O2NE+ & Safe-Ox+
User Manual
Int. Approved
Document ref: P0120-820-14
August 2017
Page 12 of 23
Commercial in Confidence
5
Operation
5.1
Normal operation
When the Ax
O2NE+™/Safe-Ox+™ is turned on it will take approximately 10 seconds to start-
up. During this period, the 'Good/OK' and 'Fault' status indicators will be turned on. After the
initial start-up period has expired, the 'Fault' status indicator will turn off. The 'Good/OK' status
indicator will be illuminated and flash off briefly every few seconds, indicating normal operation.
The status indicators on any alarm repeaters will mimic this operation. On display models the
display will briefly read ‘8.8.8.8’ on power up before reverting to the O2 reading.
Note:
The instrument should be allowed to settle for a period of 2 hours before sensor readings
stabilise.
Momentarily pressing the 'Mode' button on either the Ax
O2NE+™/Safe-Ox+™ or any alarm
repeaters, in the absence of any alarm conditions, causes an alarm test to be performed. The
indicator lamps will flash 4 times and the buzzer will sound.
In all circumstances the alarm repeater will mimic the status indications and buzzer of the main
unit.
Units fitted with relays are configured such that relays may operate in conjunction with Alarm1
or Alarm2. By default they are set to be energised in the absence of alarms, and de-energised
in the presence of alarms. They may be factory configured in the opposite sense if required.
5.2
Alarm indications
5.2.1
Ax Safe-
Ox+™
If the Ax Safe-
Ox+™ detects an O2 concentration which is greater than the high alarm level,
then the 'Alarm 1' indicator will begin to flash and the buzzer will sound at its slow speed.
If the measured concentration of O2 falls below the low alarm level, then the ‘Alarm 2' indicator
will begin to flash and the buzzer will sound at its medium speed.
On standard units the alarms are self-cancelling when the O2 concentration returns to a level
within the alarm thresholds. Alternatively, latched alarm versions are available, on which the
alarm conditions will be maintained until the ‘Mode’ switch has been pressed to accept the
alarm, and the gas concentration has returned to a level within the alarm thresholds.
5.2.2
Ax
O2NE+™
If the Ax
O2NE+™ detects an O2 concentration which is less than the first alarm level, then the
'Alarm 1' indicator will begin to flash and the buzzer will sound at its slow speed.
If the measured concentration of O2 continues to fall below the second alarm level, then the
‘Alarm 2' indicator will begin to flash and the buzzer will sound at its medium speed. The 'Alarm
1' indicator will continue to flash.
On standard units the alarms are self-cancelling when the O2 level rises above the alarm limits.
Alternatively, latched alarm versions are available, on which the alarm conditions will be
maintained until the
‘Mode’ switch has been pressed to accept the alarm, and the gas level has
risen above the alarm threshold.
