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3650 Portable O2 Analyzer - Calibrations 33 of 50
Operator Manual
ORBISPHERE
4.2.2 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 28 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.