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1.1.2 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’s fast responding and has a built-in auto
calibration feature that adjusts the sensor to ambient every 180 hours.
1.1.3 Smart Electronics
The Dual O2/CO2 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.
1.1.4 Calibration O
2
The Dual O2/CO2 monitor incorporates a stable zirconium oxide sensor that rarely
requires calibration. Changing barometric pressures or changes in temperature and
humidity do not affect the zirconium oxide oxygen cell. The earth is a wonderful source
of calibrated oxygen at 20.9% therefore under ambient conditions verification of the
Dual O2/CO2 monitor to 20.9% oxygen is constantly being performed. There are no
zero or span pots to adjust. The O
2
monitor only requires periodic testing with nitrogen
to verify the cells response to low oxygen levels. See Section 6.2 for the testing
procedure to nitrogen.
1.1.5 Calibration CO
2
The Dual O2/CO2 monitor incorporates an NDIR CO
2
sensor that provides an accurate
reading that is the difference between a reference baseline setting and the measured
gas concentration. The sensor is factory calibrated and requires no user calibration but,
as typical with most NDIR sensors, long term drift can affect the baseline setting. Under
normal conditions, the sensor provides automatic baseline adjustments and no further
action is required by the user. However, under certain conditions, manual adjustments
may be required. See Section 6.3 for further explanation and procedures for adjusting
the baseline setting.