Hach-Lange SENSION+, Portable Meter, LPG2500 User Manual
Page 14
Error/Warning
Description
Solution
Measurement out
of range.
• Insert the probe into the appropriate
standard and read again.
• Clean the probe and the membrane.
• Make sure that there are no air
bubbles in the membrane.
• Disconnect the probe and then
connect the probe again.
• Connect a different probe to verify if
problem is with probe or meter.
Battery is low.
Insert new batteries.
E1
Unstable reading
during a stability
measurement or
during calibration.
Make sure that the probe is properly
immersed in the sample.
E2
Probe current:
exceeded upper
limit during
measurement ≥
250 nA.
• Clean the probe and the membrane.
• Make sure that there are no air
bubbles in the membrane.
• Disconnect the probe and then
connect the probe again.
• Connect a different probe to verify if
problem is with probe or meter.
E2
pH probes
sensitivity out of
range (accepted
values 70–105%).
• Make sure that the correct probe is
connected to the meter.
• Connect a new probe.
Error/Warning
Description
Solution
E2
During calibration,
the difference
between the
constants gets >
30%.
• Insert the probe into the appropriate
standard and read again.
• Clean the probe and the membrane.
• Make sure that there are no air
bubbles in the membrane.
• Disconnect the probe and then
connect the probe again.
• Connect a different probe to verify if
problem is with probe or meter.
• Connect a new probe.
E3
During calibration,
the cell constant
gets < 0.05 cm
-1
.
• Insert the probe into the appropriate
standard and read again.
• Clean the probe and the membrane.
• Make sure that there are no air
bubbles in the membrane.
• Disconnect the probe and then
connect the probe again.
• Connect a different probe to verify if
problem is with probe or meter.
E3
Slope out of range
(accepted values ±
58 mV).
Connect a new probe.
E4
Buffer solution not
recognized.
• Clean the probe and the membrane.
• Make sure that there are no air
bubbles in the membrane.
• Disconnect the probe and then
connect the probe again.
• Connect a different probe to verify if
problem is with probe or meter.
• Make sure that the buffer used
matches the buffer specified in
configuration.
• Replace the buffer solution.
• Make sure of the temperature
specification in configuration.
14 English