User's Manual

G7 EXOTECHNICAL USER MANUAL || 23
Calibration process,
1. EXO will run an audio/visual self test. See section 3.6 for more information.
2. A screen will prompt you to zero the sensors. Ensure all the gas
sensors you wish to calibrate are checked. By default EXO will zero
all sensors.
3. Select Start zeroing
4. All checked sensors will be zeroed in preparation for their calibration.
This will take a few seconds.
5. 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
checked. By default EXO will attempt to calibrate all sensors that
have been successfully zeroed.
6. Select Start span
7. EXO will begin to count down from 60 seconds. Within this time window:
• Attach tubing tted with a quick connect coupling insert to EXO’s
manual calibration inlet
• Ensure the other end of the tubing is attached to the xed ow
regulator on the gas cylinder
• Turn on the gas regulator and apply the gas, keep gas owing
8. Turn gas o when prompted on EXO’s screen
9. You will be prompted to go through steps 5-8 until all zeroed
sensors have been calibrated. The calibration process is only
considered successful once all the sensors have been calibrated.
10. 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.
11. EXO will let you know if the calibration has passed or failed and
when the next calibration is due
12. Remove the tubing from the manual calibration inlet and let EXO sit
until the gas readings stabilize
If you see a calibration fail message on G7 EXO’s screen,
 Check the gas and cylinder connections
 Check that cylinder gas concentrations match the EXO calibration
gas conguration
 Let EXO sit until its gas readings stabilize
 Try the calibration again
 If the calibration continues to fail, contact your organization’s
safety supervisor.
7.3 ZEROING SENSORS
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. You may need to zero or
calibrate the sensor.
EXO’s sensors can be zeroed manually. EXO can be congured to zero
its sensors automatically on startup and they are also zeroed as a part
of the calibration process. Contact your safety supervisor to learn more
about how EXO’s features are congured.
NOTE: The LEL-MPS sensor will auto-zero at startup. This is not
congurable. See section 7.4 for more information about LEL sensors.
MANUALLY ZERO SENSORS
You can zero a sensor by using the atmosphere to reset the sensor’s
baseline reading. Inert purge gas may also be applied to the manual
calibration inlet to zero sensors.
SAFETY WARNING: EXO’s sensors must only be zeroed with clean air. If a
sensor is zeroed where its targeted gas levels are abnormal, the gas levels
EXO displays will not be accurate. Inaccurate readings are a safety hazard.
Zeroing process,
1. Ensure G7 EXO is in clean air
2. Press the OK button to enter the main menu
3. Select Gas options
4. Select Zero sensors
5. A screen will prompt you to zero the sensors. Ensure all the gas
sensors you wish to zero are checked.
6. Select Start zeroing
NOTE: Do NOT apply gas
7. EXO will let you know when the zeroing is completed
If you see a zero incomplete message on G7 EXO’s screen,
 EXO may be in an environment with abnormal gas levels
 EXO’s cartridge may need to be replaced
Manual calibration
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