Calibration Range; Errors During Calibration; Dissolved Oxygen Measurement; Before Starting - VIO OXY 7 Manual De Instrucciones

 On the display, the string "POINT oxy 0.0" appears; the device will search for the value %O
 Gently stir the probe in the Standard and eliminate any air bubbles under the membrane, moving the
sensor.
The scrolling on the display of four red bands

 Consider the measurement truthful only when the stability icon appears
 Confirm the value by pressing the button
 The instrument automatically returns to measure mode.
The beaker icon

0% O .
2
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 sensor maintenance.
 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.
UM Serie Oxy7Vio EN rev.0 28.05.2020
appears at the bottom left, indicating that the instrument is calibrated on value
was pressed with still unstable signal. Wait for the icon
means that the measurement is not stable yet.
.
16
= 0%.
2
.
to appear
EN