VWR pH110 Manual Del Usuario página 9

TROUBLESHOOTING
MAIN
DISPLAY
• pH electrode offset is greater/less than
Er 1
• STAND was pressed before the
• pH electrode is faulty
• pH electrode slope is off by more than
Er 2
• SLOPE was pressed before the
• Buffer 4.00, 4.01, 9.18 or 10.01 is not
Er 3 • Temperature is out of the 0.0 to 60.0 °C
• Measured pH is out of the 16.00/-2.00
OvEr/Undr
• Measured mV is out of the 1250/-2000
• Measured temperature is out of the
POSSIBLE CAUSE
+/-1.5 pH.
electrode and ATC/Temp probe settle to
within ±1.5 pH of the buffer value.
30% of ideal slope.
electrode and ATC/Temp probe settled
to within 30% of the buffer value.
correct.
range.
pH range.
mV range.
-10/120 °C range.
CORRECTIVE ACTION
• Replace the buffer and/or the
pH electrode. Press ESC.
• Allow sufficient time for the
electrode and ATC/Temp probe
to stabilize.
• Return for service.
• Check that the correct buffer is
used and that the electrode
slope is not off by more than
30% from the theoretical slope.
• Allow sufficient time for the
electrode and ATC/Temp probe
to stabilize.
• Replace the buffer and/or the
pH electrode. Press ESC.
• Return for service.
• Bring the buffer temperature
within range.
• Return for service.
• Bring the out of range unit into
the correct measuring range.
• If units are within proper range,
return product for service.
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