Maintenance; Error Message; Meter Maintenance; Electrode Maintenance - OHAUS ST300 Instruction Manual

EN-14
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 (<5 or >40 °C)
Error 4 Offset out of range
offset > 60mV or < - 60 mV
Error 5 Slope out of range
Error 6 Meter cannot recognize the
buffer
Error 9 The current data set has
already been stored once
For further technical support please contact Ohaus. (US please contact 1-800-672-7722)
5.2

Meter maintenance

Never unscrew the two halves of the housing!
The STARTER 300 series instruments do 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

Make sure the electrode is filled with electrolyte solution. Always store the electrode according to
the electrode instruction manuals and do not allow it to dry out.
If the electrode response becomes sluggish or the slope is not acceptable, try the following:
Soak the electrode in 0.1M HCl for at least 8 hours.
o
For fat or oil contaminant, degrease the membrane with cotton wool soaked in either
o
acetone or a soap solution.
After electrode treatment, a new calibration should be performed. If the electrode slope is still not
acceptable, the electrode might need to be replaced.
STARTER 300 Portable pH Meter
Reset to factory settings
Repeat the self-diagnosis procedure and make
sure that you finish pressing all five keys within
two minutes.
Check if the electrode is properly connected and
placed in the sample solution.
Keep the pH buffer temperature within the range
for calibration
Make sure the pH buffer is correct and fresh;
Clean or replace the pH electrode.
Make sure the buffer is correct and fresh; Clean
or replace the pH electrode.
Make sure the buffer is correct and fresh; check if
the buffer has not been used more than once.
An endpoint reading can only be stored once.
Perform a new measurement to store.