OHAUS STARTER 2100, Instruction Manual

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11
5 Maintenance
5.1 Error message
If the measurement out of range, pH: < 0.00 or > 14.00;mV: < -1999 or > 1999 ; the buffer
temperature T[°C] < 5 or > 40
, then the meter will display “
- - -
“.
If meter display “
Err
” , it means
Err
Self-diagnosis failure
Or Calibration failure
Repeat the self-diagnosis. (See 5.4)
Calibration failure (slope < 85%, offset > 60mV);
you need to use fresh buffer to do calibration
again properly; if still not good, need to replace
the pH electrode.
Any more problems, you can contact Ohaus sales rep or email pH@ohaus.com .
5.2 Meter maintenance
Never unscrew the two halves of the housing!
The
STARTER 2100
series instruments do not require any maintenance other than occasional wipe
with a damp cloth and the replacement of depleted batteries.
The housing is made of acrylonitrile butadiene styrene (ABS). This material is attacked 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 good enough, try:
o
Soak the electrode in 0.1M HCl for more than 8 hours.
o
For fat or oil contaminant, degrease the membrane with cotton wool soaked in either
acetone or a soap solution.
After electrode treatment, a new calibration should be performed. If the electrode slope is still not
good, the electrode might need to be replaced.
5.4 Self-diagnosis

Press and hold button- Read and button- Cal simultaneously until the meter display the full
screen. Each icon blinks one after the other.
This way you may check whether all icons are correctly shown. The next step is to check that the
keys are functioning correctly. This requires user interaction.