Thermo Scientific Alpha pH 560
40
Chapter 8
Troubleshooting
Problem
Cause
Solution
Power on, but
no display
a) Loose connections
b) Incorrect output
voltage of the
power adaptor
a) Ensure cables make
good contact
b) Use an power
adaptor with
specified output
voltage
Unstable pH
reading
a) Dirty electrode
b) Electrical noise
interference
a) Clean electrode and
recalibrate
b) Switch to Symmetric
mode
Oscillating
temperature
readings
a) Electrical noise
interference
a) Ensure shield wire is
properly connected
to pin 7
Slow response
a) Dirty / Oily
electrode
a) Clean electrode
Blinking ATC
a) No temperature
probe connection
during ATC mode
a) Ensure temperature
sensing cable makes
good contact
Blinking
electrode
annunciator
a) Error in calibration
a) Ensure calibration
standard solution is
not contaminated.
Ensure electrode is
clean.
Or (pH)
a) pH electrode is not
connected
a) Ensure electrode
makes good contact
with Transmitter
Or
(Temperature)
a) Temperature probe
is not connected
when ATC enabled
a) Ensure electrode
makes good contact
with Transmitter
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