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Instruction Manual
8. Troubleshooting
Problem
Power on, but no display
Unstable conductivity
reading
Oscillating temperature
readings
Slow response
Blinking ATC
Blinking electrode
annunciator
Or (Conductivity)
Or/Ur (Temperature)
Cause
a) Loose connections
b) Incorrect output voltage of
the power adaptor
c) Cables not in correct polarity
(+ and – position)
a) Air bubbles in the probe
b) Dirty probe
c) Probe not deep enough in
sample
a) Electrical noise interference
a) Dirty / Oily probe
a) No temperature probe
connection during ATC mode
a) Error in calibration
b) Conductivity value of the
calibration standard is not
within acceptable range
a) Conductivity reading is
above the selected
measuring range
a) Temperature probe is not
connected when ATC
enabled
b) Temperature value exceeds
above/ below the specified
range
28
Alpha-COND 550
Solution
a) Ensure cables make good
contact
b) Use an power adaptor with
specified output voltage
c) Re-wire loop cables with correct
polarity
a) Tap probe to remove air bubbles
b) Clean probe and recalibrate
c) Ensure that the sample entirely
covers the sensor of the probe
a) Ensure shield wire is properly
connected to pin 7
a) Clean probe
a) Ensure temperature sensing
cable makes good contact
a) Ensure calibration standard
solution is not contaminated.
Ensure electrode is clean
b) Ensure calibration standard is
within 10 to 100% of full-scale of
the selected measuring range
a) Ensure correct conductivity
measurement range is selected
a) Ensure electrode makes good
contact with monitor
b) Ensure temperature calibration is
done properly. Ensure process
temperature is within the
specified range
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