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In Line Calibration
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.
Press the CAL button. Remember, this button
may have been locked out to prevent an
accidental reset.
A brief clearing [---] message appears. Press
CAL again within a 3 second period. A
measurement will flash on the LCD, showing the
oxygen concentration of the calibration sample.
Assuming you know the gas content to be a
certain value, you can adjust the displayed value
with the × Ø keys.
When the reading is adjusted to the known
concentration, press CAL again. The instrument
displays CAL and returns to the measurement
mode.
In Air Calibration (oxygen sensors only)
The oxygen sensor can be accurately calibrated
in air. To perform this type of calibration, the
instrument must be set for calibration In air.
You can perform this procedure with the sensor
connected to the instrument, but without the flow
chamber mounted.
The membrane must be dry, and prior to
calibrating it may be necessary to remove the
screw-on protection cap and its optional grill to
make sure that the components are not damp.
Switch on the instrument, if necessary, and wait a
minute or so for the displayed measurement to
settle.
The process is then exactly the same as for
calibration in a span gas, detailed previously.
Calibration (cont)