PureAire Monitoring Systems, Inc.
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P a g e
1: Introduction
The
Air Check
✓
O
2
water resistant monitor is a self-contained Oxygen deficiency detection system
suitable for remote sampling of confined spaces that require daily wash-downs. It’s 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 UL, CUL 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 8 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 food processing areas where inert gases are used in
freezing tunnels, the
Air Check
✓
water resistant O
2
monitor does not drift or loose sensitivity when
the weather or temperature changes. The electronics are housed in a 4X IP65 water resistant housing
capable of withstanding water projected from a nozzle.
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
✓
water resistant O
2
deficiency monitor.
1.1 Key Features
The
Air Check
✓
O
2
monitor incorporates several 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 8 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 built-in alarm relay, 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 and through the fault relay.
