Thermo Fisher Scientific Eutech pH 5/6 Plus & Ion 6 Plus (New version R1.1, SN >797406) - Manual (Page 18)

Instruction Manual pH 5+, pH 6+, Ion 6+
5. TROUBLESHOOTING
Problem Cause Solution
No display
Batteries absent or
installed incorrectly
Insert batteries using correct polarity
“LO” Low battery Replace batteries.
“ - - - ” on
display
Ion 6+ requires calibration Perform either 2 or 3 point ion calibration
Unstable
reading
a) Dry electrode
b) Dirty electrode
c) Temperature changing
a) Hydrate / soak pH electrode
b) Clean electrode
c) Allow time for electrodes and solution to stabilize
Not able to
calibrate
a) Display freezes
b) Faulty electrode
c) Inaccurate buffer
a) Release reading by pressing .
b) Replace electrode.
c) Use fresh buffer solutions

mV out of range Check the probe/ solution

Buffer value is out of
tolerance Use new calibration solution & recalibrate. Ensure
correct pH buffer group was selected.

Ion calibration exited after
1 point calibration Perform at least 2 point ion calibration before
exiting. (Ion 6+)

ISE slope not within the
specified tolerance Re-calibrate. Check Ion Selective Electrode & refer
to ISE manual (Ion 6+)

Ion calibration points are
not 1 decade apart Perform calibration with consecutive values. For
example, use 1, 10, & 100 , not 1 & 100 (Ion 6+)

Upon exit of calibration
mode, a 1-point
calibration was attempted
with a pH buffer other
than 7.00 or 6.86.
Repeat pH calibration using one or more points
which include either 7.00 (USA) or 6.86 (NIST)
standards.

Over range: reading
exceeds maximum value

Under range: reading
exceeds minimum value
Ensure that the value being measured is within the
range of the selected mode. Confirm that
electrode(s) are connected and working properly.
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