Process Laser Gas Analyzer

A new measurement solution that contributes to improve productivity in petrochemical plant manufacturing processes*¹.

The PLGA-1000 Process Laser Gas Analyzer is designed to measure hydrocarbons and other gases contained in process gases at petrochemical plants. The PLGA-1000 uses proprietary technology to measure low concentrations of acetylene (C2H2) and carbon dioxide (CO2) contained as impurities in high concentration methane (CH4) and ethane (C2H6) which are material gases, continuously at high speed and with high sensitivity . This contributes to improvements in productivity, cost, and quality in the manufacturing process, as well as reducing environmental impact.

*1: Limited to specific manufacturing processes

Delivering New Benefits with Innovative Technology

HORIBA's proprietary IRLAM™ *¹ (InfraRed Laser Absorption Modulation) technology realizes new solutions for specific manufacturing process that have been difficult to achieve with process gas chromatograph measurements.


  Significant Improvement of Process Control With More Accurate and High-Speed Stable Continuous Gas Measurement

Continuous measurement of low-concentration impurity gas in high concentration hydrocarbons accurately in a short measurement time.

- High sensitivity measurement: ­ppb level (Low concentration impurities in high concentration hydrocarbons are measured at ppb level.)

-­­ Fast response time: 3 seconds (for details, see response time in specifications)


 Operational Cost Reduction

A column-free gas analyzer that uses IRLAM technology. Furthermore, the frequency of replacement parts and calibration is reduced by using a laser as the light source.


 Compact Installation Area

 The use of a small gas cell (Herriot cell), etc. reduces the footprint of the analyzer and contributes to save your space.


Measurement Principle

 HORIBA’s Proprietary IRLAM Technology

HORIBA's proprietary IRLAM technology consists of three new technologies with distinctive features. These key components are developed and produced in-house which allows us to address to diverse customers' needs.



Click here for further details about IRLAM Technology.

*¹ IRLAM is a registered trademark or trademark of HORIBA Ltd. in Japan and other countries.

NameProcess Laser Gas Analyzer
Measurement principleNDIR: Non Dispersive Infrared
Light sourceQCL: Quantum Cascade Laser
Laser classClass 1(IEC 60825-1:2014)
ComponentsMethane ( CH), Ethane ( C2H6 ), Acetylene ( C2H2 ), Carbon Dioxide ( CO2 )    
Range*¹CH4   : 0 - 2000 ppm or 0 - 5 vol%
C2H: 0 - 50 vol%
C2H: 0 - 50 ppm
CO2   : 0 - 200 ppm
Repeatability±1.0 % full scale
Linearity±1.0 % full scale
Response timeTd + T90 : 3 sec at flow rate of 1.6L / min
ZERO drift±2.0 % full scale per 1 month
SPAN drift±2.0 % full scale per 1 month
Data update cycle1 sec
Calibration interval1 month
Ambient temperature-10˚C to 50˚C or -10˚C to 45˚C
(no direct sun rays, including case temperature influences due to radiant heat and heat conduction)
*The flow rate of the protective gas differs depending on the specification of the ambient temperature
Protection classIP66、NEMA4X
Hazardous area
US, Canada: Class I, Division 2, Groups A, B, C, D T4
US: Class I, Zone 2, AEx pzc IIC T4 Gc
IECEx, Canada: Ex pzc IIC T4 Gc
ATEX, UKCA:    II3G Ex pzc IIC T4 Gc
Wetted materialsSS316, SS304, BaF2, FKM, PTFE, Au, Ni
Gas connector size1/4"NPT, 1/2"NPT (Option: N2 generator)
Pressure error alarm
Three channels (Main enclosure, Optical unit, Cell)
DC 5 V to 24 V, 1 A at each terminal
Communication functionModbus®/ TCP 
Analog outputFour channels (Gas concentration)
4 mA to 20 mA
Max. load: 550 Ω
Contact outputThree channels (Calibration / Main alarm / Measurement)
Relay contact output (isolated output)
DC 5 V to 24 V, 1 A at each terminal
Digital outputOne channel (For signal barrier power control relay)
DC 24 V, 100 mA
Dimension664 mm (W) x 270 mm (D) x 704 mm (H)  *Protrusions included
WeightStandard 46 kg, Max. 50 kg  *Depends on product specifications
Power supplyAC 100 V to 120 V, 50 Hz/60 Hz or AC 200 V to 240 V, 50 Hz/60 Hz
Power consumptionMax. 250 VA

*¹ Please contact us for other components.

Modbus is a trademark of Schneider Electric USA Inc.

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