A combustion analyzer detects a plethora of flue gas metrics including oxygen (O2), carbon dioxide (CO2) and carbon monoxide (CO) concentrations as well as stack temperature and draft. The ability to rate the concentrations of these gases and provide accurate feedback is crucial for any technician working on fossil fuel heating systems or appliances. It is also critical for finding and repairing gas leaks, identifying hazardous conditions as well as performing adjustment tasks.

A typical combustion analyzer consists of a gas sample probe, micro-pump and sensor assembly. The probe draws a gas sample from the appliance or engine and passes through a water trap and filter assembly to condition the sample so it arrives in acceptable form to the sensors. This ensures the sensors are exposed to an environment that is matched as closely as possible to the ambient air in order to get accurate readings.

Understanding Combustion Analyzers: How They Work and Why They’re Important

The sensors are then analyzed and the results displayed on the display screen. Most models present oxygen concentrations in % as well as CO and CO2 concentrations in ppm. Other important metrics are displayed including efficiency, excess air, combustion performance and draft pressure.

Combustion analyzers come in a variety of brands and price points. All can be used for a similar purpose, however, the quality of the product makes a difference in terms of cost of ownership as well as ease of use and durability. Like a vehicle, combustion analyzers require service, calibration, cleaning and consumable parts. When these costs are added up, owning an analyzer can quickly become expensive if the unit is not used properly. Like a car or truck, if you don’t take care of it it will break down.