RK Griffith principals/products in this category:
Rosemount - O2 & CO analyzers; opacity meters; pressure, temperature & flow transmitters
Fireye - Flame scanners
Testo - Portable emissions analyzers
Syn-Fab - High temperature furnace camera systems
Emerson Flame & Gas Safety - Fixed point gas detectors, open path gas detectors, ultrasonic gas leak detectors, gas & smoke aspirator systems