Hach-Lange SENSION+ EC71 - Manual (Page 14)

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 Calibrate again.
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 Calibrate again.
The standard temperature must be between 15 and
35 ºC.
Difference C > 30 % Calibrate again.
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 Calibrate again.
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.
sensION+ PH3 Lab pH-meter with accessories, without
probe
LPV2000.98.0002
sensION+ PH31 Lab pH-meter, GLP, with accessories,
without probe
LPV2100.98.0002
14 English