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16. How to Calibrate Sensors
For best results, the calibration gas concentration should be as
close to the expected levels of emissions as possible. Because each
sensor is linear through a nominal range, one calibration gas
concentration can be used for a reasonably wide range of emission
levels. For applications with extremely low or extremely high levels of
emissions, the sensors should be calibrated as close as possible to
expected concentration levels. It is also recommended that—for gas
mixtures that support oxygen content—a small percentage of oxygen
(i.e. 2% - 5%) be present in the calibration gas to aid in the system
leak check.
Fully charge analyzer:
Place unit on charge the night before you plan to use analyzer to
ensure full charge of battery.
Initiate analyzer:
1. Attach T-gas thermocouple, sample line, and power cord.
2. Switch on analyzer.
3. Select Gas Analysis on main menu.
4. Select Fuel Type, press OK.
5. Select No for Data Processing.
6. Allow instrument to complete self-calibration/auto-zero sequence.
Perform air leak test:
1. Apply nitrogen gas to analyzer through probe/sample line (you can
use NO calibration gas that is balanced in nitrogen).
2. Allow gas to flow for 3 minutes.
3. After 3 minutes, check that O2 reading is 0.0% (+/- 0.2%). If
reading other than 0.0%, troubleshoot source of leak and correct.
To troubleshoot, check tubing, connections, and o-rings.
4. Do not proceed to calibrate analyzer until air leak is corrected.
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