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Calibration

Manual Calibration

For a manual calibration, you will 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 Wind Guard for more information on using the wind guard.

  1. Ensure EXO is in clean air.
  2. Press the OK button to enter the main menu.
  3. Select Gas options.
  4. Select Calibration. A screen listing the configured calibration settings will open, followed by a screen that says, “Continue with calibration?”.
  5. Select Yes. EXO will run an audio/visual self test. See Alarm Test for more information.
  6. A screen will prompt you to zero the sensors. Ensure all the gas sensors you wish to calibrate are selected. By default, EXO will zero all sensors.
  7. Select Start zeroing. All selected sensors will be zeroed in preparation for their calibration. This will take a few seconds.
  8. A screen will prompt you to select a gas mix. Ensure all the gas sensors you wish to calibrate with the chosen gas cylinder are selected. By default, EXO will attempt to calibrate all sensors that have been successfully zeroed.
  9. Select Start span.
  10. EXO will begin 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.
  11. Turn the gas off when prompted by EXO.
  12. You will be prompted to go through steps 8 to 11 until all zeroed sensors have been calibrated. Calibration is only considered successful when all the sensors have been calibrated.
  13. If all sensors have been successfully calibrated, you will be prompted to press the OK button to complete the calibration.
    This screen will timeout after a few seconds. EXO will let you know if the calibration has passed or failed and when the next calibration is due.
  14. Remove the tube from the manual calibration inlet and let EXO sit until the gas readings stabilize.

If you see a "Calibration fail" message on EXO’s screen:

  • Check the gas and cylinder connections.

  • Check that cylinder gas concentrations match the 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.

G7_EXO

Last updated: January 27, 2026