Troubleshooting - Hach sension ph31 User Manual

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
Asymmetry > Slope out of range (accepted values ± 58 mV).
58 mV Calibrate again.
Connect a new probe.
Buffer or electrode Calibrate again.
in poor conditions.
Examine the probe: Clean the probe (refer to
probe on page 13 for more information); make sure that
Sens. (a) < 70%
there are no air bubbles in the membrane. Shake the probe
like a thermometer; Connect a different probe to verify if
BUFFER NOT
problem is with probe or meter.
RECOGNIZED
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 new
buffer solution.
UNSTABLE Calibrate again.
READING
Examine the probe: Clean the probe (refer to
Time t> 100 s probe on page 13 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 verify if
problem is with probe or meter.
Make sure that the membrane and the diaphragm are
properly immersed in the sample.
16 English
Solution
Clean the
Clean the
Table 2 Calibration warnings and errors (continued)
Error/Warning
Electrode in poor Examine the probe: Clean the probe (refer to
conditions. probe on page 13 for more information); make sure that
there are no air bubbles in the membrane. Shake the probe
Check the
like a thermometer; connect a different probe to verify if
electrode
problem is with probe or meter.
SAME BUFFERS Calibrate again.
Examine the probe: Clean the probe (refer to
probe on page 13 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 verify if
problem is with probe or meter.
Examine the buffer solution: Use new buffer solution.
Table 3 Measurement warnings and errors
Error/Warning
pH 12.78 19°C Calibrate again
pH out of range Examine the probe: Clean the probe (refer to
probe on page 13 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
verify if problem is with probe or meter.
Temp out of range Examine the temperature sensor.
°C
Connect a different probe to verify if problem is with probe
or meter.
Time > 60 s Make sure that the membrane and the diaphragm are
properly immersed in the sample.
Time > 150 s
Examine the temperature.
Time > 300 s
Examine the probe: Clean the probe (refer to
probe on page 13 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
verify if problem is with probe or meter.
Solution
Clean the
Clean the
Solution
Clean the
Clean the