Thermo Fisher Scientific Alpha pH 600 RF (In the process of updating the brand guideline & product image) - Manual (Page 41)

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8 T R O U BL ESHO OTI N G
Cause
Problem 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