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STARTER 300D Portable DO Meter
5
MAINTENANCE
5.1
Error message
Error 0
Memory access error
Error 1
Self-diagnosis failed
Error 2
Measured values out of range
Error 3
Measured buffer temperature
out of range (<0° C or >50 ° C)
Error 4
Cal 2 out of range
Error 5
Cal 1 out of range
Error 9
The current data set has
already been stored once
Any more problems, you can contact Ohaus sales rep.
5.2
Meter maintenance
Never unscrew the two halves of the housing!
The STARTER 300D does not require any maintenance other than replacement of depleted
batteries. To clean, use a damp cloth.
The housing is made of acrylonitrile butadiene styrene (ABS). This material is susceptible to
damage by some organic solvents, such as toluene, xylene and methyl ethyl ketone (MEK). Any
spillage should be immediately wiped off.
5.3
Electrode maintenance
The DO sensor measures the oxygen based on galvanic principle. The DO electrode produces a
mV-output proportional to the oxygen concentration present in the sample. Oxygen diffuses
through the membrane and is being consumed at the cathode, producing an electrical current.
Although the amount of oxygen consumed is low, a new sample should still flow
o
past the membrane to prevent false readings.
For maximum lifetime and maximum accuracy, the sensor should be handled with
o
the proper care.
Before and after use, rinse the sensor with clean pure water and wipe it with a soft
o
tissue.
Reset to factory settings
Repeat the self-diagnosis procedure and make
sure that you finish pressing all five keys within
two minutes.
Make sure that the electrode setting cap has been
removed and the electrode is properly connected
and placed in the sample solution.
Keep the standard buffer temperature within the
range for calibration or measurement.
Make sure the buffer is correct and fresh;
Clean or replace the DO electrode.
Make sure the buffer is correct and fresh;
Clean or replace the DO electrode.
A measurement can only be stored once. Perform
a new measurement to store a new data set.
EN-13
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