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LaserGas III 2

LaserGas III Open Path HF Gas Detection

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NEO TDL LaserGas III Open Path Detection

The TDLS Open Path Solution

NEO Monitors LaserGas III new HF Open Path Gas Detector is specifically designed for service in hazardous areas.
Based on our third generation LaserGas Technology, the entire instrument is built into compact flameproof enclosures making it fit for zone 1 applications. The LaserGas III HF OP consists of a transmitter and receiver unit that is mounted diametrically opposite each other at distances up to 100 meters. The laser light is sent from the transmitter to the receiver and any HF concentration changes along the optical path from the transmitter to the receiver are detected in real-time.


  • Generation 3 compact LaserGas Technology
  • For operation in zone 1 (Explosion proof, Ex-d)
  • Automatic health check
  • Low power < 15 Watt
  • No need for regular replacement of parts
  • No interference from other gases
  • Factory calibrated, no zero drift
  • Suitable for SIL2


Open Path monitors are critical in emission monitoring across a wide range of industrial applications:

  • Oil and gas industry
  • Petrochemical refineries
  • Chemical plants
  • Metal industry
  • Fenceline monitoring

 Customer Benefit

Compact high performance gas monitor for ambient long distance monitoring

  • No cross interference from other gases
  • Easy to install
  • Limited need for maintenance
  • Low cost of ownership
  • Proven and reliable


Type:  Near IR Diode Laser Spectroscopy
IR-source: Diode laser Class1 M, eye safe
Detected gas: HF 
Range:  Minimum 0-5 ppm*m 
Path lenght: 5-100 m 
Self-test:Calibration: Continuous Factory set, no field calibration necessary 
Zero:  <+/- 1% of full scale 
Repeatability: Response time:  <+/- 1% of full scale 5 sec (adjustable) 
Optics Alignment:  +/- 0.15 deg 
Obscuration:  > 90% 
Output signals   
Standard:  4-20 mA source or sink, 
  max load impedance 
  500 Ohm 
Options:  Ethernet 
Fault signals:  Fault 1mA 
  Beam Block 2 mA 
  Warning 3 mA 
Power Supply:
Power consumption: 
24V DC range 18-32V DC < 15W 
Temperature range   
Storage temperature:
-55 °C to 75 °C
-40 °C to 65 °C
Humidity (operational):  100% RH 
Material TU and RU:  Stainless steel 
  (ASTM 316) 
Dimensions / weight   
Footprint/weight:  Ø 125mm x 250 mm/ 
  5.5 Kg (12 lbs.) per TU or RU
Visual inspection:  Recommended every 6 – 12 months
  (no consumables needed)
Calibration:  Check recommended every 12 months
Approvals ATEX zone 1: (TU/RU)  II 2 G Ex d [op is] IIC T6 II 2 D Ex tb IIIC T88 °C 
Ingress:  IP66/IP67 IEC 60529 
SIL:  Suitable for use in SIL2 systems 

 subject to change without notifications



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