Combustion control is done by applying a setpoint. It is generally expressed in O2% excess in fumes. This measurement is key and must comply with several required features:

• Short response time
• Relevant in situ oxygen measurement
• Easy & straightforward maintenance – long lifetime
• Analyzer calibration
• Veracity & confidence of the measurement:
  • Gas checking – at the analyzer’s level – checking of the analyzer value
  • Displayed value at transmitter’s level – checking of remote communication value