PureAire Monitoring Systems, Inc.
4
1: Introduction
The
CO
2
Monitor is a compact gas monitoring system that is ideal for the continuous monitoring of
inert gas storage areas, confined spaces, and other locations where carbon dioxide levels may pose a
hazard to personnel. The patented NDIR CO
2
cell provides stable readings even in areas where
temperature and humidity levels are changing. The PureAire
CO
2
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 an NDIR self-calibrating carbon dioxide sensor. The CO
2
cell
responds to high carbon dioxide conditions within seconds and provides accurate measurements over a
wide temperature and humidity range. The NDIR CO
2
sensor cell will operate continuously for many
years and requires an absolute minimum of maintenance. There are no zero or span calibration pots to
adjust and it’s built-in auto calibration can save time and money in annual maintenance.
Ideal for continuously monitoring carbon dioxide levels in confined spaces or areas where inert gases
are used, the
CO
2
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 NDIR sensor cell and three-wire transmitter. The
CO
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
CO
2
monitor.
1.1 Key Features
The
CO
2
monitor incorporates several user-friendly features designed to simplify installation,
operation, and maintenance.
1.1.1
NDIR CO
2
IR sensor
The system’s CO
2
sensor cell is a patented Non Dispersive Infrared, (NDIR) cell designed to detect
continuous levels of CO
2
. It is fast responding and has a built-in auto calibration feature that adjusts
the sensor to ambient every 180 hours.
1.1.2 Smart Electronics
The
CO
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 output signal or through the optional fault relay option.
