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Ammonia (NH3)

Exposure limits for NH3

  • US OSHA PEL:
    • TWA = 50 ppm
  • US NIOSH REL:
    • 8 hr. TWA = 25 ppm
    • 15 min. STEL = 35ppm
  • TLV:
  • 8 hr. TWA = 25 ppm
  • 15 min. STEL = 35 ppm
Exposure limits

Different types of ammonia sensors have different limitations!

  • The secret to choosing and installing a trouble free system is understanding the limitations of the sensors
  • Critical to specify the correct sensors for the locations and conditions in which they will be operated
limitations
limitations

Key factors in NH3 sensor selection

  • Understand the environmental factors for each location
  • Establish the environmental AND detection requirements:
    • Temperature range of the application
    • Detection range required
    • Typical gas concentrations!
    • Background gases present (cleaning solvents, process gases, and other compounds)
    • Make sure you have all the information to provide the best solution

Choosing the right NH3 sensor for the application

  • Issues that can affect the choice of sensors:
    • Continuous or high exposure levels
    • Cross sensitivity