User's Manual

18 || G7 EXO TECHNICAL USER MANUAL
5.2 GAS SENSOR SETTINGS
Once you have completed a bump test (section 7.1) and calibration
(section 7.2), EXO is ready to monitor and notify you of gas exposures.
Low gas threshold reached (low gas)
When gas levels reach the low concentration threshold congured by
your safety supervisor, EXO will inform you with a yellow warning alarm.
The sounds and lights associated with the yellow warning alarm will
persist until gas concentrations return to safe levels.
NOTE: An EXO with an O2 sensor will trigger low warning alarms in
oxygen-decient and oxygen-enriched atmospheres. An oxygen-
decient atmosphere poses a risk of insucient oxygen for breathing.
An oxygen-enriched atmosphere presents an increased risk of
explosion.
High gas threshold reached (high gas)
When gas levels reach the high concentration threshold congured
by your safety supervisor, EXO will inform you with a red alert. The
sounds and lights associated with the red alert will persist until gas
concentrations return to safe levels.
NOTE: An EXO with an O2 sensor will trigger red alerts in oxygen-
decient and oxygen-enriched atmospheres. An oxygen-decient
atmosphere poses a risk of insucient oxygen for breathing. An oxygen-
enriched atmosphere presents an increased risk of explosion.
Sensor error
If a gas sensor stops working for any reason, EXO will inform you with
a yellow warning alarm. An X is displayed on EXO’s screen to indicate
the sensor in error. Power off and restart EXO. If the sensor error
persists, ensure the cartridge is installed properly. The cartridge may
need to be replaced.
Over limit (OL)
If gas concentration is higher than a sensor’s capability to detect, a red alert
will be triggered.
Under limit (UL)
It is possible for a senor to give negative readings. This is typically a
result of improper calibration, poisoning or cross-sensitivity to other
gases. If these negative readings become too low, the device will warn
the user by initiating an under limit warning.
The info banner will say “under limit” and the gas sensor will give a
reading of “UL”. This warning noties the user that the readings are
inaccurate. If this happens, a calibration will be required to ensure the
sensors are accurately detecting gas levels. If you are unable to perform
a calibration and are in a clean atmosphere, you can zero the sensors to
reset their baseline.
Bump test due
When gas sensors are due for a bump test, a warning will display in the
banner on the gas status screen. This is congurable on Blackline Live.
See section 7.1 for more information on bump tests.
Calibration due
When gas sensors are due for a calibration, a warning will display in the
banner on the gas status screen. This is congurable on Blackline Live.
See section 7.2 for more information on calibration.