HACH LANGE sensION+ EC7, User Manual, Page: 11 / 268

Troubleshooting
Refer to the following table for common problem messages or
symptoms, possible causes and corrective actions.
Table 2 Calibration warnings and errors
Error/Warning Solution
UNSTABLE
READING
Time t> 100 s
Repeat with .
Examine the probe: Make sure that the probe is
properly immersed in the sample; make sure that there
are no air bubbles inside the probe measuring
chamber; rinse the probe with ethanol.
Check temperature.
Check the cell. Make sure the standard temperature is constant during
the calibration.
Examine the probe: Make sure that the probe is properly
immersed in the sample; make sure that there are no air
bubbles inside the probe measuring chamber; rinse the
probe with ethanol.
STANDARD
TEMPERATURE
< 15 °C or > 35 °C
Repeat with .
The standard temperature must be between 15 and
35 ºC.
Difference C > 30 %
Repeat with .
Examine the probe: Make sure that the probe is
properly immersed in the sample; make sure that there
are no air bubbles inside the probe measuring
chamber; rinse the probe with ethanol; connect a
different probe to verify if problem is with probe or
meter.
Examine the standard solution: Use new standard
solution.
C < 0.05 or > C >
50.00 °C
SAME BUFFERS
Buffer or cell in poor
conditions
BUFFER NOT
RECOGNIZED
Difference C > 30 %
SAME STANDARDS
Table 3 Measurement warnings and errors
Error/Warning Solution
23.2 °C
728 µS/cm @ 25 °C
Repeat with .
EC out of range Examine the probe: Make sure that the probe is
properly immersed in the sample; make sure that
there are no air bubbles inside the probe measuring
chamber; rinse the probe with ethanol; connect a
different probe to verify if problem is with probe or
meter.
Out of range °C Examine the temperature sensor.
Connect a different probe to verify if problem is with
probe or meter.
TC = 0
Impossible to measure
salinity Modify TC
Time > 150 s Examine the temperature.
Examine the probe: Make sure that the probe is
properly immersed in the sample; make sure that
there are no air bubbles inside the probe measuring
chamber; rinse the probe with ethanol; connect a
different probe to verify if problem is with probe or
meter.
Replacement parts and accessories
Note: Product and Article numbers may vary for some selling regions. Contact the
appropriate distributor or refer to the company website for contact information.
Replacement parts
Description Item no.
PH3 Lab pH-meter with accessories, without
probe
LPV2000.98.0002
PH31 Lab pH-meter, GLP, with accessories,
without probe
LPV2100.98.0002
English 11