ANALOX O2NE+ User manual

Analox Limited
15 Ellerbeck Court, Stokesley Business Park,
North Yorkshire, TS9 5PT, UK
T: [phone] F: [phone]
W: www.analox.net E: [e-mail]
O2NE+ &
Safe-Ox+
User Manual
THIS IS A PRECISION DEVICE!
•KEEP UP RIGHT
•ALLOW 2 HOUR WARM UP
•DO NOT SHOCK OR DROP
Commercial in Confidence

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User Manual Int. Approved
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List of contents
1Safety information ...............................................................................................................2
2Package contents checklist.................................................................................................4
3Overview..............................................................................................................................5
3.1 Partial pressure sensor...............................................................................................5
3.2Setup...........................................................................................................................5
4Installation of the product ....................................................................................................6
4.1 Removal of warning label from display.......................................................................6
4.2 Wall mounting.............................................................................................................6
4.3 Wiring installation........................................................................................................7
4.4 AC supply models.......................................................................................................7
4.5 DC supply models.......................................................................................................7
4.6 Alarm repeaters ..........................................................................................................8
4.7 Alarm relay output models....................................................................................... 10
4.8 Relay wiring ............................................................................................................. 10
4.9 4 to 20mA output models......................................................................................... 10
5Operation.......................................................................................................................... 12
5.1 Normal operation..................................................................................................... 12
5.2 Alarm indications ..................................................................................................... 12
6Maintenance..................................................................................................................... 13
6.1 Oxygen cell replacement......................................................................................... 13
6.2 Calibration adjustment............................................................................................. 14
6.3Alarm checks........................................................................................................... 15
6.4 Proof test ................................................................................................................. 16
6.5 Adjusting alarm set points........................................................................................ 16
6.6 Fault conditions........................................................................................................ 17
7Specifications ................................................................................................................... 18
8Disposal............................................................................................................................ 19
9Declaration of conformity.................................................................................................. 20

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User Manual Int. Approved
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1 Safety information
Every gas monitor installation should be risk assessed. The correct location of monitor(s) must
consider the potential sources of gas leaks and the location of expected human occupation in
the area. Where large areas must be monitored, it is often advised that no single monitor
should cover a volume in excess of 80m3. The installation of more monitors should be
considered where an area is complex in shape, filled with obstacles, has a lack of ventilation or
air circulation, or if there are dead zones where gas can collect
The Ax O2NE+™/Safe-Ox+™ is designed to be compliant with the following standards:
EN61010-1: 2001, IEC61010-1: 2001. It is designed to be safe at least under the following
conditions.
1) Indoor use
2) Altitude up to 1800m
3) Temperature 0°C to +40°C
4) Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 50%
relative humidity at 40°C.
5) Mains voltage supply fluctuations not to exceed 10% of the nominal voltage
6) Impulse withstand (over-voltage) category II of IEC 60364-4-443
7) Pollution degree 2
8) Mains voltage:-
a. 230V AC (Not adjustable - Instrument will be factory set)
b. 110V AC (Not adjustable - Instrument will be factory set)
c. 24V DC (Not adjustable - Instrument will be factory set)
9) Mains power:-
a. Less than 5VA –110V AC and 230V AC versions
b. Less than 5W –24V DC version.
10) Mains frequency - 50/60Hz
11) The remote alarm repeater has ingress protection to IP43: direct sprays of water up to
60° from the vertical in accordance with EN 60529:1991 + A1. All other units have
ingress protection to IP65: low pressure water jets from all directions and totally
protected from dust in accordance with EN 60529:1991 + A1.
12) Insulation: - Reinforced insulation, class II product according to IEC536.
13) Not for use in corrosive or explosive atmospheres
14) Not approved for use in vehicles, ships or aircraft
Fuse ratings:-
230V AC, 500mA, F rating 250V (20mm x 5mm glass cartridge)
110V AC, 500mA, F rating 250V (20mm x 5mm glass cartridge)
9-24V DC, 200mA, AS rating 250V (20mm x 5mm glass cartridge)

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4 to 20mA (or 0-1V) Output:-
External connected equipment must meet the requirements for reinforced insulation or must be
a Safety Extra Low Voltage (SELV) circuit as defined in IEC60950-1.
The above statement refers to the risk of externally connected equipment introducing
hazardous voltages into the A50™(O2NE+™, Safe-Ox+™or CO Clear™). It is the
responsibility of users of this product to ensure that their equipment/accessory is safe before
connecting it.
NOTE - If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
NOTE - The O2NE+™and Safe-Ox+™range of instruments are precision instruments and
therefore are susceptible to shock. Care should be taken when installing your O2NE+™or
Safe-Ox+™to avoid instrument damage.

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2 Package contents checklist
On receipt of the Ax O2NE+™/Safe-Ox+™please check you have the following:
1) Ax O2NE+™/Safe-Ox+™ main unit and alarm repeater
2) User manual
3) Test certificate
4) Rawl plugs and screws for wall mounting
5) Drilling template
Any optional items ordered such as:
1) Additional alarm repeater’s each with 8 metres of interconnecting cable.
2) Relay junction box

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3 Overview
Two variants of this product are available. The Ax O2NE+™ O2 detector is designed to detect
the presence of low oxygen in ambient air.
The Ax Safe-Ox+™ O2 detector is designed to detect the presence of high and low oxygen in
ambient air.
Instrument Name
Application
Sensor Type
Ax O2NE+™
Fixed instrument configured as standard with two
depletion alarms, representing warning (19.5%)
and danger (18%) levels of oxygen
Partial pressure
Ax Safe-Ox+™
Fixed instrument configured as standard with two
pre-set alarm levels at 23.0% and 19.5% O2
Partial pressure
3.1 Partial pressure sensor
This type of sensor measures the partial pressure of oxygen in the atmosphere where the
instrument is located. Therefore it is directly affected by fluctuations in atmospheric pressure.
To counteract this, a pressure compensation sensor is used to compensate for changes in
atmospheric pressure.
The oxygen sensor used is not cross sensitive to helium so will measure correctly in the
presence of a helium atmosphere. This means that the sensor can be safely used to detect
oxygen displacement by helium gas leaks. Care should be taken however, if the Ax
O2NE+™/Safe-Ox+™ is to be permanently exposed to a helium environment, as this can affect
the performance of the pressure compensation sensor over time. Contact Analox for installation
advice if you intend to use the unit in this way.
3.2 Setup
Different versions of the instrument allow operation from
1) 210/250V AC supply
2) 110/120V AC supply
3) 9-24V DC supply
The Ax O2NE+™/Safe-Ox+™ is intended to be used as a permanent installation. It provides a
digital readout of oxygen, plus audible and visual alarms to potentially dangerous deficiencies
(and abundancies in case of Ax Safe-Ox+™) of oxygen in the air surrounding the instrument.
The instrument uses an electrochemical cell together with state of the art technology, built in
an IP65 splash proof housing and is designed to provide long, trouble free service, with
minimum maintenance.
The Ax O2NE+™ has two pre-set alarm levels at 19.5% and 18% O2. The alarms are set with
a small hysteresis which means the O2 concentration has to rise above the alarm set point
before the alarm will cancel.
The Ax Safe-Ox+™ has two pre-set alarm levels at 23.0% and 19.5% O2. The alarms are set
with a small hysteresis which means the O2 concentration has to fall below the 23.0% alarm
setpoint or rise above the 19.5% alarm setpoint before the alarm will cancel.
Optional items fitted to or supplied with the unit may include the following:
1) Remote alarm repeater*
2) One or two medium duty relays
3) Test gas, flow indicators and control valves*
4) Flow adaptor*
Items marked with an asterisk (*) do not need to be specified at the time of order and may be
retro fitted

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4 Installation of the product
NOTE –The O2NE+ and Safe-Ox+ range of instruments are precision instruments and
therefore are susceptible to shock. Care should be taken when installing your O2NE+
or Safe-Ox+ so as to not damage the instrument.
4.1 Removal of warning label from display
Prior to fitting the Ax O2NE+™/Safe-Ox+™ the warning label must be removed from the
instrument display window. This is an easy peel label and should be removed easily without
leaving behind any residue.
4.2 Wall mounting
The Ax O2NE+™/Safe-Ox+™ should be mounted onto a wall at normal working head height
using the mounting lugs and drilling template supplied. Use the paper template to drill the 4
required holes in the wall and use the rawl plugs and screws provided to mount the unit. It is
not necessary to dismantle the Ax O2NE+™/Safe-Ox+™ main unit in any way prior to
installation. You need to ensure the mains plug, fused at 3 amps, is in easy reach of a power
socket.
The alarm repeater housing also has wall mounting lugs.

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4.3 Wiring installation
It is necessary to identify the model of Ax O2NE+™/Safe-Ox+™ prior to installation. The
calibration certificate accompanying each instrument will clearly identify the information
required. ***
ENSURE THAT THE
ELECTRICAL SUPPLY TO THE INSTRUMENT
IS SWITCHED OFF
WHILST INSTALLING ANY WIRING
***
4.4 AC supply models
Mains powered Ax O2NE+™/Safe-Ox+™'s are pre-wired with a mains cable, fitted with a plug
suited to the destination country. Where internal plug fuses are fitted, these are 3 amp. Ensure
that the unit is connected to the correct supply voltage (i.e. 110 or 230V AC). Where no fuse is
fitted in the plug, the instrument should be powered from a 3 amp fused outlet. The Ax
O2NE+™/Safe-Ox+™ is fitted with an internal fuse, which is rated at 500mA.
4.5 DC supply models
DC powered Ax O2NE+™/Safe-Ox+™ 's require a DC supply in the range 9-24V DC. A 2m
cable is factory fitted to the instrument. The DC supply should be connected to this cable as
follows:
1) Blue wire negative (0Volts)
2) Red wire positive (9 to 24Volts)

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4.6 Alarm repeaters
The Alarm repeater has four status indicators and a Mode button, which mimic the button and
indicators on the main Ax O2NE+™/Safe-Ox+™ enclosure.
An 8 metre, 8 core cable is pre-wired to the Ax O2NE+™/Safe-Ox+™ on units to be fitted with
an alarm repeater. This ensures that for a basic installation, there is no need to dismantle the
Ax O2NE+™/Safe-Ox+™ main unit. A maximum of three repeaters may be fitted in a daisy
chain configuration.
4.6.1 To connect a “Hard Wired” Remote Alarm Repeater
1) Disconnect the power supply from the Ax O2NE+™/Safe-Ox+™.
2) Open the Remote Alarm Repeater unit by removing the 4 screws in the front of the
case and carefully pulling the case apart. The connecting wires from the Ax
O2NE+™/Safe-Ox+™ pass through one of the cable glands on the Remote Alarm
Repeater.
3) Terminate the wires in accordance with the table below
1) Replace the lid of the Remote Alarm Repeater, insert and tighten the 4 screws, and
mount it in the desired position using the 2 fixing lugs.
2) Restore power to the Ax O2NE+™/Safe-Ox+™. Press the switch on the Remote
Alarm Repeater once, and ensure that the four indicators flash. Note that in the
presence of a genuine alarm, this test feature is disabled.
4.6.2 To connect a “Quick Connect” Remote Alarm Repeater
1) Disconnect the power supply from the Ax O2NE+™/Safe-Ox+™.
2) Insert the connector on the end of the wire into either socket on the bottom of the
Remote Alarm Repeater.
3) Restore power to the Ax O2NE+™/Safe-Ox+™. Press the switch on the Remote Alarm
Repeater once, and ensure that the four indicators flash. Note that in the presence of
a genuine alarm, this test feature is disabled.
REPEATER CABLE COLOURS
Type 1
Repeater
Term
Type 2 (Cat 5)
ST1
Terminal
No
8
3
7
2
6
4
5
5
4
6
3
7
2
8
1
1

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4.6.3 To connect a “Strobe” Remote Alarm Repeater
1) Disconnect the power supply from the Ax O2NE+™/Safe-Ox+™.
2) Open the Remote Alarm Repeater unit by removing the 4 screws in the front of
the case and carefully pulling the case apart. The connecting wires from the Ax
O2NE+™/Safe-Ox+™ pass through one of the cable glands on the Remote
Alarm Repeater.
3) Terminate the wires in accordance with the table below
4) Connect the free wire (Brown or Orange) to A50-231 main PCB at JP13 terminal
5.
3) Replace the lid of the Remote Alarm Repeater, insert and tighten the 4 screws, and
mount it in the desired position using the 2 fixing lugs.
4) Restore power to the Ax O2NE+™/Safe-Ox+™. Press the switch on the Remote Alarm
Repeater once, and ensure that the four indicators and the LED strobe flash. Note that
in the presence of a genuine alarm, this test feature is disabled.
REPEATER CABLE COLOURS
Type 1
Repeater
Term
Type 2 (Cat 5)
ST1
Terminal
No
8
3
7
*See Note
4
6
4
5
5
4
6
3
7
2
8
1
1

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4.7 Alarm relay output models
You may have ordered your Ax O2NE+™/Safe-Ox+™ with a relay. The relay contacts are ‘Volt-
Free’ single pole changeover, rated 240VAC/30VDC 2 amps. The relay is non-latching. This
means the relay will only initiate when gas is present. As standard the relays are setup in a
fail-safe configuration. This means that the relay is energised during normal operation. Please
note that on power up the relay is only energised after the 10 second start-up period. See
below for details of how the relay should be connected.
4.8 Relay wiring
The cable gland is for cables of outside diameter between 5 and 7mm, if cable fitted is outside
that range, a suitably specified cable gland must be used. Ensure that the gland is properly
tightened. Test that the cable is adequately gripped by the cable gland. Ensure that the cable
is suitable for purpose, the load is within the limits of the relay, 240VAC/30VDC, 2 amps, and
the insulation of the external circuit meets the requirements for basic insulation
240VAC/30VDC, 2 amps. After completing wiring, ensure that the terminal box cover is securely
replaced.
RELAY TERMINAL BOX TERMINATIONS
4.9 4 to 20mA output models
You may have ordered your Ax O2NE+™/Safe-Ox+™ with a 4 to 20mA output. A 2m cable is
factory fitted to the instrument. The 4 to 20mA output current is generated by the instrument.

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The customer system should be connected to this cable as follows and as per the following
drawing:
1) Blue wire 4 to 20mA negative
2) Red wire 4 to 20mA positive

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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.

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6 Maintenance
6.1 Oxygen cell replacement
The following instructions describes the replacement of the O2NE+™ & Safe-Ox+™ oxygen
sensor.
•Upon receiving the new sensor, remove from its packaging and leave for 24 hours to
stabilise in air.
•Power down the instrument and remove from its installed location to allow access to
the lid screws.
•Remove the lid of the instrument to gain access to the internals of the instrument.
•Disconnect the sensor from its location on the PCB.
•Remove the locking ring from the sensor and remove the sensor from the enclosure.
•Refit the new sensor by reversing the above process.
•Refit the enclosure lid and re-install the instrument and power up.
Upon renewing the oxygen sensor a full calibration will be required to be performed, this
should be done 2 hours after power up.

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6.2 Calibration adjustment
The following instructions apply to the O2NE+™, Safe-Ox+™, and any O2NE™ or Safe-Ox™
devices serviced on or after August 2014 (this date is printed on the product label).
•For older 10 year O2NE™ or 10 year Safe-Ox devices please follow the calibration
instructions found in: P0120-820-05 O2NE & Safe-Ox User Manual
•For standard O2NE™ devices please follow the calibration instructions found in the
AA1-810-18 - O2NE User Manual
•For standard Safe-Ox™ devices please follow the calibration instructions found in the
AA1-811-11 -Analox Safe-Ox User Manual
For O2NE+™, Safe-Ox+™ devices built before October 2016 please follow the calibration
instructions found in: P0120-820-10 O2NE+ & Safe-Ox+ User Manual (Please contact Analox
if manual is required).
Note: Gases used on the Ax O2NE+™/Safe-Ox+™ must be manufactured to a ±2% tolerance.
Note: For best performance the monitor should be powered and allowed to warm-up for
approximately 2 hours before calibration is performed. This will allow the whole instrument to
stabilise at its operating temperature.
6.2.1 Full calibration adjustment
A full calibration adjustment should be performed on the Ax O2NE+™/Safe-Ox+™ 2 hours after
initial installation or after a sensor replacement.
A proof test should be carried out at least every 12 months*thereafter (See section 6.4)
*Typical performance, with fixed temperature, humidity and pressure. Adjustment may be
required.
In order to perform a full calibration adjustment, you will need the following equipment:
1) Test Gas with 20.9% oxygen in nitrogen, +/-2% tolerance
2) O2NE+ and Safe-Ox+ 58/110L regulator kit (Comprising calibration gas bottle
regulator, flow adaptor and tubing).
Then follow the procedure:
1) Fit the flow adaptor to the O2 sensor and connect, with tubing, to the 20.9% O2
cylinder and open the regulator to allow for the flow of gas over the sensor.

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2) Enter Technician Mode by pressing the mode switch 3 times. If entered successfully
the green LED will flash off for 1.5 seconds and on for 0.5 of a second.
3) Select auto calibration by pressing the mode switch 4 times. The 2 Red Alarm LED’s
will light up to show you are now in this mode.
4) Press the mode switch 2 times to start the Auto Calibration, the Red Alarm LED’s will
turn off and the Green LED will continue to flash.
5) Wait one minute for the instrument to adjust. When the instrument has a new
calibration value, the buzzer will sound one bleep and all the LED’s will be off.
6) Accept this new calibration value by pressing the mode switch 2 times. The green
LED will flash to show the instrument has accepted the new oxygen value.
To return to normal operation, press the mode switch once. The LED’s and buzzer will illuminate
/ sound 4 times before returning to normal operation.
If, during the one minute wait period, the red or amber LED’s are illuminated consult the table
below.
ALARM1 LAMP
(RED)
ALARM2 LAMP
(RED)
FAULT LAMP
(YELLOW)
MEANING
ACTION
ON
OFF
OFF
Calibration gas is
above allowable
range
Ensure the
calibration gas is
20.9% oxygen in
nitrogen with
+/-2% tolerance
OFF
ON
OFF
Calibration gas is
below allowable
range
Ensure the
calibration gas is
20.9% oxygen in
nitrogen with
+/-2% tolerance
OFF
OFF
ON
Internal fault
Contact Analox.
Note: If at any time you send the wrong instruction and would like to abort, press the mode
switch once and wait 20 seconds, this should bring you back to technician mode. Press the
mode switch once again, this should bring you back to normal operation, the LED’s and buzzer
will illuminate/sound 4 times. Alternatively, disconnect the power supply to the Ax
O2NE+™/Safe-Ox+™, wait a moment and re-connect power.
6.3 Alarm checks
To verify that the indicators and the audible alarms are working, press the Mode switch on the
Ax O2NE+™/Safe-Ox+™ or any of its repeaters. The indicators and the audible alarm will
pulse four times.

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6.4 Proof test
To verify that the system is still operating within specification, you will need the following
equipment:
1) A test gas cylinder containing 17% oxygen in nitrogen, +/-2% tolerance
2) A bump test gas (For Safe-Ox+™ only) with 23.5% oxygen in nitrogen, +/-2% tolerance
3) 0.5 lpm regulator to suit calibration gas bottle
4) Flow adaptor - Part No: 8000-0069A
Then follow the procedure for the particular instrument type:
6.4.1 Ax O2NE+™
1) Fit the flow adaptor to the O2 sensor and connect, with tubing, to the 17% oxygen
cylinder and open the regulator to allow for the flow of gas over the sensor.
2) After a few moments, the 'Alarm 1' alarm should operate, followed a little later by the
'Alarm 2' alarm.
3) Remove the test gas. It will take a little while for the gas to diffuse out of the instrument
sensor, allowing the unit to recover to its normal non-alarm condition.
6.4.2 Ax Safe-Ox+™
1) Fit the flow adaptor to the O2 sensor and connect, with tubing, to the 17% oxygen
cylinder and open the regulator to allow for the flow of gas over the sensor.
2) After a few moments, the 'Alarm 2' alarm should operate.
3) Remove the test gas. It will take a little while for the gas to diffuse out of the Instrument
Sensor, allowing the unit to recover to its normal non-alarm condition.
4) Fit the flow adaptor to the O2 sensor and connect, with tubing, to the 23.5% oxygen
bump test cylinder and open the regulator to allow for the flow of gas over the sensor.
5) After a few moments, the 'Alarm 1' alarm should operate.
6) Remove the test gas. It will take a little while for the gas to diffuse out of the instrument
sensor, allowing the unit to recover to its normal non-alarm condition.
6.5 Adjusting alarm set points
The procedure is very similar for setting either Alarm 1 or Alarm 2.
1) Whilst the O2NE+™/Safe-Ox+™ is switched on, enter technician mode by pressing the
mode switch 3 times. If entered successfully the green LED will flash off for 1.5 seconds
and on for 0.5 of a second.
2) From technician mode, press the ‘Mode’ switch 2 times to set Alarm 1 or 3 times to set
Alarm 2. The buzzer will bleep on each press. If this is done successfully, the
instrument will show the ‘Fault’ indicator and the appropriate ‘Alarm’ indicator. If this is
done inadvertently, or if another mode is selected, press the ‘Mode’ switch once to
return to technician mode and then repeat this selection.
3) The display will indicate the present value of the alarm.
4) Press the ‘Mode’ switch twice to proceed to define a new setting, or once to abort and
return to technician mode.
5) Press and hold the ‘Mode’ switch. The displayed value will count down at approximately
one count per second. Release the switch when the displayed value is equal to the
desired alarm value.
6) Upon release of the ‘Mode’ switch, the display will continue to show the new value.
Accept the new setting by pressing the ‘Mode’ switch twice, or alternatively ignore the
new setting by pressing the switch once. This will return to the technician mode.
7) To exit from technician mode, press the Mode switch once. The O2NE+™/Safe-Ox+™
then restarts by performing the normal power on sequence (4 flashes).

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6.6 Fault conditions
During normal operation, the instrument carries out a continuous self-test procedure. If
operation is satisfactory, the ‘Good/OK’ status indicator will be on, blinking off momentarily
every few seconds.
1) If there are no indicator lamps lit on the O2NE+™/Safe-Ox+™, check that power is
connected and that the fuses are OK.
2) If the 'Good/OK' indicator is off, and the alarm indications are believed to be incorrect,
carry out a full calibration. If this fails to correct the problem contact your qualified
service engineer.
A summary of the indicator lamps and buzzer operations is shown in the following tables.
6.6.1 Ax O2NE+™
OK LAMP
(GREEN)
ALARM1 LAMP
(RED)
ALARM2 LAMP
(RED)
FAULT LAMP
(YELLOW)
MEANING
OFF
OFF
OFF
OFF
Power Off
ON/ BLIP OFF
OFF
OFF
OFF
Normal Operation
OFF
FLASHING AND
SLOW BUZZER
OFF
OFF
O2Level is
< 19.5% †
OFF
FLASHING
FLASHING AND
MED. BUZZER
OFF
O2Level is
< 18% †
OFF
OFF
OFF
FLASHING AND
SLOW BUZZER
Calibration Error at
Switch On ‡
OFF
FLASHING
OFF
FLASHING AND
FAST BUZZER
O2Cell Fault
Output too High
OFF
FLASHING ♦
FLASHING ♦
FLASHING AND
FAST BUZZER
O2Cell Fault
Output too Low
OFF
OFF
OFF
FLASHING AND
VERY FAST BUZZER
Internal system fault
contact Analox
†Note that alarm levels may be set at different values, depending on customer requirement
‡A calibration error or a cell fault requires the attention of a service engineer. A recalibration
procedure may overcome the problem.
♦Only when Alarm 1 and Alarm 2 are enabled.
6.6.2 Ax Safe-Ox+™
OK LAMP
(GREEN)
ALARM1 LAMP
(RED)
ALARM2 LAMP
(RED)
FAULT LAMP
(YELLOW)
MEANING
OFF
OFF
OFF
OFF
Power Off
ON/ BLIP OFF
OFF
OFF
OFF
Normal Operation
OFF
FLASHING AND
SLOW BUZZER
OFF
OFF
O2Level is
> 23.0% †
OFF
FLASHING
FLASHING AND
MED. BUZZER
OFF
O2Level is
< 19.5% †
OFF
OFF
OFF
FLASHING AND
SLOW BUZZER
Calibration Error at
Switch On ‡
OFF
FLASHING
OFF
FLASHING AND
FAST BUZZER
O2Cell Fault
Output too High
OFF
FLASHING ♦
FLASHING ♦
FLASHING AND
FAST BUZZER
O2Cell Fault
Output too Low
OFF
OFF
OFF
FLASHING AND
VERY FAST BUZZER
Internal system fault
contact Analox
†Note that alarm levels may be set at different values, depending on customer requirement
‡A calibration error or a cell fault requires the attention of a service engineer. A recalibration
procedure may overcome the problem.
♦Only when Alarm 1 and Alarm 2 are enabled.

O2NE+ & Safe-Ox+
User Manual Int. Approved
Document ref: P0120-820-14 August 2017 Page 18 of 23
Commercial in Confidence
7 Specifications
O2range
0.1 to 25%
Sensor accuracy*
Better than ± 0.75% O2 over 5.0 to 25.0% O2
Better than ± 1.00% O2 over 0.1 to 5.0% O2
Response time (T90)
<60 seconds
Operating temperature
0 to +40°C (+32 to +104°F)
Temperature effect
0.2% of reading/°C or 0.1115% of reading/°F
Atmospheric pressure range
811 to 1050mbar absolute
Warm up time
10 seconds to normal operation
Prior to calibration allow 2 hours to achieve full accuracy.
Weight (without cables)
O2NE+™/
600g
Alarm Repeater
150g
Dimensions
O2NE+™/Safe-Ox+™
175x105x75 mm
Alarm Repeater
155x72x45 mm
IP rating
O2NE+™/Safe-Ox+™
IP65
Alarm Repeater
Hard wired –IP65
Quick connect –IP43
Sensor type
Electro-Chemical Cell
Sensor life*
7 years in air
Display
4 digit Liquid Crystal Display
Alarms
2 x Alarm Visual Indicators
1 x System Fault Indicator
1 x Status Indicator
Common Audible Alarm
Relays
One or Two Optional Alarm Relays with changeover contacts assigned
to Alarm 1, Alarm 2 or System Fault.
Contact Rating 240V AC or 30V DC at up to 2A.
Contacts are non-latching Fail-Safe.
Output
2 wire, 4 to 20mA (Max load 150 Ω)
Power supply options
a) 210 to 250VAC supply
b) 110 to 120VAC supply
c) 9-24VDC supply
*Typical performance, with fixed temperature, humidity and pressure