ERROR DISPLAYS AND TROUBLESHOOTING
pH
LCD
ATC
Display
DISPLAY
Mode
Possible cause(s)
[Action(s)]
"OVER"
"OVER"
pH
Temperature > 100.0
°
C.
[Bring solution to a
lower temperature.]
"UNDR"
"UNDR"
pH
Temperature < -10.0
°
C.
[Bring solution to a
higher temperature.]
"OVER"
-10.0~
100.0°C
pH
pH >14.00pH .
[Over Range or
Recalibrate.]
"OVER"
0.0 ~ 60.0°C
pH CAL
a.pH-
OFFSET
b.pH-
SLOPE
a. Offset @ 7.00pH:
mV>100mV
[email protected]:
mV>108.3mV
b. New slope>ideal
slope by 30%
[Use a new buffer
solution.]
[Replace electrode.]
"UNDR"
0.0 ~ 60.0°C
pH CAL
a.pH-
STAND
b.pH-
SLOPE
a. Offset @ 7.00pH:
mV<-100mV
Offset @ 6.86pH:
mV< -91.7 mV
b. New Slope<ideal
slope by 30%
[Use a new
buffer solution.]
[Replace electrode.]
"UNDR"
-10.0 ~
100.0°C
pH
pH<0.00pH.
[Under Range or
Recalibrate.]
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