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Trimmer Adjustment (CO
)
2
Transmitter models with CO
measurement
2
have an inlet for calibration gas. Supply the
calibration gas with a known concentration
(for example, 1000 ppm) to this inlet using a
3 mm inner diameter silicone tube and a
EN
0.4 l/min flow.
Turn on the gas flow and wait for three
minutes for measurement to stabilize. If you
are adjusting without calibration gas, avoid
breathing on the transmitter. You should only
adjust the transmitter when the CO
reading
2
is stable.
Rotate the CO
trimmer slightly during
2
normal measurement. If the trimmer is not
centered, you see the trimmer centering
screen first. Simply turn the trimmer to the
center and wait for the progress bar to
complete.
In the adjustment screen, turn the trimmer to
set the desired correction. To commit the
change, stop turning the trimmer and wait.
The transmitter will show with a text screen if
the adjustment was successful, or failed due
to an unstable CO
reading.
2
Repeated trimmer adjustments are
cumulative. Wait for a few minutes between
adjustments to allow the CO
reading to
2
stabilize.
15
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