This sensor utilizes absorption spectroscopy to determine SO2 and NO2 and infrared spectroscopy for CO2 combined into a compact sensing head. The radiation sources for both UV and infrared are LEDs, the emitted radiation being transmitted down the in-situ probe to a measurement cell into which the flue gas diffuses. The degree of absorption of the UV and IR beams reflected into the sensor is measured to provide an accurate determination of the concentrations of the three gases SO2, NO2 and CO2. The use of LEDs for the light sources enables the sensor unit to be very compact and robust, with no moving parts, thus requiring zero maintenance.

Accuracy is maintained by an integral zero calibration system where ambient air is delivered to the measurement cell by a small internal diaphragm pump. To ensure zero accuracy of the CO2 measurement the zero air is scrubbed clear of CO2 by passing it through a disposable filter unit, which is quickly and easily replaced after a minimum two-year operation. This is the only maintenance requirement for the analyzer.

Service requirements are minimal, limited to electrical power 36V DC at 50VA. Output is via RS485 serial digital comms. Power and comms are delivered by a single 4-way sealed connector.

Key Features

• IN-SITU CEMS suitable for Refineries, Power Plants & other industries
• Measurement gas resolution 1 PPM and accuracy +/-2% of reading
• Specifications at par with current Refinery specifications
• Safe Area/Hazardous area available
• UV absorption spectroscopy based SO2 & NO2 measurement, Laser (QCL) based NO & H2O measurement and infrared spectroscopy-based CO2 measurement
• 24 VDC power supply operated
• Remote monitoring of the system is available
• Simple installation
• Light weight and easy to install
• Low maintenance
• No shelter required