Calibration - Tintometer Lovibond SensoDirect 150 Mode D'emploi

• To measure the dissolved oxygen content in any given liquid, it is sufficient to
immerse the tip of the probe in the solution, making sure that the velocity of the
liquid coming into contact with the probe is at least 0.2 - 0.3 m/s. This is
achieved by swirling the probe in the solution.
• During laboratory measurements, the use of a magnetic stirrer/ agitator is
recommended. In this way, errors due to air diffusion in the solution are reduced
to a minimum.
6. The display will show the Dissolved Oxygen values (mg/L). At the same time,
tom left display will show the Temp. value of the measured solution.
7. Rinse the probe carefully with normal tap water after each series of measurements.
Oxygen in the air
When the display unit shows "%O
Changing the Temp. unit to °F
To change the Temp. unit from °C to °F, please refer to page 19, chapter 7.6 (Temp. Unit
Default Setting).
"% Salt" compensation value adjustment
To change the % Salt compensation value, refer to page 20, chapter 7.10 (% Salt Com-
pensation value Setting).
"Height" (Altitude) compensation value adjustment
To change the Height compensation value, please refer to page 20, chapter 7.11 (Height
Compensation value Setting).

5.2 Calibration

1. Install the "Probe Plug" (Page 13, Fig. D-1) into the "DO Socket" (Page 4, Fig. A-15).
2. Power on the meter by pressing the "Power" button once.
3. Keep pressing the "Mode" button until the bottom right display shows "%O2".
Wait for at least 5 minutes until the display reading values stabilise with no fluctua-
tion.
4. Press the "REC" button and "HOLD" button at the same time. The display will show
the following screen, as an example. Now release.
23.5 °C
5. Press the "Enter" button twice. This will save the calibration data and finish the cali-
bration procedure. Finally the lower display will show "O2 CAL. OK". Return to the
normal screen. The complete calibration procedure will take approximately 30 sec-
onds.
32
", this represents an approximate air Oxygen value.
2
20.9
O2 CAL.
ESC:N ENTER: Y
the bot-
SensoDirect 150