O2NE+ & Safe-Ox+
User Manual
Int. Approved
Document ref: P0120-820-14
August 2017
Page 5 of 23
Commercial in Confidence
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-O
x+™ 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
