For the past several weeks we've been discussing how to select a continous solvent vapor analyzer to meet NFPA 86 requirements, specifically focusing on the 6 essentials necessary to do so:
- Sample delivery system. 220.127.116.11
- Speed of Response. 18.104.22.168
- Accurate calibration and response 22.214.171.124
- Avoidance of condensation.126.96.36.199
- Failsafe malfunction logic. 188.8.131.52
- Maintenance. 184.108.40.206
After careful review of these reqirements, we can surmize the following (concerning the possible sensor choices):
- Catalytic sensors are not recommended for continuous solvent vapor monitoring.
- Infrared sensors are not recommended except in applications where a single solvent is being used.
- Flame ionization (FID) sensors are not recommended for LFL monitoring. They are more appropriate for measuring lower ppm concentrations in the exhaust of VOC reduction systems.
- To date, the only FM approved sample- delivery and solvent vapor monitoring systems meeting all NFPA 86 requirements are Flame Temperature Analyzers.