• Wait a few minutes for the instrument to automatically compensate for any
difference in temperature between the probe and the liquid.
• Read the DO content of the liquid in mg/L on the upper display and its temperature
on the lower display.
• Rinse the probe head with tap water after each measurement.
• Replace the probe head protective cover.
A DO measurement tip
Agitating the liquid reduces the effect and measurement errors caused
by oxygen diffusing into the liquid from ambient air. At a minimum, this
can be done by shaking the probe while it is immersed. To minimize
measurement errors of this type, General recommends using a
magnetic agitator, especially in laboratory settings.
2. To measure the oxygen content of a volume of air
, first make sure that the oxygen
probe is full of fresh electrolyte, calibrated and correctly inserted, and that the meter is
powered on. Then press the
▼
button (which has the word “Function” stenciled above
it) to make the display show “%O2” instead of “mg/L”. Wait at least five minutes until
the readings stabilize. To return to “mg/L” readings, press the
▼
button again.
Whenever the DOM5512SD is in measurement mode, you can turn off the backlight
(which is on by default) by briefly pressing (but not holding) the POWER/ESC button.
To reactivate the backlight, briefly press the button again.
Whenever the instrument is in measurement mode, you also can check the current date
and time by briefly pressing the TIME button. Doing so causes both values to appear
briefly at the lower left of the display.
HOLDING AND STORING MEASUREMENTS
1. To hold a measured value
, press the HOLD/ESC button during the measurement.
Doing so will cause the word “HOLD” to appear at the top of the display. Pressing the
HOLD/ESC button again releases the hold.
2. To record and recall readings
, press the REC/ENTER button while making
measurements. This will make the term “REC” appear at the top of the display.
Pressing the REC/ENTER button again, briefly, will make the term “MAX” appear to the
right of “REC” and switch the display to the maximum value stored in memory during
the last recording session. Pressing the REC/ENTER button again, briefly, will make the
term “MIN” appear to the right of “REC” and switch the display to the minimum value
stored during the last session.
3. To exit recording mode
, press and hold the REC/ENTER button for at least three
seconds, until the term “REC” disappears from the top line of the display. The display
will then revert to showing the current reading.
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