Dissolved Oxygen Measurement; Before Starting - VIO OXY 70 Manuel D'utilisation

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:
Dissolved O Saturation expressed in %.
•
2
Dissolved O Concentration expressed in mg/l, corresponding to ppm mg/l = ppm.
•
2
• Barometric pressure.
• During the measurement press the button
• Performing the measurement
Remove the protective cap of electrode, rinse it with distilled water; dab it with paper towel and dip in the
solution to analyse. Gently stir and wait until the value stability, when the icon
take the reading.
UM Serie Oxy70Vio EN rev.0 28.05.2020
was pressed with still unstable signal. Wait for the icon
, in order to change the unit of measurement.
17
to appear
appears on the display,
EN