9
ERROR DISPLAYS AND TROUBLESHOOTING
pH LCD
Display
ATC
Display
DISPLAY
Mode
Possible cause(s)
[Action(s)]
Any
Value
"OVER"
Measure
a. Temperature over 0 to
99.9°C range.
[Bring solution to a
lower/higher
temperature.]
[Replace temperature
probe.]
b. No temperature
sensor.
[Use a temperature
probe.]
"OVER" 0.0~
99.9°C Measure
pH value over 0.00
to14.00pH range .
[Over Range or
Recalibrate.]
"OVER"
0.0 ~ 60.0°C
pH CAL
a.pH-
STAND
b.pH-
SLOPE
a. Offset @ 7.00pH:
mV>90mV
mV>98.3mV
b. New slope>ideal
slope by 30%
[Use a new buffer
solution.]
[Replace electrode.]
"OVER"
0.0 ~ 60.0°C
pH CAL
a.pH-
STAND
b.pH-
SLOPE
a. Offset @ 7.00pH:
mV<-90mV
Offset @ 6.86pH:
mV< -81.7 mV
b. New Slope<ideal
slope by 30%
[Use a new buffer
solution.]
[Replace electrode.]
Any
Value
"OVER"
pH CAL
a.pH-
STAND
b.pH-
SLOPE
Buffer temperature over
0 to 60 °C range.
[Bring buffer
temperature within 0 to
60°C range .]
