26
ERROR DISPLAYS AND TROUBLESHOOTING IN
pH/ORP MODE
Main
Display
Possible cause(s)
Corrective Action(s)
"Er1"
1.
“Stand/Cal”
was pressed
before the electrode and
ATC/Temp probe settled to
/-1.00 pH of the
buffer value.
2. pH electrode offset is
greater/less than +/-1.00
pH.
3. pH electrode is faulty.
1.Press
“Clear”
key. Allow
sufficient time for the
electrode and ATC/Temp
probe to stabilize. Re-press
“Stand/Cal”
key to start the
calibration procedure.
2.Replace the buffer and/or
the pH electrode. Press
“Clear”
key to recalibrate
meter.
3. Replace electrode.
"Er2"
1.
“Slope/Enter”
was
pressed before the
electrode and ATC/Temp
probe settled to within 30%
of the buffer value.
2. Buffer 1.68, 4.00, 4.01,
9.18, 10.01 and 12.46 pH
is not correct.
3. pH electrode slope is off by
more than 30% of ideal
slope.
1. Allow sufficient time for the
electrode and ATC/Temp
probe to stabilize. Re-press
“Slope/Enter” key to
continue the calibration
procedure.
2.Check if the correct buffer is
used.
3.Replace the buffer and/or
the pH electrode. Press
“Clear” key to recalibrate
meter.
"Er3"
In pH calibration mode
temperature is out of the
0.0 to 60.0 °C range.
Bring the pH buffer
temperature within range.
"over"
/ ”undr”
1. Measured pH is out of the
-2.00 to 16.00 pH range.
2. Measured mV (RmV) is out
of the –1999.9 to 1999.9
mV range.
3. Measured temperature is
out of the -10.0 to 120.0 °C
range.
1.Bring sample pH into
the correct measuring range.
2.Bring sample ORP into the
correct measuring range.
3.Bring sample temperature
into the correct measuring
range.
