Graph 2 - Typical zero gas purge times
Cross-Gas Effects
CO
2
Cell
Carbon dioxide is measured by infrared absorption at a wavelength specific to carbon dioxide. There
is a small cross interference of 1,000:1 from N
2
O which is compensated for within the G210.
Therefore, the carbon dioxide reading will not be affected by any other gases.
O
2
Cell
The oxygen sensor is a galvanic cell type and suffers virtually no influence from CO2, CO, H2S, NO2,
SO2 or H2, unlike many other types of oxygen cell.
N
2
O Cell
Nitrous oxide is measured by infrared absorption at a wavelength specific to nitrous oxide and suffers
virtually no influence from CO, H2S, NO2, SO2 or H2.
Note: To compensate for the influence of N
2
O on the CO
2
it is important the Zero and N
2
O Span
calibrations do not contain CO
2
. CO
2
will have an influence on the N
2
O channel. It is recommended
that the Soda Lime CO
2
filter is used.
CO Cell
Carbon monoxide is measured by an electrochemical gas sensor. It is not affected by the other
measurement gases but can have cross interference from gases not normally present in medical
supply gases and suffers virtually no influence from CO2, H2S, NO2, SO2.
Hardware Reset
If for any reason the instrument ‘locks up’ and will not switch off, or the instrument appears off and
will not turn on, it is possible to force an emergency power off. Pressing and holding the ‘On/Off’ key
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