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ATTENTION: Before proceeding with the calibration operations, carefully consult the safety data
sheets of the substances involved:
•
Zero oxygen Standard calibration solution
Note: The Zero Oxygen Standard Solution is SINGLE DOSE! After its use, contact your local distributor for
the purchase.
Perform the calibration in air at 100% too. This procedure remains saved, even after the
turning off of the device.
• Calibration range
The time range between two calibrations (100% in air) depends on the type of the sample, the efficiency of
the electrode and the researched accuracy; usually, it is necessary to calibrate the instrument at least once
a week, but for a better accuracy, it is recommended to calibrate it more often.
The instrument must be recalibrated, if occurs one of the following conditions:
•
New probe, or probe not used for a long time
After the luminophore replacement.
•
• Errors during calibration
NOT STABLE: The button
•
to confirm the point.
WRONG BUFFER: The buffer is polluted or not part of the recognized families.
•
SLOPE OUT OF RANGE: The slope of the sensor calibration line is out of the acceptable range 80 - 120%.
•
•
CALIBRATION TOO LONG: The calibration exceeded the time limit: only the points calibrated up to that
moment will be kept.
Dissolved oxygen measurement
• Before starting
In order to reduce measurement errors and get the greatest possible accuracy, observe the following rules
before starting:
•
The sensor must be calibrated;
•
The sensor must be placed in a vertical position with the membrane downwards;
Remove the protective cap;
•
•
The sensor must be at the same temperature of the sample to analyse; if necessary, leave the probe
immersed in the sample until the reaching of thermal equilibrium.
• Measure Mode
The instrument can work in two different measure modes:
was pressed with still unstable signal. Wait for the icon
21
to appear
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