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Appendix Model 9700
TELEDYNE BROWN ENGINEERING
Analytical Instruments
To determine the concentration of a compound present at the sensor
from a meter reading, when calibrated with methane, divide the reading (in
percent methane) by the factor. For example, if ethylene is flowing by the
sensor, and a meter reading of 2.0% is obtained, the concentration of
ethylene would be:
For hydrogen:
For carbon monoxide:
For a mixture of 70% hydrogen and 30% carbon monoxide:
CAUTION: In most cases, the concentration of any particular compound
that the sensor is exposed to should not exceed the LEL of that
compound, or sensor damage could occur.
The concentration of combustibles should never exceed that
which will react completely with the available oxygen present in
the sample (stoichiometric burning), otherwise, "coking" (the
deposition of carbon from incomplete combustion) will occur at
the sensor, and drift and a loss of sensitivity will result.