3. If you are not zeroing O
2
, Click NO in the prompted message: Is this a CO
2
unit?. Zero
results are displayed. Press the button or wait for six seconds to end the Zeroing process.
4. Click Yes if this is a CO
2
unit and you want to apply Nitrogen to zero CO
2
. A two minutes
gas measure process starts automatically. All current gas measurements and entries reset
to zero are displayed.
5. Turn off the gas following on-screen instructions. Zero results are displayed.
6. Press the button or wait for six seconds to end the Zeroing process.
Zero results are displayed as follows:
l
A check mark for sensors that passed Zero
l
A cross mark for sensors that failed Zero
l
An exclamation mark for sensors that skipped Zero
Acknowledge Alarms and Messages
Press and release the button to perform any of the following:
l
To acknowledge a latching alarm
l
To acknowledge a low alarm
l
To acknowledge due today message (for example, calibration and bump test reminders).
Note that the force calibration and force bump test features cannot be bypassed.
Latching Alarms
If enabled, during an alarm condition the Latching Alarms option causes the low and high gas
alarms (audible, visual, and vibrator) to persist until the alarm is acknowledged and the gas
concentration is below the low alarm setpoint. The LCD displays the peak concentration until
the alarm no longer exists. Local regulations in your region may require the Latching Alarms
option be enabled.
The detector is shipped with the Latching Alarms option disabled.
Bump Test
Perform a bump test regularly to test sensors and alarms. To bump test, expose the sensors to
a gas concentration that exceeds alarm setpoints and confirm that the sensors and alarms
work correctly.
The detector can be bump tested in two ways:
l
Apply gas from a cylinder to the sensors manually through the pump inlet.
l
Use an IntelliDoX® module.
BW Ultra 25 User Manual
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