HACH LANGE ORBISPHERE 3650, Руководство пользователя

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35
Calibrations
6.2.2 Calibration in line
The in line calibration procedure can be used to calibrate the sensor directly in line, against a
liquid sample with a known dissolved oxygen concentration. To perform this type of calibration,
the instrument must be set for calibration
In line
. Switch on the instrument, if necessary, and
wait a minute or so for the displayed measurement to settle. Expose the sensor to a liquid
sample with a known gas concentration.
1.
Press the
CAL
button. Remember, this
button may have been locked out to prevent
an accidental reset (see
Locking out the
instrument’s CAL button on page 31 for
details).
2.
A brief clearing
[---]
message appears.
3.
Press
CAL
again within a 3 second period.
4.
A measurement will flash on the LCD,
showing the oxygen concentration of the
calibration sample.
5.
Assuming you know the gas content to be a
certain value, you can adjust the displayed
value with the
Up/Down Arrow
keys.
6.
When the reading is adjusted to the known
concentration, press
CAL
again.
7.
The instrument displays
CAL
and returns to
the measurement mode.