Ammonia (NH3)
Exposure limits for NH3
- US OSHA PEL:
- US NIOSH REL:
- 8 hr. TWA = 25 ppm
- 15 min. STEL = 35ppm
- TLV:
- 8 hr. TWA = 25 ppm
- 15 min. STEL = 35 ppm
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
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