Horiba Scientific LAQUAtwin B-74 Series Manual page 75

Question
Can I measure high-
or low-temperature
samples?
Can I prepare
standard solutions
myself?
The measured value
does not change
after changing the
sample.
The temperature
alarm icon blinks
during
measurement.
The power is not
turned ON.
Er1 is displayed
right after power
ON.
Er2 is displayed
right after power
ON.
Er3 is displayed
right after power
ON.
This product cannot measure a sample with a temperature
outside the meter's operating temperature range (5C to 40C).
The difference between the sample temperature and ambient
temperature increases the measurement error. Perform mea-
surement after the sample reaches the ambient temperature.
For B-741 (for crop measurement) and B-742 (for soil
measurement), use the dedicated standard solutions (30 ppm,
300 ppm, or 5000 ppm) that are adjusted in conductivity by
materials other than potassium nitrate.
For B-743 (for general measurement), you can prepare
standard solutions by dissolving potassium nitrate in ion-
exchanged water to the specified concentration.
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 measuring environment temperature may not meet the
specified operating temperature (5C to 40C).
When the environment temperature is within the specified
range and the alarm icon blinks, replace the sensor.
Check that the batteries are inserted properly. If the batteries
are low, replace them both with new ones at the same time.
The internal IC in the meter may defect.
After Er1 is displayed, the meter enters the initialization mode
automatically and Init and
over 2 seconds to execute initialization, and then turn OFF and
ON again (refer to page 27).
If Er1 is still displayed after the initialization, the internal IC in
the meter defects. Replace the product with new one (the
meter cannot be repaired).
The internal IC in the meter defects. Replace the product with
new one (the meter cannot be repaired).
The internal IC in the meter defects. Replace the product with
new one (the meter cannot be repaired).
Answer
appear. Press the CAL switch for
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