selected). Now, we need an offset that corresponds with the minimum CO
2
reading
(300 ppm).
3-10
If the current is 16.25 mA, then
3-11
Example 5: Computing cell temperature from a voltage output
Cell temperature (T in °C) is calculated from the DAC output with the following:
3-12
where X
F
is the full scale temperature value that corresponds to the high voltage, X
Z
is the temperature value that corresponds to the low voltage, V is the voltage read-
ing, and V
max
is the output range (either 2.5 V or 5 V).
Example 6: Computing cell pressure from a voltage output
Cell pressure (kPa) can be computed from a voltage output with the following:
3-13
where X
F
is the full scale pressure value that corresponds to the high voltage, X
Z
is
the pressure value that corresponds to the low voltage, V is the voltage reading, and
V
max
is the output range (either 2.5 V or 5 V).
Section 3. Configuring the gas analyzer
3-7Computing readings from the DAC output
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