AMC AMC-1BXX, Руководство пользователя, Страница: 45 / 57

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Caution:
In the case of repeated CO Gas Calibrations performed in quick succession (i.e. less
than 30 minutes apart) first follow the routine outlined in section 5.3.3, Pre Bump Test.
Then use the Background value provided by the unit during ADAPTiCAL startup.
A CO sensor element has a tendency to increase its background zero offset after each
span gassing. Entering a Background of 0.0 in the second or third attempt can lead to
failed calibration.
3. The operator will then be asked to provide a span level gas concentration (i.e. the
concentration of the target gas that is in the cylinder being used to calibrate). Use the
arrow keys to adjust the rightmost digit while pressing enter to commit each digit. Repeat
this for all digits.
a. It is recommended that this concentration be relatively close to the maximum
span range of the sensor for best results (as an example, service technicians
could use 75ppm gas concentration cylinder for calibrating 100ppm CO Span
sensor, however we recommend 100ppm CO).
4. The s
ensor ill enter uffering and the “Find Zero” stage of calibration, assessing the
output at the background concentration. When this stage succeeds, the operator will be
notified on screen and the calibration routine will pause until acknowledged. Before
acknowledging, get the target span gas ready to flow. When
ENTER is pressed start
applying the gas.
5. The sensor will wait until it detects ga
s and ill enter the “Find Span” stage of
calibration. This typically takes between 30 and 180 seconds.
6. Once this stage succeeds, the sensor will check that the result is within limit and notify
the operator whether the calibration routine has failed or succeeded. The operator
maybe be notified if sensor is nearing end of life.
7. If the calibration failed, the calibration can be attempted again right away, but it is
recommended that the operator accepts the background gas concentration provided by
the unit since the unit will retain the original background gas concentration.