Benzene Fenceline Monitoring

Benzene Fenceline Monitoring

The MAX300-AIR Environmental Gas Analyzer can measure fugitive benzene at < 0.6 µg/m3 (0.2 ppb).  Recent amendments to 40 CFR 60 and 63 have lowered the actionable level to 9.0 µg/m3 (2.8 ppb),  at this concentration Extrel mass spectrometers offer a real-time, fully automated solution with better than 99.9% accuracy.  

Air is pulled continuously from the sample points back to the MAX300-AIR for analysis. There is no need for personnel to manually collect samples, or send anything to an offsite lab, and real-time alerts of benzene transients are crucial for easily and accurately identifying the source.

For over 45 years Extrel has provided the very best support to industry for their environmental and emissions applications.  

MAX300-AIR Measurements

  • Fenceline Benzene Levels
  • Total sulfur
  • TWA Exposure Values
  • BTU (Energy content)
  • Explosive Limit Analysis


  • Quantitative analysis of individual contaminants
  • ppt detection limits
  • Analysis time in seconds
  • Multiport sample systems for total site monitoring
  • High precision and accuracy for safety and regulatory reporting
  • Low maintenance and calibration required

System Specs

Mass Range

  • 1-200, 300, 500 amu
Detectable Compounds
  • Any gas or vapor sample
Detection Range
  • 100% – 10 ppb standard, 10 ppt w/ membrane inlet*
Number of Sample Streams
  • 16, 31, 40, 80, 120, 160+
Analysis Rate
  • 0.4 Seconds per component
Number of Components
  • Unlimited
Number of Analysis Routines
  • Unlimited
Number of User Configurable Data Tags
  • Unlimited
Analysis Precision
  • ±0.25% Relative Standard Deviation**
  • ±0.5% Relative Standard Deviation**
  • Two, one active and one spare with automatic switchover
  • Minimal
  •  Manual or fully automated calibration and validation
19 mm High-transmission Quadrupole filter

*Matrix dependent. Documented on trace benzene in air

**Based on the analysis of 1% argon

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