c) Button functions
Button
Function
button
Power supply / calibration
1. Press this button to switch the device on or off.
2. Press and hold the button, to select calibration mode.
Button
Selecting the operating mode
1. Press this button to switch between the operating modes DO (mg/l), DO
(ppm) and O2 (%).
2. Press and hold this button, to toggle the temperature unit between °C
and °F.
button
Select display: Hold / Max & Min
1. Press this button to freeze a measured value in the LCD display
(6)
.
2. Hold this button, to switch to the maximum/minimum values in the dis-
play mode. Push this button briefly to toggle between the maximum and
minimum values.
3. Press and hold the button to delete the measured value so you can take
a new measurement.
d) Switching on/off
•
Briefly press the
button
(4)
to switch the meter on or off.
• When you turn the device on, all segments of the LCD display
(6)
will appear for a few sec-
onds. Then, depending on the measuring sensor used, a measured value and temperature
will be displayed.
• The status display of the battery
(B)
at the bottom left of the display shows the current status
of the batteries inserted. If this symbol flashes, the batteries are flat and must be replaced.
See section “a) Inserting/replacing the batteries”.
e) Calibration
1.
Remove the sensor protective cap
(12)
. Press the
button
(4)
, to switch the device on.
2. Press the MODE
button
(10)
, to select O2 mode (oxygen). The “O2” symbol appears
in the LCD display
(6)
.
3. Wait 10 to 30 minutes, until the sensor has polarised. The measured value should be ap-
prox. 101.7 % saturation, if the sensor has completely polarised. The value may not reach
101.7 % upon the first attempt at calibration. If the value reaches 85 % you can calibrate
the probe at hand.
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