Fieldpiece AOX2 Oxygen and Carbon Dioxide Accessory Head

The AOX2 Combustion Check Accessory measures percent oxygen (%O2) and flue temperature and calculates percent carbon dioxide (%CO2). The AOX2 is an affordable alternative to full-function combustion analyzers. It's designed for techs who want to do everyday combustion testing and tuning, without paying for all of the costly extras found on combustion analyzers - extras they don't need or care about.

The AOX2 allows you to easily calibrate combustion equipment such as boilers or furnaces to the manufacturer’s specified % CO2, or % O2. Tuning the CO2, O2 stack temperature and temperature rise to match the appliance manufacturer’s specifications will increase efficiency and help maximize performance and life expectancy of the equipment. Tuning typically involves adjusting the air/fuel ratio.

How to use

1. Connect to COM and Volts jack. Slide AOX2 combustion check head onto Fieldpiece "stick" meter, data logger, electronic handle or connect to most other meters using Fieldpiece ADLS2 deluxe test leads or AHDL1 handle
2. Set meter to mVDC range.
3. Calibrate if needed (see Field calibration)
4. Clip the thermocouple to the snoot of the AOX2 pump using the included clips making sure to bend the bead tip (see photo) for optimum accuracy
5. Before inserting the AOX2 into the flue ensure that the water trap is securely fastened on the meter and that a clean filter is installed properly.
6. To purge the sensor and pump any left-over contaminants from the previous measurements pump uncontaminated air into the AOX2 for one minute before inserting it into the flue
7. Select fuel type being burned - OIL or GAS.
8. You must wait until the system you are testing has stabilized completely before you can take accurate readings of the flue gas. This means that the temperatures throughout the systems have stabilized and there is a steady flow of fuel in the furnace.
9. Disable Auto-off to data log any of the parameters with the DL2 data logger.
10. Once the system is stabilized and the AOX2 has been purged, insert the snoot into the flue gas. Select TEMP function and pump vigorous- ly until the temperature stabilizes (Usually under 2 minutes).
11. Now read temperature of the flue gas, %O 2 or %CO 2 directly on your DMM display by select- ing the appropriate switch position. Make sure to keep pumping and that the parameter you are reading is stable.