28
VIII. ERROR DISPLAYS AND TROUBLESHOOTING
LCD
display
Temperature
display
DISPLAY
unit
Possible cause(s)
[Action(s)]
"OVER"
"OVER"
pH
a. Temperature > 120.0°C.
[Bring buffer/solution to a lower
temperature.]
[Replace temperature probe.]
b. No temperature sensor.
[Use a temperature probe.]
"OVER"
"UNDR"
pH
Temperature < -10.0°C.
[Bring buffer/solution to a higher
temperature.]
"OVER"
-10.0~
120.0°C
pH
pH>16.00 .
[Recalibrate.]
"OVER"
0.0 ~ 60.0°C
pH-Cal
pH>16.00.
[Use a new buffer solution.]
[Replace the electrode.]
"OVER"
0.0 ~ 60.0°C
a.pH-Cal-
STAND
buffer 7.00pH
b.pH-Cal-
STAND
buffer 6.86 pH
c.
pH-Cal-
SLOPE
a. mV>100mV or mV<-100mV
b. mV>108.3mV or
mV < -91.7 mV
c. Slope mV>ideal slope by 30%
or mV < ideal slope by – 30%
[Use a new buffer solution.]
[Replace electrode.]
"UNDR"
-10.0~
120.0°C
pH
pH<-2.00
[Recalibrate.]
"UNDR"
0.0 ~ 60.0°C
a.pH-Cal-
STAND
b.pH-Cal-
SLOPE
a. Offset @ 7.00pH: mV<-
100mV
[email protected]:mV<
-91.7
mV
b. New Slope<ideal slope by
30%
[Use a new buffer solution.]
[Replace electrode.]
"OVER"
don’t care
ORP (ABS or
REL)
a. ORP ABS display > +2500
mV
[Bring solution to a lower ORP
reading]
Содержание 6309 POT
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