Hydrogen Fluoride (HF)

TAS is the expert in designing, integrating and maintaining HF detection systems. Boasting over thirty open path HF detection systems currently in use, TAS has the expertise, credentials, and understanding required to monitor even the toughest gas monitoring challenges.


When anhydrous or highly concentrated HF is released into the atmosphere it forms a very dense plume. This is the result of a number of chemical interactions including reactions with water and agglomeration of HF molecules into semi-stable oligomers or droplets. Often this results in released HF plumes behaving as a dense gas. They will move as if it is heavier than air, sloughing toward the ground. However, the HF molecule is lighter than air. As HF agglomerates or droplets break apart the HF gas behaves as a lighter than air gas and begins to loft.

Highly dense plumes of any type can block open path optical sensors. The density of an HF plume depends on the concentration of the release and the atmospheric properties at the time of release (temperature, humidity, wind speed, turbulence). Conditions of HF releases require advanced knowledge of the behavior of HF plumes and the phases of plumes within the varied geometric spaces of an industrial environment.

Typical Applications

  • Fenceline Monitoring
  • Open Path Monitoring
  • Point Source Monitoring
  • Health and Safety Monitoring

Typical Industries

  • HF Alkylation Units
  • Semiconductor Manufacturing
  • Metals Manufacturing
  • Fertilizer Manufacturing
  • Plastics Manufacturing
  • Refrigerant Use and Manufacturing