PureAire Monitoring Systems, Inc.
2
1: Introduction
The
Air Check
O
2
Deficiency Monitor is a compact gas monitoring system that’s ideal for the
continuous monitoring of inert gas storage areas, confined spaces, and other locations where
low oxygen levels may pose a hazard to personnel. Unlike electrochemical sensor cells the
Air
Check
O
2
zirconium cell provides stable oxygen readings even in areas where temperature
and humidity levels are changing. The PureAire
Air Check
O
2
Deficiency Monitor is suitable
for either indoor or outdoor use. Factory calibrated against a NIST traceable reference standard
and Ce approved.
The heart of the monitoring system is a long lasting zirconium sensor, which responds to low oxygen
conditions within seconds and provides accurate measurements over a wide temperature and humidity
range. The zirconium O
2
sensor cell will operate continuously for 10 or more years and requires an
absolute minimum of maintenance. There are no zero or span calibration pots to adjust and when
compared to disposable type sensors, our long life zirconium O
2
sensor can save up to hundreds of
dollars in annual maintenance.
Ideal for continuously monitoring oxygen levels in confined spaces or areas where inert gases are used,
the
Air Check
O
2
Deficiency Monitor does not drift or loose sensitivity when the weather or
temperature changes. The electronics are housed in a Nema 3 housing.
Each system consists of a long life zirconium oxide sensor cell and three-wire transmitter. The
Air
Check
O
2
monitor may be used as a stand-alone gas detector, linked to optional PureAire single and
multipoint controllers, or connected to your own centralized control and surveillance system. This
manual covers the installation, operation, and maintenance of the
Air Check
O
2
deficiency monitor.
1.1 Key Features
The
Air Check
O
2
monitor incorporates a number of user-friendly features designed to simplify
installation, operation, and maintenance.
1.1.1 Long Life Zirconium Oxide O
2
Sensor
The system’s O
2
sensor cell has a life of well over 10 years of continuous operation. Unlike
concentration O
2
cells, PureAire’s exclusive zirconium oxide sensor cell does not need an oxygen
reference gas for proper operation. The
Air Check
O
2
monitor can detect low oxygen levels in
confined spaces and process tools without the need of a reference gas.
1.1.2 Smart Electronics
The
Air Check
O
2
monitor incorporates a special electronic circuit that continuously monitors sensor
operation. With the addition of the alarm relay option, any cell degradation or complete failure will
immediately be detected. This smart circuitry alerts the user to sensor faults and other electrical
problems that may interrupt surveillance through the standard mA signal output signal or through the
optional fault relay option.
