Calibration In Line - Hach ORBISPHERE 3650 Atex User Manual

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 (refer to
instrument's CAL button on page 37
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
6. When the reading is adjusted to the known
concentration, press
7. The instrument displays CAL and returns to
the measurement mode.
Calibrations
Locking out the
for
keys.
CAL again.
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