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Calibration

Manual Calibration

For a manual calibration, you need:

  • A cylinder or cylinders containing the appropriate gases

  • A 0.5 LPM (or 1 LPM for Cl2, HCN, NO2, NH3, SO2, or H2S) fixed-flow regulator attached to the cylinder(s)

  • A tube fitted with a quick connect coupling insert

Note:

If you are calibrating EXO Diffusion in a windy environment, you must use the wind guard. See the Using the Wind Guard section for more information on using the wind guard.

  1. Ensure EXO is in clean air.
  2. To navigate directly to Calibration from the Home screen, use the left and right buttons to scroll, then press the center button to select Days To Calibrate. Skip to step 3.

    Or to navigate to Calibration from the Main menu, open the Main menu.

    Select Gas options.

    Select Calibration.

    A screen listing the configured calibration settings opens, followed by a screen that displays, "Continue with calibration?"
  3. Select . EXO runs an audio/visual self test. See the Alarm Test section for more information.
  4. When prompted, ensure the gas sensors you wish to calibrate are selected. By default, EXO zeroes all sensors.
  5. Select Start zeroing.
    Selected sensors are zeroed in preparation for their calibration. This takes a few seconds.
  6. When prompted, ensure the gas sensors you wish to calibrate with the chosen gas cylinder are selected. By default, EXO tries to calibrate sensors that have been successfully zeroed.
  7. Select Start span.
  8. EXO begins to count down from 60 seconds. Within this time window:
    1. Attach a tube fitted with a quick connect coupling insert to EXO's manual calibration inlet.
    2. Ensure the other end of the tube is attached to the fixed-flow regulator on the gas cylinder.
    3. Turn on the gas regulator to apply the gas.
  9. Turn the gas off when prompted by EXO.
  10. Follow the prompts to go through steps 8 to 9 until all zeroed sensors are calibrated. Calibration is only considered successful when all the sensors are calibrated.
  11. When prompted, press the center button to complete the calibration. This screen times out after a few seconds. EXO displays a pass or fail message and when the next calibration is due.
  12. Remove the tube from the manual calibration inlet and let EXO sit until the gas readings stabilize.

If EXO displays a "Calibration fail" message:

  • Check the gas and cylinder connections.

  • Check that cylinder gas concentrations match EXO calibration gas configuration.

  • Let EXO sit until its gas readings stabilize.

  • Try the calibration again.

If the calibration continues to fail, contact your organization’s safety supervisor.

If you know EXO is in a clean atmosphere and a gas sensor is reading abnormal levels, this can mean the sensor’s baseline has shifted and EXO’s displayed gas readings are not accurate. Try calibrating the sensor. If the sensor is still reading abnormal levels, you may need to zero the sensor.

EXO

Last updated: January 27, 2026