Instruction Manual (Operation)
LAQUAtwin CA-11 / K-11 / NA-11 / NO3-11
Part Names
1. Sensor
2. Sensor cover
3. Liquid Junction
4. Membrane
5. Lithium batteries
6. MEAS key
7. ON/OFF key
8. CAL key
9. Waterproof gasket
10. Strap eyelet
Attach the sensor
1. Power OFF the meter
2. Confirm that the
waterproofing gasket is
clean and undamaged.
3. Slide the sensor onto the
meter, catch "A" on the meter should fit into hole
"a" on the sensor.
Be careful not to twist the waterproof gasket.
Detach the sensor
1. Power OFF the meter.
2. Lift the sensor tongue tip and
slide the sensor a little away from
the meter.
3. Pull out the sensor all the way
from the meter.
Insert batteries
1. Power OFF the meter.
2. Detach the sensor.
3. Slide both batteries into the battery
case as shown.
4. Attach the sensor.
Use 2x CR2032 batteries, place the
plus sides (+) upwards.
Remove batteries
1. Power OFF the meter.
2. Detach the sensor.
3. Use a ball-point pen or other tool
to pry the batteries out from the
clips.
4. Attach the sensor.
Electrode conditioning
• Perform electrode conditioning before using the
sensor for the first time or after several days of
disuse.
• Perform calibration after conditioning.
1. Power OFF the meter.
2. Place some drops of 2000 ppm standard solution
on the sensor.
3. Wait a few hours.
4. Dispose of the standard solution.
5. Rinse the sensor with DI or tap water.
Power on / off
1. Press ON/OFF key to switch the
meter on or off.
Keys must be pressed for 1 second to
function.
Settings menu
Customize the meter to the specific needs.
Operating keys functions
• MEAS: Select options in the menu.
• CAL : Confirm settings, go to next option.
• ON/OFF: Escape without saving.
Open settings menu
1. Power OFF the meter.
2. Simultaneously press and hold MEAS and
ON/OFF keys (approx. 3 seconds).
Set units of measurement
Unit options vary with different meter models.
3. Press MEAS to scroll
4. Press CAL to confirm and go to the next setting.
Set Low calibration point
Set the value to match the standard solution.
Value can be set from 5 to 990ppm.
5. Press MEAS to scroll. Keep pressed to increase
scrolling speed
6. Press CAL to confirm and go to the next setting
Set High calibration point
Set the value to match the standard solution.
Value can be set from 160 to 9990ppm.
7. Press MEAS to scroll. Keep pressed to increase
scrolling speed
8. Press CAL to confirm and go to the next setting
Stability mode
Choose A.S. (Auto Stable) or A.H. (Auto Hold)
A.S. mode: appears at stable value. If the value
changes disappears until new stability is reached
(continuous measurement)
A.H. mode: appears at stable value and holds it in
the display. Press MEAS to do another measurement.
9. Press MEAS to scroll.
10. Press CAL to confirm and go to the next setting.
Multiplying compensation
Apply compensation coefficient (0.01 to 9.90) to to the
measured value. The compensated result is displayed
as the measured value.
11. Press MEAS to scroll. Keep pressed to increase
scrolling speed
12. Press CAL to confirm and go to the next setting.
Backlight on / off
13. Press MEAS to scroll.
14. Press CAL to confirm and go to END. Meter will
shut down automatically.
Calibration
• Calibration is required before measurement.
• Use standard solutions within the measurement
range in the specifications.
• Calibration values are saved even if the meter is
switched OFF.
• Calibration value is rewritten if calibration is
repeated using the same standard solution.
• Calibrate with solutions close to the expected value.
1. Open the sensor cover.
2. Rinse the sensor with DI – or tap
water.
3. Dry the sensor with a tissue.
Rinse again with some of the next standard solution
for increased accuracy
4. Cover the complete sensor with
standard solution.
5. Close the sensor cover.
6. Switch on the meter.
7. Press CAL key. Set calibration
value blinks and is shown.
8. Press CAL to calibrate or MEAS to
select the other calibration point.
and blink.
After calibration complete, and
stop blinking and the measured
value is displayed.
The 1
st
point has now been calibrated.
9. Repeat step 1 to 8 for the 2
nd
calibration point.
Clear Calibration data
Clear calibration data in the following cases:
• If the number of previous calibration points is
uncertain
• After the sensor is replaced
• When Er4 persists
1. Power OFF the meter.
2. Simultaneously press and hold MEAS and CAL
keys (approx. 3 seconds).
3. Press CAL to confirm or ON/OFF to cancel
Temperature adjustment
Only available in A.S. Stability mode, see Setting
Menu. Normally this is not necessary. Adjust the
temperature only when the value is not correct.
1. Prepare a reference thermometer.
2. Allow the meter and thermometer to reach the
same temperature.
3. Make sure you are in A.S. mode
4. Press MEAS to view temperature
5. Press CAL, value blinks
6. Press MEAS to adjust the value to match the
thermometer.
Press CAL to confirm. and ºC will blink until
adjustment is done.
Backlight ON
(default)
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