Hach-Lange ORBISPHERE 3650 - Manual (Page 45)

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Calibrations
6.4.2 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 gas 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 39 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 gas 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.