8 t rouble shoot in g – Thermo Fisher Scientific Alpha pH 550 User Manual
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8 T ROUBLE SHOOT IN G
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