The absence of extractive conditioning systems further improves availability of the measurements and eliminates errors related to sample handling. The monitor is mounted directly onto flanges, which include purge gas connections and a tilting mechanism for easy alignment. Continuous purge flow prevents dust and other contamination from settling on the optical windows. Once power and data lines are connected, measurements are performed in real-time.


  • Fast response time
  • No gas sampling: In-situ measurement
  • No interference from background gases
  • Applicable for many process conditions:
    • high/low temperature
    • high dust
    • corrosive gases
  • Line measurement, integral concentration over the full stack diameter
  • Integrated span check option
  • Suitable for harsh environment
  • No zero drift
  • Stable calibration
  • Continuous internal health check


LaserGasTM II SP is designed for reliable and fast measurement of all kinds of gases in any environment, most typically:

  • Chemical industry
  • Petrochemical industry
  • Metal industry
  • NG processing
  • Chlorine production
  • Safety applications
  • PVC production
  • Process control
  • Glass production


  • In-situ monitoring
  • Highly reliable real time analyser
  • Low maintenance cost
  • Reduce emission to the environment
  • Easy to install and operate
  • Reduce daily operation costs
  • Optimize process
  • Well proven measurement technique


Optical path length:

Typically, 0.7- 5m


Application dependent


2% of range (gas & application dependent)

Environmental conditions


Operating temperature:

-20 ºC to +55 ºC (special version up to +65 ºC on request)

Storage temperature:

-20 ºC to +55 ºC Protection classification: IP66

Inputs / Outputs


Analog output (3):

4 - 20 mA current loop (concentration, transmission)

Digital output:

TCP/IP, MODBUS, Optional fibre optic

Relay output (3):

High gas, Maintenance Warning and Fault

Analog input (2):

4 – 20 mA process temperature and pressure reading



Input power supply unit:

100 – 240 VAC, 50/60 Hz, 0.36 – 0.26 A

Output power supply unit:

24 VDC, 900 – 1000 mA

Input transmitter unit:

18 – 36 VDC, max. 20W

isolated Relay output:

4 – 20 mA output: 500 Ohm max.



Laser class:

Class 1 according to IEC 60825-1




Conformant with directive 2014/30/EU



IECEx/ATEX zone 1:


Laser zone 1:


IECEx/ATEX zone 2:


Laser zone 0:


Installation and Operation


Flange dimension alignment:

DN50/PN10 or ANSI 2’’/150lbs (other dimensions on request)

Alignment tolerances:

Flanges parallel within 1.5°

Purge flow:

Dry and oil-free pressurised air or nitrogen 10 - 50 l/min (application dependent)



Visual inspection:

Recommended every 6 – 12 months


Check recommended every 12 months Validation: In-situ span check with internal cell

Dimension and weight


Transmitter unit:

405 mm (plus 65 for purge unit) x 270 mm x 170 mm, 6.2 kg

Transmitter unit:

405 mm (plus 65 for (Ex version) purge unit) x 270 mm x 310 mm, 7.9 kg

Receiver unit:

355 mm (plus 65 for purge unit) x 125 mm x 125 mm, 3.9 kg

Power supply unit:

180 x 85 x 70 mm, 1.6 kg




Detection limit (%Vol)

Min range (%Vol)

Max range (%Vol)

Response time (sec)

Max temp (oC)

Max pressure (BarA)



0 -5

0 - 100




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