Electro-Chemical Devices (ECD) L20 - Manual (Page 15)

Error Displays and troubleshooting
Main
Display
Possible Causes
Corrective
Actions
“Er1”
● “Stand” was pressed before
the electrode and ATC/Temp
probe settled to within +/-
1.5 pH of the buffer value.
●pH electrode offset is greater
/ less than +/-1.5 pH.
●pH electrode is faulty.
●Press “Clear” key, allow
sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Stand” key to start the
calibration procedure.
●Replace the buffer and /or
the pH electrode. Press
“Clear” key to recalibrate
meter.
●Replace electrode.
“Er2”
● “Slope” was pressed before
the electrode and
ATC/Temp probe settled to
within 30% of the buffer
value.
● Buffer 4.00, 4.01, 9.18 and
10.01 is not correct.
●pH electrode slope is off by
more than 30% of ideal
slope.
●Allow sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Slope” key to continue the
calibration procedure.
●Check if the correct buffer is
used.
●Replace the buffer and /or
the pH electrode. Press
“Clear” key to recalibrate
meter.
“Er3”
Temperature is out of the
0.0 to 60.0°C range.
Bring the buffer temperature
within range.
“Over”
Or
“Undr”
●Measured pH is out of the
2.00 to 16.00 pH range.
●Measured mV is out of the
1999 to 1999 mV range.
●Measured temperature is out
of the –10.0 to 120.0°C
range.
●Bring sample pH into the
correct measuring range.
●Bring sample ORP into the
correct measuring range.
●Bring sample temperature
into the correct measuring
range.
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