horiba B-711, Инструкция по эксплуатации

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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?
For B-712 and B-713, perform two-point calibration. If
calibration error occurs, the sensor is deteriorated. Replace the
sensor.
For B-711, measure the pH 4.01 standard solution (part No.
3200457726) sold seperately after calibration, and check how
much the measured pH value drifts from the specified pH. if the
measured value drifts, the sensor is deteriorated. Replace the
sensor.
Are there any helpful
tips or precautions
to be aware for
measurement?
Use the light shield cover to avoid direct sunlight during
measurement because the sensor is affected by light.
When the sample amount is enough, washing the sensor twice
or so with the sample allows more accurate measurement.
Residue between the light shield cover and flat sensor pre-
vents 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.
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.
“0.0” blinks in pH
measurement.
The measured pH may be out of the specified measurement
range (2 pH to12 pH). Measure a standard solution to check,
and if “0.0” blinks even then, 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.