Gas monitoring
https://www.emerson.com/en-us/catalog/automation-solutions/measurement-instrumentation/flame-gas-detection/rosemount-sku-928-wireless-gas-monitor
https://www.emerson.com/en-us/catalog/rosemount-sku-628-toxic-gas-sensor
https://www.emerson.com/en-us/catalog/rosemount-sku-6888a-in-situ-oxygen-analyzer
http://www.haakon-rygh.com/fakta-om-gass/metoder-for-maling/
https://www.servomex.com/gas-analyzers/technologies