PCE Instruments PCE-PH 25, Руководство по эксплуатации

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12
ONGOING MAINTENANCE
A. Replace Electrode
1. Unscrew the electrode collar to
remove the electrode & ATC
assembly as shown in the right
figure.
2. Remove the old electrode
assembly from the electrode
collar.
3. Insert a new electrode assembly
and make sure the electrode fit
back into the meter correctly.
4. Screw back the electrode collar.
ERROR DISPLAYS AND TROUBLESHOOTING
Display
Mode
Main
Display
Secondary
Display
Possible cause(s)
[Action(s)]
pH
Measure
or
pH
Calibration
UNDR UNDR
Temperature< -5.0°C .
[Bring solution to a higher
temperature.]
[Replace electrode.]
OVER OVER
Temperature> 60.0°C .
[Bring solution to a lower
temperature.]
[Replace electrode.]
pH
Calibration
UNDR 0.0 to 60.0°C
Offset @ 7.00pH:
mV>100mV;
Offset@6.86pH:
mV>91.7mV; New slope>
ideal slope by +30%
[Use a new buffer
solution.]
[Replace electrode.]
OVER 0.0 to 60.0°C
Offset @ 7.00pH:
mV< -100mV;
Offset@6.86pH:
mV<-108.7mV; New
slope<ideal slope by -30%
[Use a new buffer
solution.]
[Replace electrode.]