horiba LaquaTwin B-771, Instruction Manual

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8 Appendix
8.1 Frequently asked questions
Question Answer
How long is the
sensor's service
life?
It depends on measurement samples and conditions.
It should be approx. 1500 measurements for typical samples.
Note that sensor deterioration and failure are not included in
the warranty.
How can I check the
sensor's condition?
Measure the provided standard solution to check how much
the measured conductivity value drifts from the specified
conductivity. If the measured value drifts, perform calibration.
What shall I do if
calibration is failed?
Dirt in the measurement cell and electrode is the main cause of
calibration failure. Perform electrode surface treatment (refer
to page 8). If calibration is still failed after this, replace the sen-
sor.
Are there any helpful
tips or precautions
to be aware for
measurement?
Ambient air may cause the measured values to fluctuate.
To reduce environment interference, close the protection
cover.
When the sample amount is enough, washing the sensor twice
or so with the sample allows more accurate measurement.
Residue between the protection cover and flat sensor prevents
accurate measurement. Before measurement of the next
sample, clean the sensor with tap water and remove moisture.
Can I measure high-
or low-temperature
samples?
This product can not measure a sample with a temperature
outside the meter's operating temperature range (5
q
C to 40
q
C).
The difference between the sample temperature and ambient
temperature increases the measurement error. Perform mea-
surement after the sample reaches the ambient temperature.
Can I prepare the
moistening solution
myself?
You can prepare the moistening solution by mixing neutral
detergent with 20 times to 100 times as much water.
The measured value
does not change
after changing the
sample.
If lights steadily, the measured value is locked.
Press the MEAS switch to unlock the value.
If the value does not change after unlocking, the sensor may
be damaged. Replace the sensor.
The temperature
alarm icon blinks
during
measurement. The measuring environment temperature may not meet the
specified operating temperature (5
q
C to 40
q
C).
When the environment temperature is within the specified
range and the alarm icon blinks, replace the sensor.