OxyFire Sensors: Typically used in a coal-fired power boiler, the high temperature, in-situ oxygen sensor is generally installed in the boiler water-wall, above the nose arch and above each of the burner banks. This configuration allows the boiler operators to center the fireball in the radiant zone and "balance" the boiler.

Typically installed above the slag line, the sensors give the boiler operators a unique perspective on the combustion process, eliminating the typical "air infiltration" that confuses "low temperature" sensors located in the back pass.

Benefits from using Marathon Monitors' Combustion Optimization System to "trim" the draft are:

• Balanced boiler - Centering the fireball
• Minimizing NOx formation
• Reduces over-all maintenance costs

LOROX Sensors: Typically used in fossil fuel fired power boilers where the slag line is very high. These sensors are often installed in the back pass section where temperatures are too low for Oxyfire sensors to operate. Response time is still very fast and the LOROX is easily maintained without removal.