LAQUAtwin series (EC) Operation
3
CODE: GZ0000472457
Maintenance
Appendix
Frequently asked questions
Storage
1. Clean the sensor with tap water.
2. Dab gently with soft tissue or cloth to
remove moisture on the sensor and meter.
Note
Especially be sure to treat the sensor gently to
prevent damaging it.
3. Close the protection cover before storing
the meter.
Temperature sensor adjustment
Temperature sensor adjustment is available on
LAQUAtwin-EC-22 and LAQUAtwin-EC-33.
To perform accurate measurement with correc-
tion for temperature effects, follow the steps
below. Normally this is not necessary.
1. Ready a reference thermometer, and allow
the meter and reference thermometer to
reach to room temperature.
2. Set the display mode to temperature refer-
ring to "
Measurement display change"
(page 2).
3. Press the CAL switch.
The meter displays the setting screen for tar-
get temperature.
4. Press the MEAS switch to adjust the dis-
played temperature on the meter to match
the temperature indicated by the reference
thermometer.
Pressing the MEAS switch increases the dis-
played temperature. After the displayed tem-
perature reaches 40°C, it returns to 5°C.
5. Press the CAL switch again to apply the
displayed value to the adjustment.
The adjustment starts. The adjusted value
blinks with
and
displayed.
After the adjustment is complete, the adjusted
value stops blinking with MEAS and
dis-
played.
If Er4 (error display) appears, the adjustment
has failed. Retry the above steps increasing
the time spent on the step 1.
If the adjustment repeatedly fails, the sensor
may have deteriorated. Replace the sensor
with new one.
Initializing calibration data
Initialize calibration in the following cases.
To delete the calibration data
If the number of points for the last calibration is
uncertain.
After the sensor is replaced.
1. Press and hold the CAL and ON/OFF
switches for over 3 seconds when the
meter is switched OFF to Initialize calibra-
tion.
After a moment of all segment indication, the
software version is displayed.
And then, the display
changes as shown right.
2. Press the CAL switch.
All calibration data is reset.
When the initialization of cali-
bration data is complete, End
appears.
The meter automatically switches OFF.
Initializing the settings
All setup choices are erased. The meter is reset
to the factory default values.
1. Press and hold the MEAS, CAL and ON/OFF
switches for over 3 seconds when the
meter is switched OFF to enter the initial-
ization.
After a moment of all segment indication, the
software version is displayed.
And then, the display
changes as shown right.
2. Press the CAL switch.
All calibration data is reset.
When the initialization of set-
tings is complete, End
appears.
The meter automatically switches OFF.
Question
Answer
How can I
check the
sensor's con-
dition?
Perform 2-point calibration. If cali-
bration error occurs, the sensor has
deteriorated. Replace the sensor.
Can I mea-
sure high or
low tempera-
ture sam-
ples?
This meter cannot measure a sam-
ple with temperatures outside the
meter's operating temperature range
(5
C to 40
C).
The difference between the sample
temperature and ambient tempera-
ture increases the measurement
error. Perform measurement after
the sample reaches the ambient
temperature.
The mea-
sured value
does not
change after
changing the
sample.
If
lights steadily in AH mode, 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 dam-
aged. Replace the sensor.
“Or” or “Ur”
blinks in
value mea-
surement.
The measured value may be out of
the specified measurement range.
Measure a standard solution to
check, and if “Or” or “Ur” still blinks,
replace the sensor.
blinks
during mea-
surement.
The measured temperature is not
within the specified operating tem-
perature (5
C to 40
C).
If the ambient temperature is within
the specified range and
blinks,
replace the sensor.
The meter
does not
power ON.
Check that the batteries are inserted
properly. If the battery voltage is low,
replace them both with new ones at
the same time.
Er4 is dis-
played during
the calibra-
tion
Please note that if you press the
CAL switch in mV or temperature
display mode, Er4 is displayed. This
is because there is no calibration
facility available for these modes.
Er1 is dis-
played soon
power ON.
The internal IC in the meter may be
defective. Perform meter initializa-
tion.
If Er1 is still displayed after the initial-
ization, the internal IC in the meter is
defective. Replace the meter with a
new one (the meter cannot be
repaired).
Er2 is dis-
played right
after power
ON.
The internal IC in the meter is defec-
tive. Replace the meter with a new
one (the meter cannot be repaired).
Er3 is dis-
played right
after power
ON.
The internal IC in the meter is defec-
tive. Replace the meter with a new
one (the meter cannot be repaired).
Question
Answer
