Hach sensION+ MM340 Manuel D'utilisation page 16

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Section 10 Troubleshooting
Refer to the following table for common problem messages or
symptoms, possible causes and corrective actions.
Table 1 Calibration warnings and errors
Error/Warning
Calibration out of
Measured value out of range.
range
Calibrate again. Connect a new probe.
Unknown buffer
Calibrate again.
Examine the probe: Clean the probe (refer to
Same buffer /
probe
on page 14 for more information); make sure that
standard. Re-
there are no air bubbles in the membrane. Shake the
calibrate
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Examine the buffer solution: Make sure that the buffer
used matches the buffer specified in configuration; make
sure of the temperature specification in configuration; use
a new buffer solution.
Unstable
Calibrate again.
measurement
Examine the probe: Clean the probe (refer to
Time > 100 s (pH,
probe
on page 14 for more information); make sure that
EC and DO
there are no air bubbles in the membrane. Shake the
calibrations)
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Time > 240 s (ISE
calibrations)
Make sure that the membrane and the diaphragm are
properly immersed in the sample.
Temperature
Adjust the calibration solutions to the same temperature.
difference > 3.0 ºC
Examine the temperature sensor.
Temperature out of
Examine the temperature sensor.
range
Connect a new probe.
16 English
Solution
Clean the
Clean the
Table 1 Calibration warnings and errors (continued)
Error/Warning
Outside allowable
Offset or Slope outside the range.
range
Examine the buffer solution: Make sure that the buffer
used matches the buffer specified in configuration; make
sure of the temperature specification in configuration; use
a new buffer solution.
Examine the probe: Clean the probe (refer to
probe
on page 14 for more information); make sure that
there are no air bubbles in the membrane. Shake the
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Signal too low / high
DO probe error.
(DO calibrations)
Examine the probe. Connect a different probe to make
sure that if problem is with probe or meter.
Use a new standard solution.
Cell constant over
Insert the probe into the appropriate standard and re-
limits (EC
read.
calibrations)
Examine the probe: Clean the probe (refer to
probe
on page 14 for more information); make sure that
Cell constant
there are no air bubbles in the membrane. Shake the
deviation error (EC
probe like a thermometer; connect a different probe to
calibrations)
find if the problem is with the probe or the meter.
Not calibrated
There are no calibration data stored in the instrument.
Perform calibration.
Solution
Clean the
Clean the

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