Hach sensION+ pH3, 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

Solution

Asymmetry >
58 mV

Slope out of range (accepted values ± 58 mV).
Repeat with 

.

Connect a new probe.

Buffer or electrode
in poor conditions.

Repeat with 

.

Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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: Make sure that the buffer
used matches the buffer specified in configuration; make
sure of the temperature specification in configuration; use
new buffer solution.

Sens. (a) < 70%

BUFFER NOT
RECOGNIZED

UNSTABLE
READING
Time t> 100 s

Repeat with 

.

Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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.

Table 2  Calibration warnings and errors (continued)

Error/Warning

Solution

Electrode in poor
conditions.

Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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.

Check the
electrode

SAME BUFFERS

Repeat with 

.

Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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

Solution

pH 12.78 19°C

Repeat with 

.

pH out of range

Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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 °C Examine the temperature sensor.

Connect a different probe to verify if problem is with
probe or meter.

Time > 150 s

Make sure that the membrane and the diaphragm are
properly immersed in the sample.
Examine the temperature.
Examine the probe: Clean the probe (refer to

 Clean the

probe

 on page 9 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.

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